/* =====================================================
   Portable English — Dark Design System
   ===================================================== */

/* --- Design tokens --- */
:root {
  /* Backgrounds
     --bg        = card / surface colour (#1a1d27)
     body bg     = #0f1117 (set directly on body below)
  */
  --bg: #1a1d27;
  --bg-subtle: #242837;
  --bg-muted: #2e3347;

  /* Text */
  --fg: #eeecea;
  --fg-muted: #d1d5db;
  --fg-subtle: #6b7280;

  /* Borders */
  --border: #2e3347;
  --border-muted: #242837;

  /* Accent */
  --amber: #e8c547;

  /* Status */
  --green: #34d399;
  --green-bg: rgba(52,211,153,0.12);
  --red: #f87171;
  --red-bg: rgba(248,113,113,0.12);

  /* --- Legacy aliases (inline JS uses these) --- */
  --white: #1a1d27;
  --grey-dk-000: #c8d0e0;
  --grey-dk-100: #6b7280;
  --grey-dk-200: #4e5470;
  --grey-dk-250: #3a3f5c;
  --grey-dk-300: #2e3347;
  --grey-lt-000: #242837;
  --grey-lt-100: #2e3347;
  --grey-lt-200: #3a3f5c;
  --grey-lt-300: #4e5470;
  --purple-000: #e8c547;
  --purple-100: #d4a827;
  --purple-200: #b88f1a;
  --green-100: #34d399;
  --red-100: #f87171;
  --yellow-200: #e8c547;
  --body-bg: #0f1117;
  --body-text: #d1d5db;
  --heading-color: #eeecea;
  --link-color: #e8c547;
  --border-color: #2e3347;
  --sidebar-bg: #1a1d27;
  --feedback-color: #242837;
  --base-btn-color: #242837;
  --btn-primary-color: #e8c547;

  /* Fonts */
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'DM Mono', 'SFMono-Regular', Menlo, Consolas, monospace;

  /* Font scale */
  --fs-1: 0.6875rem;
  --fs-2: 0.75rem;
  --fs-3: 0.8125rem;
  --fs-4: 0.875rem;
  --fs-5: 1rem;
  --fs-6: 1.125rem;
  --fs-7: 1.5rem;
  --fs-8: 2rem;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 2.5rem;
  --sp-8: 3rem;
  --sp-9: 3.5rem;
  --sp-10: 4rem;

  /* Radius */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --border-radius: 10px;

  /* Shadows — deeper for dark backgrounds */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow: 0 1px 4px rgba(0,0,0,0.5), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.6), 0 1px 4px rgba(0,0,0,0.4);

  /* Nav height */
  --nav-h: 60px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--fs-4);
  line-height: 1.6;
  color: var(--fg);
  background: #0f1117;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--fg);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5em;
}
h1 { font-size: var(--fs-8); font-weight: 700; }
h2 { font-size: var(--fs-7); font-weight: 600; }
h3 { font-size: var(--fs-6); font-weight: 600; }
h4 { font-size: var(--fs-5); font-weight: 600; }
h5 { font-size: var(--fs-4); font-weight: 600; }
h6 { font-size: var(--fs-3); font-weight: 600; }

p { margin-bottom: 1em; }
p:first-child { margin-top: 0; }
p:last-child { margin-bottom: 0; }

a { color: var(--fg); text-decoration: none; }
a:hover { opacity: 0.75; }
a:not([class]) {
  color: var(--amber);
  text-decoration: underline;
  text-decoration-color: rgba(232,197,71,0.3);
  text-underline-offset: 2px;
}
a:not([class]):hover { text-decoration-color: var(--amber); opacity: 1; }

code {
  font-family: var(--font-mono);
  font-size: 0.8em;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.3em;
}

img { max-width: 100%; height: auto; display: block; }
hr { border: none; border-top: 1px solid var(--border); margin: var(--sp-6) 0; }
ul, ol { padding-left: 1.5em; }
li { margin: 0.25em 0; }

blockquote {
  margin: var(--sp-4) 0;
  padding-left: var(--sp-4);
  border-left: 3px solid var(--border);
  color: var(--fg-muted);
}

/* =====================================================
   TOP NAV
   ===================================================== */

.top-nav, #top-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: rgba(15,17,23,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  display: flex;
  align-items: center;
}

.top-nav-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 0 var(--sp-5);
  gap: var(--sp-4);
}

.top-nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.top-nav-logo:hover { opacity: 0.75; }

.top-nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex: 1;
}

.top-nav-link {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  text-decoration: none;
  padding: 0.3em 0.7em;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.top-nav-link:hover { color: var(--fg); background: var(--bg-subtle); opacity: 1; }
.top-nav-link.active { color: var(--amber); font-weight: 500; background: rgba(232,197,71,0.08); }

.top-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

.top-nav-user {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  white-space: nowrap;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Nav dropdown (My Books) */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-trigger {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: var(--fs-4);
  color: var(--fg-muted);
  padding: 0.3em 0.7em;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  display: flex;
  align-items: center;
  gap: 0.3em;
}
.nav-dropdown-trigger:hover,
.nav-dropdown.open .nav-dropdown-trigger { color: var(--fg); background: var(--bg-subtle); }
.nav-dropdown-trigger.active { color: var(--amber); font-weight: 500; background: rgba(232,197,71,0.08); }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 188px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  z-index: 201;
  padding: 6px 0 var(--sp-1);
}
.nav-dropdown.open .nav-dropdown-menu { display: block; }
@media (hover: hover) {
  .nav-dropdown:hover .nav-dropdown-menu { display: block; }
}
.nav-dropdown-item {
  display: block;
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-4);
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.12s, background 0.12s;
}
.nav-dropdown-item:hover { color: var(--fg); background: var(--bg-subtle); }

/* Mobile nav */
.top-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  color: var(--fg);
  font-size: 1.2rem;
  margin-left: auto;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .top-nav-toggle { display: flex; align-items: center; }
  .top-nav-links { display: none; }
  .top-nav-actions { display: none; }
  .top-nav-links.nav-open {
    display: flex;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: #1a1d27;
    border-bottom: 1px solid var(--border);
    padding: var(--sp-4) var(--sp-5);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-1);
    box-shadow: var(--shadow);
    z-index: 199;
  }
  .top-nav-actions.nav-open {
    display: flex;
    position: fixed;
    top: calc(var(--nav-h) + 8px);
    right: 0; left: 0;
    background: #1a1d27;
    padding: 0 var(--sp-5) var(--sp-4);
    flex-direction: column;
    align-items: flex-start;
    z-index: 199;
    gap: var(--sp-2);
  }
  /* Dropdown behaves inline on mobile */
  .nav-dropdown { width: 100%; }
  .nav-dropdown-trigger { width: 100%; justify-content: space-between; }
  .nav-dropdown.open .nav-dropdown-menu {
    display: block;
    position: static;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0;
  }
  .nav-dropdown.open .nav-dropdown-item { padding-left: var(--sp-5); }
}

/* =====================================================
   PAGE LAYOUT
   ===================================================== */

.page-wrapper {
  padding-top: calc(var(--nav-h) + var(--sp-4));
  min-height: 100vh;
}

.page-content {
  max-width: 860px;
  margin: 0 auto;
  padding: var(--sp-8) var(--sp-5);
}

.page-content-wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--sp-8) var(--sp-5);
}

/* =====================================================
   BUTTONS
   ===================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.5em 1.1em;
  font-family: var(--font-body);
  font-size: var(--fs-4);
  font-weight: 500;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  color: var(--fg);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
  appearance: none;
  vertical-align: middle;
}
.btn:hover { background: var(--bg-muted); border-color: var(--fg-subtle); opacity: 1; text-decoration: none; }
.btn:active { background: var(--bg-muted); }
.btn[disabled], .btn.disabled { opacity: 0.4; pointer-events: none; }

.btn-primary {
  background: var(--amber);
  color: #0f1117 !important;
  border-color: var(--amber);
}
.btn-primary:hover { background: #d4a827; border-color: #d4a827; }
.btn-primary:active { background: #c49520; }

.btn-outline {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn-outline:hover { background: var(--bg-subtle); border-color: var(--fg-subtle); }

.btn-sm {
  padding: 0.3em 0.8em;
  font-size: var(--fs-3);
}

/* =====================================================
   FORMS
   ===================================================== */

.form-group { margin-bottom: var(--sp-4); }

.form-label {
  display: block;
  font-size: var(--fs-3);
  font-weight: 500;
  color: var(--fg);
  margin-bottom: var(--sp-1);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem; /* 16px minimum prevents iOS auto-zoom on input focus */
  padding: 0.55em 0.9em;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--fg);
  line-height: 1.5;
  appearance: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-select {
  padding-right: 2.2em;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M1.4 0L6 4.6 10.6 0 12 1.4l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75em center;
  background-size: 12px 8px;
  cursor: pointer;
}
.form-input::placeholder,
.form-textarea::placeholder { color: var(--fg-subtle); }
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(232,197,71,0.12);
}
.form-textarea { resize: vertical; min-height: 80px; }

/* =====================================================
   LABELS / BADGES
   ===================================================== */

.label {
  display: inline-block;
  padding: 0.15em 0.55em;
  font-size: var(--fs-2);
  font-weight: 600;
  border-radius: var(--radius-sm);
  line-height: 1.5;
  vertical-align: middle;
  letter-spacing: 0.01em;
}
.label-purple { background: var(--amber); color: #0f1117; }
.label-green  { background: rgba(52,211,153,0.15); color: var(--green); border: 1px solid rgba(52,211,153,0.25); }
.label-grey   { background: var(--bg-subtle); color: var(--fg-muted); border: 1px solid var(--border); }
.label-yellow { background: rgba(232,197,71,0.15); color: var(--amber); }
.label-blue   { background: rgba(96,165,250,0.15); color: #60a5fa; }

/* =====================================================
   COMPREHENSION QUESTIONS
   ===================================================== */
.comp-questions { display: flex; flex-direction: column; gap: 1.25rem; }
.comp-q { display: flex; gap: 1rem; }
.comp-q-num { width: 28px; height: 28px; border-radius: 50%; background: var(--bg-subtle); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-size: var(--fs-3); font-weight: 700; color: var(--fg-muted); flex-shrink: 0; margin-top: 2px; }
.comp-q-body { flex: 1; }
.comp-q-text { font-size: var(--fs-4); font-weight: 600; margin: 0 0 0.75rem; line-height: 1.5; }
.comp-options { display: flex; flex-direction: column; gap: 0.4rem; }
.comp-option { text-align: left; padding: 0.6rem 0.9rem; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-subtle); color: var(--fg); font-size: var(--fs-3); cursor: pointer; transition: border-color 0.15s, background 0.15s; }
.comp-option:hover:not(:disabled) { border-color: var(--amber); background: rgba(232,197,71,0.06); }
.comp-option:disabled { cursor: default; opacity: 0.7; }
.comp-option--correct { border-color: var(--green) !important; background: rgba(52,211,153,0.12) !important; color: var(--green) !important; opacity: 1 !important; font-weight: 600; }
.comp-option--wrong { border-color: #f87171 !important; background: rgba(248,113,113,0.12) !important; color: #f87171 !important; opacity: 1 !important; }
.comp-feedback { font-size: var(--fs-3); padding: 0.5rem 0.75rem; border-radius: 6px; margin-top: 0.5rem; }
.comp-feedback--correct { background: rgba(52,211,153,0.1); color: var(--green); }
.comp-feedback--wrong { background: rgba(248,113,113,0.08); color: #f87171; }
.comp-score { margin-top: 1.5rem; text-align: center; }
.comp-score-inner { display: inline-flex; align-items: center; gap: 0.75rem; background: var(--bg-subtle); border: 1px solid var(--border); border-radius: 10px; padding: 0.75rem 1.5rem; }
.comp-score-label { font-size: var(--fs-3); color: var(--fg-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.comp-score-value { font-size: var(--fs-6); font-weight: 800; color: var(--amber); }

/* =====================================================
   CARDS / CALLOUTS
   ===================================================== */

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-5);
  margin-bottom: var(--sp-5);
}

.callout {
  padding: var(--sp-4) var(--sp-5);
  margin: var(--sp-4) 0;
  border-radius: var(--radius-sm);
  border-left: 3px solid;
  font-size: var(--fs-4);
}
.callout-info  { border-color: var(--amber); background: rgba(232,197,71,0.06); }
.callout-note  { border-color: var(--amber); background: rgba(232,197,71,0.06); }
.callout-warn  { border-color: var(--red); background: var(--red-bg); }
.callout-green { border-color: var(--green); background: var(--green-bg); }
.callout-title {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: var(--sp-2);
}

/* =====================================================
   ALERTS
   ===================================================== */

.alert {
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  font-size: var(--fs-4);
  margin-bottom: var(--sp-4);
  border: 1px solid;
}
.alert-success { background: var(--green-bg); border-color: var(--green); color: var(--green); }
.alert-error   { background: var(--red-bg); border-color: var(--red); color: var(--red); }
.alert-warning { background: #2d2200; border-color: var(--amber); color: var(--amber); }

/* =====================================================
   TABLES
   ===================================================== */

.table-wrapper { overflow-x: auto; margin: var(--sp-4) 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-4);
}
th {
  text-align: left;
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 2px solid var(--border);
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  background: var(--bg-subtle);
}
td {
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-subtle); }

/* =====================================================
   PROGRESS BAR
   ===================================================== */

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-subtle);
  border-radius: 2px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--amber);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* =====================================================
   SPINNER
   ===================================================== */

.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--amber);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* =====================================================
   AUDIO BUTTON
   ===================================================== */

.audio-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px; min-height: 44px;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  cursor: pointer;
  color: var(--fg);
  font-size: 0.85rem;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}
.audio-btn:hover { background: var(--bg-muted); }
.audio-btn--playing {
  background: var(--amber);
  color: #0f1117;
  border-color: var(--amber);
  animation: pulse 1.2s ease-in-out infinite;
}
.audio-btn--loading { pointer-events: none; opacity: 0.6; }
.audio-btn--error {
  font-size: var(--fs-2);
  width: auto;
  padding: 0 var(--sp-2);
  color: var(--fg-muted);
  pointer-events: none;
}
.audio-btn--lg { width: 44px; height: 44px; font-size: 1rem; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.06)} }

/* Large labeled listen button for flashcard backs */
.audio-btn-listen {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 44px;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  cursor: pointer;
  color: var(--fg);
  font-size: var(--fs-4);
  font-family: var(--font-body);
  transition: filter 0.15s;
}
.audio-btn-listen:hover { filter: brightness(1.1); }



/* =====================================================
   TOAST
   ===================================================== */

@keyframes slideIn { from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:translateY(0)} }

/* =====================================================
   GATE OVERLAY
   ===================================================== */

.gate-wrapper { position: relative; }
.gate-wrapper .gate-content {
  filter: blur(4px);
  pointer-events: none;
  user-select: none;
}
.gate-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(15,17,23,0.94);
  z-index: 10;
  border-radius: var(--radius);
  text-align: center;
  padding: var(--sp-6);
}
.gate-overlay h3 { margin-bottom: var(--sp-2); }
.gate-overlay p {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  margin-bottom: var(--sp-5);
  max-width: 320px;
}

/* =====================================================
   CONTEXT TEXT HIGHLIGHTS
   ===================================================== */

.context-text mark[data-word] {
  background: rgba(232,197,71,0.12);
  color: var(--amber);
  border-bottom: 2px solid var(--amber);
  cursor: pointer;
  padding: 0 1px;
  font-style: normal;
  border-radius: 2px;
  transition: background 0.1s;
}
.context-text mark[data-word]:hover {
  background: var(--amber);
  color: #0f1117;
}

/* =====================================================
   QUIZ OPTIONS
   ===================================================== */

.quiz-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--sp-2) var(--sp-3);
  margin-bottom: var(--sp-2);
  font-family: var(--font-body);
  font-size: var(--fs-4);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--fg);
  transition: border-color 0.15s, background 0.15s;
}
.quiz-option:hover { border-color: var(--amber); background: rgba(232,197,71,0.06); }
.quiz-option--correct { border-color: var(--green) !important; background: var(--green-bg) !important; color: var(--green); }
.quiz-option--wrong   { border-color: var(--red) !important; background: var(--red-bg) !important; color: var(--red); }
.quiz-option--disabled { pointer-events: none; }

/* =====================================================
   WORD SIDE PANEL
   ===================================================== */

.word-panel {
  position: fixed;
  top: 0; right: -440px;
  width: 440px; max-width: 95vw;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 500;
  overflow-y: auto;
  transition: right 0.28s ease;
  padding: var(--sp-6) var(--sp-5);
}
.word-panel--open { right: 0; }

.word-panel-close {
  position: absolute;
  top: var(--sp-4); right: var(--sp-4);
  background: none; border: none;
  font-size: 1rem;
  cursor: pointer;
  color: var(--fg-muted);
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
}
.word-panel-close:hover { background: var(--bg-subtle); color: var(--fg); }

.word-panel-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 499;
  display: none;
}
.word-panel-overlay--visible { display: block; }

/* =====================================================
   AUTH PAGES
   ===================================================== */

.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + var(--sp-4)) var(--sp-4) var(--sp-6);
  background: #0f1117;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-7);
  box-shadow: var(--shadow);
}
.auth-card h1 {
  font-size: var(--fs-7);
  font-weight: 700;
  margin-bottom: var(--sp-1);
}
.auth-card .auth-sub {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  margin-bottom: var(--sp-6);
}

.auth-logo {
  display: flex;
  justify-content: center;
  text-decoration: none;
  margin-bottom: var(--sp-6);
}
.auth-logo:hover { opacity: 0.75; }

.auth-footer {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  text-align: center;
  margin-top: var(--sp-5);
}

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  width: 100%;
  padding: 0.6em 1em;
  background: #fff;
  color: #1f1f1f;
  border: 1px solid #dadce0;
  border-radius: var(--radius-sm);
  font-size: var(--fs-4);
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s;
  margin-bottom: var(--sp-5);
  box-sizing: border-box;
}
.btn-google:hover { background: #f8f9fa; box-shadow: 0 1px 3px rgba(0,0,0,0.12); opacity: 1; }
.btn-google svg { flex-shrink: 0; }

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin: 0 0 var(--sp-5);
  color: var(--fg-subtle);
  font-size: var(--fs-2);
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* =====================================================
   DASHBOARD STAT CARDS
   ===================================================== */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}
.stat-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4);
}
.stat-box-num {
  font-size: var(--fs-8);
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  margin-bottom: var(--sp-1);
}
.stat-box-label {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  font-weight: 500;
}

/* =====================================================
   LESSON LIST
   ===================================================== */

.lesson-list { margin: 0; padding: 0; list-style: none; }
.lesson-list-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--border);
}
.lesson-list-item:last-child { border-bottom: none; }
.lesson-list-item a { text-decoration: none; color: var(--fg); font-weight: 500; }
.lesson-list-item a:hover { opacity: 0.75; }
.lesson-list-meta {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  margin-top: var(--sp-1);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

/* =====================================================
   LESSON / LIBRARY CARDS
   ===================================================== */

.chip {
  font-size: var(--fs-3);
  padding: var(--sp-1) var(--sp-3);
  border-radius: 50px;
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  cursor: pointer;
  transition: all 0.15s;
  text-transform: capitalize;
  color: var(--fg-muted);
  white-space: nowrap;
}
.chip.active { background: var(--amber); color: #0f1117; border-color: var(--amber); }
.chip:hover:not(.active) { background: var(--bg-muted); color: var(--fg); }

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-4);
}
.lesson-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s, border-color 0.15s;
  text-decoration: none;
  color: inherit;
}
.lesson-card:hover { box-shadow: var(--shadow); border-color: var(--amber); }
.lesson-card-body { padding: var(--sp-4); flex: 1; }
.lesson-card-meta { display: flex; gap: var(--sp-2); margin-bottom: var(--sp-3); flex-wrap: wrap; }
.lesson-card-title { font-size: var(--fs-5); font-weight: 600; color: var(--fg); margin-bottom: var(--sp-2); }
.lesson-card-time { font-size: var(--fs-3); color: var(--fg-muted); }
.lesson-card-foot {
  padding: var(--sp-3) var(--sp-4);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.locked-notice { font-size: var(--fs-3); color: var(--fg-muted); display: flex; align-items: center; gap: var(--sp-1); }

/* =====================================================
   PRICING
   ===================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
  margin: var(--sp-6) 0;
}
.pricing-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.pricing-card--featured { border: 2px solid #e8c547; box-shadow: var(--shadow), 0 0 20px rgba(232,197,71,0.15); }
.pricing-card__head { padding: var(--sp-5); border-bottom: 1px solid var(--border); }
.pricing-card--featured .pricing-card__head { background: rgba(232,197,71,0.08); border-color: var(--border); }
.pricing-card__name {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 var(--sp-2);
  color: var(--fg-muted);
}
.pricing-card--featured .pricing-card__name { color: var(--amber); }
.pricing-card__price { font-size: var(--fs-8); font-weight: 700; color: var(--fg); line-height: 1; }
.pricing-card__period { font-size: var(--fs-3); color: var(--fg-muted); margin-top: var(--sp-1); }
.pricing-card__body { padding: var(--sp-4) var(--sp-5); flex: 1; }
.pricing-card__body ul { list-style: none; padding: 0; }
.pricing-card__body li {
  font-size: var(--fs-4);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: var(--sp-2);
}
.pricing-card__body li:last-child { border-bottom: none; }
.li-yes { color: #4ade80; flex-shrink: 0; }
.li-no  { color: #f87171; flex-shrink: 0; }
.li-no-item { opacity: 0.6; }
.pricing-card__foot { padding: var(--sp-4) var(--sp-5) var(--sp-5); }

/* Pricing page standalone cards */
.cards-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
  max-width: 620px;
  margin: 0 auto var(--sp-8);
}
.p-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.p-card-featured { border: 2px solid #e8c547; box-shadow: var(--shadow), 0 0 20px rgba(232,197,71,0.15); }
.p-card-ribbon {
  background: var(--amber);
  color: #0f1117;
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
  padding: var(--sp-1) var(--sp-3);
}
.p-card-head { padding: var(--sp-5) var(--sp-5) var(--sp-4); border-bottom: 1px solid var(--border); }
.p-card-name { font-size: var(--fs-2); font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--fg-muted); margin: 0 0 var(--sp-3); }
.p-card-price { font-size: 3rem; font-weight: 700; line-height: 1; display: flex; align-items: baseline; gap: var(--sp-1); color: var(--fg); }
.p-card-price-currency { font-size: 1.4rem; }
.p-card-price-per { font-size: var(--fs-4); color: var(--fg-muted); margin-left: var(--sp-1); }
.p-card-trial { font-size: var(--fs-3); color: var(--fg-muted); margin-top: var(--sp-1); }
.p-card-body { padding: var(--sp-4) var(--sp-5); flex: 1; }
.p-card-body ul { list-style: none; padding: 0; }
.p-card-body li { font-size: var(--fs-4); padding: var(--sp-2) 0; border-bottom: 1px solid var(--border); display: flex; align-items: flex-start; gap: var(--sp-2); }
.p-card-body li:last-child { border-bottom: none; }
.li-check { color: #4ade80; flex-shrink: 0; }
.li-cross { color: #f87171; flex-shrink: 0; }
.li-cross-item { opacity: 0.6; }
.p-card-foot { padding: var(--sp-4) var(--sp-5) var(--sp-5); }

/* Pricing toggle */
.pricing-header { text-align: center; margin-bottom: var(--sp-7); }
.pricing-header p { color: var(--fg-muted); max-width: 480px; margin: var(--sp-2) auto 0; }
.pricing-toggle { display: flex; align-items: center; justify-content: center; gap: var(--sp-3); margin: var(--sp-5) 0; }
.pricing-toggle label { font-size: var(--fs-4); cursor: pointer; }
.toggle-switch {
  width: 40px; height: 22px;
  background: var(--bg-muted);
  border-radius: 50px;
  position: relative; cursor: pointer;
  transition: background 0.2s;
}
.toggle-switch.active { background: var(--amber); }
.toggle-thumb {
  position: absolute; top: 3px; left: 3px;
  width: 16px; height: 16px;
  background: #0f1117; border-radius: 50%;
  transition: left 0.2s;
}
.toggle-switch:not(.active) .toggle-thumb { background: var(--fg-muted); }
.toggle-switch.active .toggle-thumb { left: 21px; background: #0f1117; }
.save-badge {
  background: var(--green-bg);
  color: var(--green);
  font-size: var(--fs-2);
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
}

/* FAQ */
.faq { max-width: 580px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--border); padding: var(--sp-4) 0; }
.faq summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-4);
}
.faq summary::after { content: '+'; font-size: 1.2rem; color: var(--fg-muted); }
.faq details[open] summary::after { content: '–'; }
.faq details p { font-size: var(--fs-4); color: var(--fg-muted); padding-top: var(--sp-3); line-height: 1.7; }

/* =====================================================
   UPGRADE BANNER
   ===================================================== */

.upgrade-banner {
  background: rgba(232,197,71,0.06);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  padding: var(--sp-5) var(--sp-6);
  margin-bottom: var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  flex-wrap: wrap;
}
.upgrade-banner h3 { margin-bottom: var(--sp-1); font-size: var(--fs-5); }
.upgrade-banner p { font-size: var(--fs-4); color: var(--fg-muted); margin: 0; }

/* =====================================================
   HOMEPAGE HERO
   ===================================================== */

.hero {
  padding: var(--sp-10) var(--sp-5) var(--sp-10);
  max-width: 1100px;
  margin: 0 auto;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-10);
  align-items: center;
}

.hero-headline {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-4);
}

.hero-sub {
  font-size: var(--fs-6);
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: var(--sp-6);
  max-width: 34rem;
}

.hero-ctas {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.hero-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  box-shadow: var(--shadow-lg);
}

/* Stats bar */
.stats-bar {
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-5);
}
.stats-bar-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
  font-size: var(--fs-4);
  color: var(--fg-muted);
}
.stats-bar-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  white-space: nowrap;
}
.stats-bar-item strong { color: var(--amber); }

/* How it works */
.how-section {
  max-width: 860px;
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-5);
}
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-top: var(--sp-7);
}
.how-step {
  padding: var(--sp-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}
.how-step-num {
  width: 32px; height: 32px;
  background: var(--amber);
  color: #0f1117;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: var(--fs-3);
  font-weight: 700;
  margin-bottom: var(--sp-4);
}
.how-step h3 { margin-bottom: var(--sp-2); font-size: var(--fs-5); }
.how-step p { font-size: var(--fs-4); color: var(--fg-muted); margin: 0; }

/* Sample lessons section */
.lessons-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-5) var(--sp-10);
}
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--sp-6);
  gap: var(--sp-4);
}

/* Pricing section */
.pricing-section {
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-10) var(--sp-5);
}
.pricing-section-inner {
  max-width: 860px;
  margin: 0 auto;
}
.pricing-section h2 {
  text-align: center;
  margin-bottom: var(--sp-2);
}
.pricing-section-sub {
  text-align: center;
  color: var(--fg-muted);
  margin-bottom: var(--sp-8);
}

/* FAQ section */
.faq-section {
  max-width: 860px;
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-5);
}
.faq-section h2 { text-align: center; margin-bottom: var(--sp-7); }

/* =====================================================
   ADMIN OVERRIDES
   ===================================================== */

.admin-tab.active { background: var(--amber); color: #0f1117; border-color: var(--amber); }
.admin-tab:hover:not(.active) { background: var(--bg-subtle); }

/* =====================================================
   PROGRESS PAGE
   ===================================================== */

.section-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-5);
  margin-bottom: var(--sp-5);
}
.section-card h2 { font-size: var(--fs-5); margin-bottom: var(--sp-4); }

.quiz-history-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-4);
}
.quiz-history-row:last-child { border-bottom: none; }
.quiz-score { font-weight: 700; color: var(--amber); }

.milestone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--sp-3);
}
.milestone {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4);
  text-align: center;
}
.milestone-icon { font-size: 1.75rem; margin-bottom: var(--sp-1); }
.milestone-label { font-size: var(--fs-3); }

.category-bar { display: flex; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-2); }
.category-bar-label { font-size: var(--fs-4); min-width: 120px; text-transform: capitalize; color: var(--fg-muted); }

/* =====================================================
   VOCAB / PRON ENTRIES
   ===================================================== */

.vocab-entry, .pron-entry {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-5);
  margin-bottom: var(--sp-4);
}
.vocab-entry-top, .pron-entry-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  margin-bottom: var(--sp-3);
}
.vocab-entry-word, .pron-entry-word { font-size: var(--fs-7); font-weight: 300; color: var(--fg); line-height: 1.1; }
.vocab-entry-ipa, .pron-entry-ipa { font-family: var(--font-mono); font-size: var(--fs-4); color: var(--amber); margin-top: var(--sp-1); }
.vocab-entry-meta { font-size: var(--fs-3); color: var(--fg-muted); margin-bottom: var(--sp-2); }
.vocab-entry-def { font-size: var(--fs-4); margin-bottom: var(--sp-3); }
.vocab-entry-examples {
  list-style: none;
  border-left: 3px solid rgba(232,197,71,0.3);
  padding-left: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.vocab-entry-example {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  padding: var(--sp-1) 0;
  border-bottom: 1px solid var(--border-muted);
}
.vocab-entry-example:last-child { border-bottom: none; }
.vocab-entry-note, .pron-entry-note {
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-4);
  color: var(--fg-muted);
  font-style: italic;
  cursor: pointer;
  min-height: 40px;
}
.vocab-entry-note:empty::before { content: 'Add a personal note…'; color: var(--fg-subtle); }
.pron-entry-note:empty::before { content: 'Add a practice note…'; color: var(--fg-subtle); }
.vocab-entry-actions, .pron-entry-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border);
}
.pron-entry-tip {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  background: rgba(232,197,71,0.06);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--amber);
  margin-bottom: var(--sp-4);
}

/* Review / practice modes */
.review-mode, .practice-mode {
  background: #1a1d27;
  border: 1px solid #2e3347;
  border-radius: 12px;
  padding: var(--sp-7);
  text-align: center;
  max-width: 520px;
  margin: 0 auto var(--sp-6);
}
.review-card-word { font-size: var(--fs-8); font-weight: 300; margin-bottom: var(--sp-2); color: #eeecea; }
.review-card-hint { font-family: var(--font-mono); color: var(--amber); margin-bottom: var(--sp-5); }
.review-card-def { margin: var(--sp-5) 0; padding: var(--sp-4); background: var(--bg-subtle); border-radius: var(--radius-sm); }

.empty-state { text-align: center; padding: var(--sp-10) 0; color: var(--fg-muted); }
.empty-state-icon { font-size: 3rem; margin-bottom: var(--sp-4); }

/* Language in use — conversation sentences */
.conv-list { display: flex; flex-direction: column; gap: var(--sp-4); }
.conv-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius-sm);
  padding: var(--sp-4) var(--sp-5);
}
.conv-item-top { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--sp-3); }
.conv-sentence { font-size: var(--fs-5); font-style: italic; color: var(--fg); line-height: 1.55; margin: 0; flex: 1; }
.conv-note { font-size: var(--fs-3); color: var(--fg-muted); line-height: 1.65; margin: var(--sp-3) 0 0; }

/* Tap to reveal hint — animated amber */
.srs-reveal-hint {
  color: rgba(232,197,71,0.7);
  font-size: calc(var(--fs-3) + 2px);
  animation: bounce-hint 1.8s ease-in-out infinite;
}
@keyframes bounce-hint {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

/* SRS review rating buttons — vocab + pronunciation + sentences */
.srs-rating-btns { display:flex; gap:var(--sp-3); justify-content:center; flex-wrap:wrap; margin-top:var(--sp-4); }
.srs-btn { display:flex; flex-direction:column; align-items:center; min-width:80px; font-weight:600; border:1px solid; border-radius:var(--radius-sm); padding:var(--sp-2) var(--sp-3); cursor:pointer; background:transparent; font-family:var(--font-body); font-size:var(--fs-3); transition:background 0.15s; gap:2px; }
.srs-btn-hint { font-size:var(--fs-1); font-weight:400; opacity:0.7; white-space:nowrap; }
.srs-again { color:#ef4444; border-color:rgba(239,68,68,0.35); }
.srs-again:hover { background:rgba(239,68,68,0.1); }
.srs-hard  { color:#f97316; border-color:rgba(249,115,22,0.35); }
.srs-hard:hover  { background:rgba(249,115,22,0.1); }
.srs-good  { color:var(--green); border-color:rgba(34,197,94,0.35); }
.srs-good:hover  { background:rgba(34,197,94,0.1); }
.srs-easy  { color:#60a5fa; border-color:rgba(96,165,250,0.35); }
.srs-easy:hover  { background:rgba(96,165,250,0.1); }

/* Word highlighting in sentences */
.word-highlight { color:#e8c547; background:rgba(232,197,71,0.2); border-radius:3px; padding:1px 4px; }

/* Prominent review box — used on list pages */
.review-box {
  background: var(--amber);
  border-radius: var(--radius);
  padding: var(--sp-6) var(--sp-5);
  text-align: center;
  margin-bottom: var(--sp-5);
  box-shadow: 0 2px 8px rgba(232,197,71,0.15);
}
.review-box-count { font-size: var(--fs-8); font-weight: 800; color: #1a1a1a; margin-bottom: 4px; }
.review-box-label { font-size: var(--fs-3); color: rgba(26,26,26,0.7); font-weight: 500; margin-bottom: var(--sp-4); }
.review-box .btn {
  background: var(--amber);
  color: #1a1a1a;
  border: 2px solid #1a1a1a;
  font-weight: 700;
  font-size: var(--fs-4);
  padding: 16px 32px;
  border-radius: 8px;
}
.review-box .btn:hover { background: #d4a827; }
.review-box-muted {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4);
  text-align: center;
  margin-bottom: var(--sp-5);
}
.review-box-muted p { color: var(--fg-muted); font-size: var(--fs-3); margin-bottom: var(--sp-3); }
.review-box-muted .btn { font-size: var(--fs-3); }

/* Review cards grid — My Notes + Dashboard */
.review-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}
@media (max-width: 640px) {
  .review-cards { grid-template-columns: 1fr; }
}
.review-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--amber);
  border: none;
  border-radius: var(--radius);
  padding: var(--sp-5) var(--sp-4);
  text-decoration: none;
  transition: opacity 0.15s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(232,197,71,0.15);
}
.review-card:hover {
  opacity: 0.92;
  box-shadow: 0 4px 16px rgba(232,197,71,0.25);
}
.review-card-title {
  font-weight: 700;
  font-size: var(--fs-5);
  color: #0f1117;
  margin-bottom: 4px;
}
.review-card-count {
  font-size: var(--fs-7);
  font-weight: 800;
  color: #0f1117;
  margin-bottom: 2px;
}
.review-card-label {
  font-size: var(--fs-3);
  color: rgba(15,17,23,0.65);
  font-weight: 500;
}
@media (max-width: 640px) {
  .review-card {
    padding: var(--sp-4) var(--sp-5);
    flex-direction: row;
    justify-content: space-between;
  }
  .review-card-title { margin-bottom: 0; font-size: var(--fs-4); }
  .review-card-count { font-size: var(--fs-6); margin-bottom: 0; }
  .review-card-label { display: none; }
  .review-card-right { display: flex; align-items: center; gap: var(--sp-2); }
}

/* =====================================================
   FOOTER
   ===================================================== */

.page-footer {
  background: #0f1117;
  border-top: 1px solid var(--border);
  margin-top: var(--sp-10);
  padding: var(--sp-5) var(--sp-4);
}
.page-footer-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}
.page-footer-logo {
  display: inline-flex;
  text-decoration: none;
  margin-bottom: var(--sp-4);
}
.page-footer-logo:hover { opacity: 0.7; }
.page-footer-copy {
  font-size: var(--fs-2);
  color: var(--fg-subtle);
  margin: 0;
  line-height: 1.8;
}
.page-footer-copy a {
  color: var(--fg-subtle);
  text-decoration: none;
}
.page-footer-copy a:hover { color: var(--fg-muted); }

/* =====================================================
   PROGRESS TABLE
   ===================================================== */

.progress-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-4);
}
.progress-table th {
  text-align: left;
  font-size: var(--fs-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--border);
}
.progress-table td {
  padding: var(--sp-3);
  border-bottom: 1px solid var(--border-muted);
  vertical-align: middle;
}
.progress-table tr:last-child td { border-bottom: none; }
.progress-table td:nth-child(2),
.progress-table td:nth-child(3) { color: var(--fg-muted); }

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-card { display: none; }
  .how-grid { grid-template-columns: 1fr; gap: var(--sp-4); }
}

@media (max-width: 640px) {
  .pricing-grid { grid-template-columns: 1fr; }
  .cards-row { grid-template-columns: 1fr; }
  h1 { font-size: var(--fs-7); }
  .page-content { padding: var(--sp-6) var(--sp-4); }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .lessons-grid { grid-template-columns: 1fr; }
}

/* =====================================================
   THEME TOGGLE BUTTON
   ===================================================== */

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  border-radius: var(--radius-sm);
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  line-height: 1;
}
.theme-toggle-btn:hover { background: var(--bg-subtle); color: var(--fg); }

/* Smooth transitions during theme switch (class added/removed by theme.js) */
html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
  transition: background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s !important;
}

/* =====================================================
   LIGHT MODE — CSS variable overrides
   ===================================================== */

html.light-mode {
  --bg: #ffffff;
  --bg-subtle: #f5f5f5;
  --bg-muted: #e8e8e8;
  --fg: #1a1a1a;
  --fg-muted: #5a5a6a;
  --fg-subtle: #8a8a9a;
  --border: #e0e0e0;
  --border-muted: #ebebeb;
  --amber: #c8852a;
  --green: #16a34a;
  --green-bg: rgba(22,163,74,0.1);
  --red: #dc2626;
  --red-bg: rgba(220,38,38,0.1);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.08);
  --shadow: 0 1px 4px rgba(0,0,0,0.1), 0 4px 16px rgba(0,0,0,0.07);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.12), 0 1px 4px rgba(0,0,0,0.08);
  /* Legacy aliases */
  --body-bg: #f8f8f8;
  --body-text: #5a5a6a;
  --heading-color: #1a1a1a;
  --link-color: #c8852a;
  --border-color: #e0e0e0;
  --sidebar-bg: #ffffff;
  --feedback-color: #f5f5f5;
  --base-btn-color: #f5f5f5;
  --btn-primary-color: #c8852a;
}

/* Hardcoded color overrides for light mode */
html.light-mode body                                { background: #f8f8f8; }
html.light-mode .top-nav                            { background: rgba(248,248,248,0.92); }
html.light-mode .top-nav-links.nav-open,
html.light-mode .top-nav-actions.nav-open           { background: #ffffff; }
html.light-mode .nav-dropdown-menu                  { background: #ffffff; border-color: #e0e0e0; box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
html.light-mode .nav-dropdown-item:hover            { background: #f3f4f6; }
html.light-mode .auth-page                          { background: #f8f8f8; }
html.light-mode .gate-overlay                       { background: rgba(248,248,248,0.95); }
html.light-mode .gate-overlay h3,
html.light-mode .gate-overlay p                     { color: var(--fg); }
html.light-mode .alert-warning                      { background: rgba(200,133,42,0.08); color: #a06018; border-color: #c8852a; }
/* Lesson body background */
html.light-mode .lesson-body                        { background: #f8f8f8; }
/* Quiz question boxes in lesson */
html.light-mode .quiz-question                      { background: var(--bg-subtle); }
html.light-mode .save-dropdown-menu                 { background: #ffffff; border-color: #e0e0e0; box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
html.light-mode .save-dropdown-item:hover:not(:disabled) { background: #f3f4f6; }

/* =====================================================
   SAVE DROPDOWN — vocab card + word panel
   ===================================================== */
.save-dropdown {
  position: relative;
  display: inline-block;
}
.save-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 0;
  min-width: 160px;
  z-index: 200;
  box-shadow: var(--shadow);
}
.save-dropdown.open .save-dropdown-menu { display: block; }
@media (hover: hover) {
  .save-dropdown:hover .save-dropdown-menu { display: block; }
}
.save-dropdown-item {
  display: block;
  width: 100%;
  padding: var(--sp-2) var(--sp-4);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: var(--fs-3);
  color: var(--fg);
  font-family: var(--font-body);
  white-space: nowrap;
  line-height: 1.5;
}
.save-dropdown-item:hover:not(:disabled) { background: var(--bg-subtle); }
.save-dropdown-item:disabled { opacity: 0.65; cursor: default; }

/* =====================================================
   VOCAB CARD — collapsible
   ===================================================== */
.vocab-card-collapsible { display: none; }
.vocab-card--expanded .vocab-card-collapsible { display: block; }
.vocab-card-toggle {
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: var(--fs-3);
  font-family: var(--font-body);
  cursor: pointer;
  padding: var(--sp-2) 0;
  display: block;
}

/* =====================================================
   SECTION SEPARATION — dividers, labels, soft boxes
   ===================================================== */
.vocab-card-divider {
  border: none;
  border-top: 1px solid #2e3347;
  margin: 12px 0;
}
html.light-mode .vocab-card-divider { border-top-color: #dde1ea; }

.vocab-section-label {
  display: block;
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--amber);
  margin-bottom: var(--sp-2);
}
.vocab-section-label--inline {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--amber);
  margin-right: 6px;
}

.content-box {
  background: #1e2230;
  border-radius: 6px;
  padding: 10px 14px;
  font-size: var(--fs-3);
  color: var(--fg);
  line-height: 1.55;
  font-style: italic;
}
html.light-mode .content-box { background: #eef0f6; }
.vocab-card-toggle:hover { color: var(--fg); }

/* =====================================================
   DASHBOARD — Student & Regular User
   ===================================================== */

.dash-section {
  margin-bottom: var(--sp-6);
}

/* Header */
.dash-welcome {
  font-size: var(--fs-8);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0;
}
.dash-welcome--fraunces {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
}
.dash-header-sub {
  color: var(--fg-muted);
  font-size: var(--fs-3);
  margin: var(--sp-2) 0 0;
}

/* Latest lesson note card */
.dash-latest-note {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow);
}
.dash-latest-note-date {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-bottom: var(--sp-2);
}
.dash-latest-note-title {
  font-size: var(--fs-7);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 var(--sp-3);
}
.dash-latest-note-preview {
  color: var(--fg-muted);
  font-size: var(--fs-4);
  line-height: 1.6;
  margin: 0 0 var(--sp-5);
}
.dash-open-btn {
  background: var(--amber);
  color: #1a1a1a;
  font-weight: 700;
  border: none;
  font-size: var(--fs-5);
  padding: 14px 32px;
}
.dash-open-btn:hover { background: #d4a827; }

/* Today's Focus */
.dash-focus {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  flex-wrap: wrap;
}
.dash-focus-message {
  margin: 0;
  font-size: var(--fs-5);
  font-weight: 500;
  flex: 1;
}
.dash-focus-message--subtle {
  font-weight: 400;
  color: var(--fg-muted);
}
.dash-focus-btn {
  background: var(--amber);
  color: #1a1a1a;
  font-weight: 700;
  border: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.dash-focus-btn:hover { background: #d4a827; }
.dash-inline-link {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.dash-inline-link:hover { opacity: 0.8; }

/* Words mastered */
.dash-mastered {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.dash-mastered-count {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
  flex-shrink: 0;
}
.dash-mastered-info { display: flex; flex-direction: column; gap: 3px; }
.dash-mastered-label {
  font-size: var(--fs-5);
  font-weight: 600;
  color: var(--fg);
}
.dash-mastered-sub {
  font-size: var(--fs-3);
  color: var(--fg-muted);
}
.dash-mastered-coming {
  font-size: var(--fs-3);
  color: var(--fg-subtle);
  margin-top: 2px;
}

/* Lesson rows (previous lessons / recent activity) */
.dash-section-label {
  font-size: var(--fs-3);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  margin: 0 0 var(--sp-3);
}
.dash-lessons-list {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.dash-lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.dash-lesson-row:last-child { border-bottom: none; }
.dash-lesson-row-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.dash-lesson-row-title {
  font-size: var(--fs-4);
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dash-lesson-row-date {
  font-size: var(--fs-2);
  color: var(--fg-muted);
}

/* Streak */
.dash-streak {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.dash-streak--prominent {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
  display: inline-flex;
}
.dash-streak-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.dash-streak-num {
  font-size: var(--fs-8);
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
}
.dash-streak-num--muted { color: var(--fg-muted); }
.dash-streak-label {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  font-weight: 500;
}
.dash-streak-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
  flex-shrink: 0;
}

/* Upgrade prompt (free users) */
.dash-upgrade {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  margin: 0;
}
.dash-upgrade-link {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
}
.dash-upgrade-link:hover { opacity: 0.8; }

/* Library welcome banner */
.lib-welcome-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  background: rgba(232,197,71,0.10);
  border: 1px solid rgba(232,197,71,0.3);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-6);
}
.lib-welcome-banner p {
  margin: 0;
  font-size: var(--fs-4);
  color: var(--fg);
}
.lib-welcome-dismiss {
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  flex-shrink: 0;
}
.lib-welcome-dismiss:hover { color: var(--fg); }

/* =====================================================
   STUDENT DASHBOARD — additional components
   ===================================================== */

/* Latest lesson card — amber accent variant */
.dash-latest-note--accent {
  border-left: 3px solid var(--amber);
}

/* Vocabulary section */
.dash-vocab-stats {
  display: flex;
  gap: var(--sp-7);
  margin-bottom: var(--sp-4);
}
.dash-vocab-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.dash-vocab-stat-num {
  font-size: var(--fs-8);
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
}
.dash-vocab-stat-label {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  font-weight: 500;
}
.dash-vocab-words {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: var(--sp-3);
}
.dash-vocab-word-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.dash-vocab-word-row:last-child { border-bottom: none; }
.dash-vocab-word-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.dash-vocab-word {
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--fg);
}
.dash-vocab-def {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dash-see-all {
  font-size: var(--fs-3);
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
}
.dash-see-all:hover { opacity: 0.8; }

/* Grammar correction patterns */
.dash-grammar-patterns {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.dash-grammar-pattern {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.dash-grammar-pattern:last-child { border-bottom: none; }
.dash-grammar-pattern-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.dash-grammar-pattern-name {
  font-size: var(--fs-4);
  font-weight: 500;
  color: var(--fg);
}
.dash-grammar-pattern-count {
  font-size: var(--fs-2);
  color: var(--fg-muted);
}

/* =====================================================
   STUDENT DASHBOARD — sd- components
   ===================================================== */

.sd-container { max-width: 600px; margin: 0 auto; }
.sd-stack { display: flex; flex-direction: column; gap: 12px; }

/* Two-column grid for action cards */
.sd-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 520px) {
  .sd-grid { grid-template-columns: 1fr; }
}

/* Base card */
.sd-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
}

/* Card eyebrow label */
.sd-card-label {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
  margin: 0 0 var(--sp-3);
}

/* Count number (vocab due, grammar due) */
.sd-count-num {
  font-size: var(--fs-8);
  font-weight: 700;
  line-height: 1;
  color: var(--fg);
  margin: 0 0 var(--sp-1);
}
.sd-count-label {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin: 0 0 var(--sp-4);
}

/* Full-width amber button */
.sd-btn-primary {
  display: block;
  width: 100%;
  background: var(--amber);
  color: #1a1a1a;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55em 1em;
  font-size: var(--fs-4);
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  box-sizing: border-box;
  font-family: var(--font-body);
  transition: background 0.15s;
}
.sd-btn-primary:hover { background: #d4a827; color: #1a1a1a; }

/* Latest lesson */
.sd-lesson-date {
  font-size: var(--fs-6);
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 var(--sp-4);
}

/* All lessons list */
.sd-lessons-list { margin-top: var(--sp-2); }
.sd-lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--border);
}
.sd-lesson-row:last-child { border-bottom: none; }
.sd-lesson-row-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.sd-lesson-row-title {
  font-size: var(--fs-4);
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sd-lesson-row-date { font-size: var(--fs-2); color: var(--fg-muted); }

/* Inline Flashcard Overlay */
.ifc-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 9000;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.ifc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.ifc-header-title {
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--fg);
  margin: 0;
}
.ifc-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--fg-muted);
  padding: 4px 8px;
  line-height: 1;
}
.ifc-close-btn:hover { color: var(--fg); }
.ifc-body {
  flex: 1;
  max-width: 560px;
  margin: 0 auto;
  width: 100%;
  padding: var(--sp-6) var(--sp-5);
  box-sizing: border-box;
}

/* =====================================================
   POLISH — Page fade-in, buttons, cards, focus, scrollbar
   ===================================================== */

/* Page fade-in */
@keyframes pe-fadein { from { opacity: 0; } to { opacity: 1; } }
body { animation: pe-fadein 200ms ease both; }

/* Button transitions — primary brightness, outline amber fill */
.btn { transition: background 0.15s, border-color 0.15s, color 0.15s, filter 0.15s, transform 0.15s; }
.btn-primary { transition: background 0.15s, border-color 0.15s, filter 0.15s; }
.btn-primary:hover { background: var(--amber); border-color: var(--amber); filter: brightness(1.1); }
.btn-outline:hover { background: rgba(232,197,71,0.1); border-color: var(--amber); color: var(--amber); }

/* Lesson card hover lift on desktop */
.lesson-card { transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s; }
@media (hover: hover) {
  .lesson-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.25); border-color: var(--amber); }
}

/* Focus states — amber ring replaces browser default */
:focus-visible { outline: 2px solid #e8c547; outline-offset: 3px; }

/* Custom scrollbar (webkit) */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #0f1117; }
::-webkit-scrollbar-thumb { background: #2e3347; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #e8c547; }
* { scrollbar-width: thin; scrollbar-color: #2e3347 #0f1117; }

/* Skeleton loading */
@keyframes pe-shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position:  400px 0; }
}
.skeleton {
  background: #2e3347;
  background-image: linear-gradient(90deg, #2e3347 0px, #3a405a 80px, #2e3347 160px);
  background-size: 400px 100%;
  animation: pe-shimmer 1.4s ease-in-out infinite;
  border-radius: 4px;
}
.skeleton-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.skeleton-line { height: 14px; border-radius: 4px; }
.skeleton-line--short { width: 40%; }
.skeleton-line--medium { width: 65%; }
.skeleton-line--full { width: 100%; }
.skeleton-line--title { height: 18px; width: 80%; }