/* ==========================================================================
   Owitics German Flashcards: Ivory & Bronze design system
   ========================================================================== */

:root {
  /* Palette */
  --ivory: #f7f2e9;
  --paper: #fffdf8;
  --paper-warm: #fbf7ee;
  --ink: #26221c;
  --ink-soft: #57503f;
  --ink-faint: #8a8171;
  --bronze: #a67c44;
  --bronze-deep: #8a6534;
  --bronze-pale: #e9dcc3;
  --bronze-wash: rgba(166, 124, 68, 0.08);
  --line: #e5dccb;
  --success: #4a6b4f;
  --danger: #9c4a3c;

  /* Type */
  --serif: 'Fraunces', 'Georgia', serif;
  --sans: 'Inter', -apple-system, 'Segoe UI', sans-serif;

  /* Depth */
  --shadow-sm: 0 1px 3px rgba(58, 48, 30, 0.08);
  --shadow-md: 0 6px 24px rgba(58, 48, 30, 0.1);
  --shadow-lg: 0 18px 50px rgba(58, 48, 30, 0.16);

  --radius: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  background: var(--ivory);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Subtle paper grain over the whole page */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  background-image: radial-gradient(rgba(166, 124, 68, 0.05) 1px, transparent 1px);
  background-size: 22px 22px;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

a {
  color: var(--bronze-deep);
}

button {
  font-family: var(--sans);
  cursor: pointer;
}

/* ==========================================================================
   Entrance animations
   ========================================================================== */

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes cardSwapNext {
  0%   { opacity: 0; transform: translateX(34px) rotate(0.8deg); }
  100% { opacity: 1; transform: translateX(0) rotate(0); }
}

@keyframes cardSwapPrev {
  0%   { opacity: 0; transform: translateX(-34px) rotate(-0.8deg); }
  100% { opacity: 1; transform: translateX(0) rotate(0); }
}

@keyframes pulseRing {
  0%   { box-shadow: 0 0 0 0 rgba(166, 124, 68, 0.35); }
  100% { box-shadow: 0 0 0 14px rgba(166, 124, 68, 0); }
}

.anim-rise { animation: rise 0.7s var(--ease) both; }
.anim-rise-1 { animation: rise 0.7s var(--ease) 0.08s both; }
.anim-rise-2 { animation: rise 0.7s var(--ease) 0.16s both; }
.anim-rise-3 { animation: rise 0.7s var(--ease) 0.24s both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 242, 233, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}

.nav-brand .brand-sub {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bronze);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.45rem 0.8rem;
  border-radius: 8px;
  transition: color 0.25s, background 0.25s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--bronze-deep);
  background: var(--bronze-wash);
}

/* Buttons */
.btn {
  border: none;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.55rem 1.15rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, color 0.25s;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-bronze {
  background: linear-gradient(135deg, var(--bronze) 0%, var(--bronze-deep) 100%);
  color: var(--paper);
  box-shadow: var(--shadow-sm);
}

.btn-bronze:hover { box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: var(--bronze);
  color: var(--bronze-deep);
}

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.5rem 0.35rem 0.9rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.user-chip .chip-badge {
  background: var(--bronze-pale);
  color: var(--bronze-deep);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
}

.user-chip button {
  background: none;
  border: none;
  color: var(--ink-faint);
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
}

.user-chip button:hover {
  color: var(--danger);
  background: rgba(156, 74, 60, 0.08);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  text-align: center;
  padding: 4.5rem 1.5rem 3rem;
  position: relative;
}

.hero .kicker {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bronze);
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-size: clamp(2.3rem, 5.5vw, 3.6rem);
  font-weight: 600;
  max-width: 17ch;
  margin: 0 auto 1.1rem;
}

.hero h1 em {
  font-style: italic;
  color: var(--bronze-deep);
}

.hero .lede {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 52ch;
  margin: 0 auto;
}

.hero .rule {
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--bronze), transparent);
  margin: 2.2rem auto 0;
  border: none;
}

/* ==========================================================================
   Study area
   ========================================================================== */

.main-container {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

.lesson-selector {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.lesson-selector label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.lesson-selector select {
  appearance: none;
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' fill='none'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%23a67c44' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 1.1rem center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 3rem 0.9rem 1.1rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.lesson-selector select:hover { border-color: var(--bronze); }

.lesson-selector select:focus {
  outline: none;
  border-color: var(--bronze);
  box-shadow: 0 0 0 3px var(--bronze-wash), var(--shadow-sm);
}

/* Progress */
.progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 1.1rem;
}

.progress-track {
  flex: 1;
  height: 3px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--bronze-pale), var(--bronze));
  border-radius: 999px;
  transition: width 0.5s var(--ease);
}

/* Flashcard */
.flashcard-scene {
  perspective: 1400px;
  margin-bottom: 1.6rem;
}

.flashcard {
  position: relative;
  width: 100%;
  min-height: 320px;
  transform-style: preserve-3d;
  transition: transform 0.7s var(--ease);
  cursor: pointer;
}

.flashcard.flipped { transform: rotateY(180deg); }
.flashcard.swap-next { animation: cardSwapNext 0.45s var(--ease); }
.flashcard.swap-prev { animation: cardSwapPrev 0.45s var(--ease); }

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  padding: 2.5rem 2rem;
  border-radius: calc(var(--radius) + 6px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.flashcard-front {
  background:
    linear-gradient(160deg, var(--paper) 0%, var(--paper-warm) 100%);
  transition: background 0.4s, border-color 0.4s;
}

/* Noun gender tints: die = baby pink, der = pastel blue, das = soft green */
.flashcard-front.gender-die {
  background: linear-gradient(160deg, #fdf1f4 0%, #f7dde5 100%);
  border-color: #eec9d4;
}

.flashcard-front.gender-der {
  background: linear-gradient(160deg, #eff5fb 0%, #dce9f6 100%);
  border-color: #c9d9ec;
}

.flashcard-front.gender-das {
  background: linear-gradient(160deg, #f0f7ee 0%, #dfeeda 100%);
  border-color: #c9dfc2;
}

.flashcard-front.gender-both {
  background: linear-gradient(120deg, #f7dde5 0%, #fdf6f0 50%, #dce9f6 100%);
  border-color: #d9cede;
}

.flashcard-front.gender-idiom {
  background: linear-gradient(160deg, #f4f0f9 0%, #e8e0f1 100%);
  border-color: #d5c9e5;
}

.flashcard-back {
  background: linear-gradient(160deg, var(--paper-warm) 0%, var(--bronze-pale) 160%);
  transform: rotateY(180deg);
}

.flashcard-face .face-label {
  position: absolute;
  top: 1.1rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bronze);
}

.flashcard-face .word {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 600;
  color: var(--ink);
  max-width: 24ch;
}

.flashcard-face .hint {
  position: absolute;
  bottom: 1.1rem;
  font-size: 0.75rem;
  color: var(--ink-faint);
}

/* Pronunciation buttons */
.speak-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.speak-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bronze-wash);
  color: var(--bronze-deep);
  border: 1px solid var(--bronze-pale);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  transition: background 0.25s, transform 0.25s var(--ease), box-shadow 0.25s;
}

.speak-btn:hover {
  background: var(--bronze-pale);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.speak-btn.speaking {
  animation: pulseRing 1.1s ease-out infinite;
  background: var(--bronze-pale);
}

.speak-btn svg { flex-shrink: 0; }

/* Controls */
.flashcard-controls {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.flashcard-controls button {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), border-color 0.25s, color 0.25s, box-shadow 0.25s;
}

.flashcard-controls button:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--bronze);
  color: var(--bronze-deep);
  box-shadow: var(--shadow-md);
}

.flashcard-controls button:disabled {
  opacity: 0.4;
  cursor: default;
}

.keyboard-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin-top: 1.2rem;
}

.keyboard-hint kbd {
  font-family: var(--sans);
  background: var(--paper);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.05rem 0.4rem;
  font-size: 0.72rem;
}

/* ==========================================================================
   How-to guide
   ========================================================================== */

.guide {
  margin-top: 3.5rem;
  scroll-margin-top: 5rem;
}

.guide h2 {
  font-size: 1.55rem;
  margin-bottom: 0.4rem;
}

.guide-intro {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}

.guide-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.4rem;
}

.guide-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.guide-item p,
.guide-item li {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.guide-item p + p { margin-top: 0.5rem; }

.guide-item ul {
  padding-left: 1.2rem;
  margin-top: 0.4rem;
}

.guide-item kbd {
  font-family: var(--sans);
  background: var(--ivory);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.05rem 0.4rem;
  font-size: 0.75rem;
}

.legend {
  list-style: none;
  padding: 0 !important;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.6rem;
}

.legend li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.swatch {
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 6px;
  border: 1px solid rgba(58, 48, 30, 0.12);
  flex-shrink: 0;
}

.swatch-die { background: #f7dde5; }
.swatch-der { background: #dce9f6; }
.swatch-das { background: #dfeeda; }
.swatch-both { background: linear-gradient(120deg, #f7dde5, #dce9f6); }
.swatch-idiom { background: #e8e0f1; }

/* ==========================================================================
   Premium upsell
   ========================================================================== */

.premium-upsell { animation: rise 0.6s var(--ease) both; }

.upsell-card {
  background: var(--paper);
  border: 1px solid var(--bronze-pale);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow-lg);
  padding: 3rem 2.2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.upsell-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--bronze), transparent);
}

.upsell-card h2 {
  font-size: 1.7rem;
  margin-bottom: 0.5rem;
}

.upsell-card > p {
  color: var(--ink-soft);
  margin-bottom: 1.8rem;
}

.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.7rem;
  max-width: 500px;
  margin: 0 auto 2rem;
  text-align: left;
}

.feature {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.feature::before {
  content: '✦';
  color: var(--bronze);
  flex-shrink: 0;
}

.price-tag {
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.price-tag span {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-faint);
}

.price-note {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 1.6rem;
}

.subscribe-btn {
  background: linear-gradient(135deg, var(--bronze) 0%, var(--bronze-deep) 100%);
  color: var(--paper);
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.95rem 2.4rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.subscribe-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255, 253, 248, 0.35) 50%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.7s ease;
}

.subscribe-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.subscribe-btn:hover::after { transform: translateX(120%); }

.upsell-footnote {
  margin-top: 1.4rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

/* ==========================================================================
   Modals
   ========================================================================== */

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(38, 34, 28, 0.45);
  backdrop-filter: blur(6px);
  padding: 1.5rem;
  overflow-y: auto;
}

.modal.open {
  display: grid;
  place-items: center;
  animation: fadeIn 0.3s ease both;
}

.modal-content {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
  animation: rise 0.45s var(--ease) both;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 1.6rem 0;
}

.modal-header h2 {
  font-size: 1.45rem;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--ink-faint);
  padding: 0.2rem 0.5rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}

.close-btn:hover {
  color: var(--ink);
  background: var(--bronze-wash);
}

.modal-body { padding: 1.2rem 1.6rem 1.8rem; }

/* Auth tabs */
.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  background: var(--ivory);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.3rem;
  margin-bottom: 1.4rem;
}

.auth-tabs button {
  background: transparent;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-faint);
  padding: 0.5rem;
  transition: background 0.25s, color 0.25s, box-shadow 0.25s;
}

.auth-tabs button.active {
  background: var(--paper);
  color: var(--bronze-deep);
  box-shadow: var(--shadow-sm);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.form-field label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.form-field input,
.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--sans);
  font-size: 0.98rem;
  color: var(--ink);
  background: var(--paper-warm);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  width: 100%;
}

.form-field input:focus,
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--bronze);
  box-shadow: 0 0 0 3px var(--bronze-wash);
}

.form-error {
  display: none;
  font-size: 0.85rem;
  color: var(--danger);
  background: rgba(156, 74, 60, 0.08);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  margin-bottom: 1rem;
}

.form-error.visible { display: block; }

.modal-submit {
  width: 100%;
  background: linear-gradient(135deg, var(--bronze) 0%, var(--bronze-deep) 100%);
  color: var(--paper);
  border: none;
  border-radius: 10px;
  font-size: 0.98rem;
  font-weight: 600;
  padding: 0.85rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s, opacity 0.25s;
}

.modal-submit:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.modal-submit:disabled { opacity: 0.6; cursor: default; }

.secure-notice {
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-top: 1rem;
}

.price-display {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.2rem;
}

.subscription-info {
  text-align: center;
  font-size: 0.88rem;
  color: var(--ink-faint);
  margin-bottom: 1.4rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.6rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink);
  color: var(--ivory);
  font-size: 0.9rem;
  padding: 0.8rem 1.4rem;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s, transform 0.4s var(--ease);
  z-index: 200;
  max-width: min(90vw, 480px);
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ==========================================================================
   Content pages (about / contact / privacy)
   ========================================================================== */

.page-container {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

.page-container .kicker {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bronze);
  margin-bottom: 0.8rem;
}

.page-container h1 {
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  margin-bottom: 1.4rem;
}

.page-container h2 {
  font-size: 1.4rem;
  margin: 2.2rem 0 0.7rem;
}

.page-container p,
.page-container li {
  color: var(--ink-soft);
}

.page-container ul {
  padding-left: 1.3rem;
  margin: 0.6rem 0;
}

.page-container .card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.8rem;
  margin-top: 1.6rem;
}

.form-group { margin-bottom: 1.1rem; }

.form-group label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.35rem;
}

.submit-btn {
  background: linear-gradient(135deg, var(--bronze) 0%, var(--bronze-deep) 100%);
  color: var(--paper);
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.8rem 1.8rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}

.submit-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-warm);
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.footer-inner nav {
  display: flex;
  gap: 1.2rem;
}

.footer-inner a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-inner a:hover { color: var(--bronze-deep); }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .nav-container {
    flex-direction: column;
    padding: 0.8rem 1rem;
  }

  .nav-links { justify-content: center; }

  .hero { padding: 3rem 1.2rem 2.2rem; }

  .flashcard { min-height: 280px; }

  .flashcard-face .word { font-size: 1.4rem; }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}