/* ═══════════════════════════════════════════════════════════════════════════
   LEXISCAN — MAIN STYLESHEET
   Design: Deep midnight blue with amber accent, refined editorial feel
   Font: Bricolage Grotesque (display) + Lora (body) + DM Mono (code/labels)
═══════════════════════════════════════════════════════════════════════════ */

/* ─── CSS Variables ────────────────────────────────────────────────────────── */
:root {
  /* Colors */
  --bg-base:       #0a0b10;
  --bg-surface:    #10121a;
  --bg-elevated:   #171924;
  --bg-border:     #1e2130;
  --bg-hover:      #232636;

  --text-primary:  #f0f2ff;
  --text-secondary:#8890b0;
  --text-tertiary: #545870;
  --text-inverse:  #0a0b10;

  --accent:        #f5a623;
  --accent-hover:  #ffb940;
  --accent-muted:  rgba(245,166,35,0.15);
  --accent-glow:   rgba(245,166,35,0.3);

  --success:       #22c55e;
  --success-muted: rgba(34,197,94,0.12);
  --danger:        #ef4444;
  --danger-muted:  rgba(239,68,68,0.12);
  --info:          #6366f1;
  --info-muted:    rgba(99,102,241,0.12);

  /* Typography */
  --font-display: 'Bricolage Grotesque', sans-serif;
  --font-body:    'Lora', serif;
  --font-mono:    'DM Mono', monospace;

  /* Spacing */
  --nav-h:        64px;
  --max-w:        1200px;
  --radius-sm:    6px;
  --radius-md:    12px;
  --radius-lg:    20px;
  --radius-xl:    32px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.6), 0 4px 16px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(245,166,35,0.15);

  /* Transitions */
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:  150ms;
  --dur-med:   300ms;
  --dur-slow:  600ms;
}

/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, textarea { font: inherit; color: inherit; }

/* ─── Custom Scrollbar ─────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ─── Cursor Glow ──────────────────────────────────────────────────────────── */
#cursorGlow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,166,35,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: transform 0.1s linear;
}

/* ─── Loading Screen ───────────────────────────────────────────────────────── */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-base);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--dur-slow) var(--ease-out);
}

.loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.loading-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.loading-logo .logo-icon {
  font-size: 2.2rem;
  color: var(--accent);
  animation: spin 2s linear infinite;
}

.loading-bar-wrap {
  width: 200px;
  height: 3px;
  background: var(--bg-border);
  border-radius: 2px;
  overflow: hidden;
}

.loading-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  animation: loadingProgress 1.5s var(--ease-out) forwards;
}

.loading-sub {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

@keyframes loadingProgress {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ─── Navigation ───────────────────────────────────────────────────────────── */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(10,11,16,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--bg-border);
  transition: all var(--dur-med) var(--ease-out);
}

.main-nav.scrolled {
  background: rgba(10,11,16,0.95);
  box-shadow: var(--shadow-md);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: opacity var(--dur-fast);
}

.nav-logo:hover { opacity: 0.8; }

.nav-logo .logo-icon {
  font-size: 1.4rem;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
  cursor: pointer;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

/* User menu */
.user-menu-wrap {
  position: relative;
}

.user-avatar-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--accent-muted);
  border: 2px solid var(--bg-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast);
  cursor: pointer;
}

.user-avatar-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.user-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-avatar-initial {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  text-transform: uppercase;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  overflow: hidden;
  animation: dropdownAppear var(--dur-med) var(--ease-spring);
}

@keyframes dropdownAppear {
  from { opacity: 0; transform: translateY(-8px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.user-info {
  padding: 14px 16px;
}

.user-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.user-email {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.user-dropdown hr {
  border: none;
  border-top: 1px solid var(--bg-border);
  margin: 4px 0;
}

.dropdown-item {
  width: 100%;
  text-align: left;
  padding: 10px 16px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
  cursor: pointer;
}

.dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.dropdown-item.danger { color: var(--danger); }
.dropdown-item.danger:hover { background: var(--danger-muted); color: var(--danger); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast);
}

.nav-hamburger:hover { background: var(--bg-hover); }

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--dur-med) var(--ease-out);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav drawer */
.mobile-nav-drawer {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bg-border);
  z-index: 99;
  padding: 16px;
  animation: slideDown var(--dur-med) var(--ease-out);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-link {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* ─── Buttons ──────────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--dur-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity var(--dur-fast);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover::before { opacity: 1; }
.btn-primary:active { transform: translateY(0); }

.btn-primary.full-width { width: 100%; justify-content: center; }
.btn-primary.btn-large { padding: 14px 28px; font-size: 1rem; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--dur-fast);
  white-space: nowrap;
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.btn-ghost.small { padding: 6px 14px; font-size: 0.8rem; }

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--danger);
  color: white;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--dur-fast);
}

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(239,68,68,0.3);
}

.btn-dashed {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: transparent;
  color: var(--text-secondary);
  border: 2px dashed var(--bg-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--dur-fast);
  width: 100%;
  justify-content: center;
}

.btn-dashed:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-muted);
}

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 11px 20px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--dur-fast);
}

.btn-google:hover {
  background: var(--bg-hover);
  border-color: var(--text-tertiary);
  transform: translateY(-1px);
}

.btn-loader {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0,0,0,0.2);
  border-top-color: rgba(0,0,0,0.6);
  border-radius: 50%;
  animation: spinLoader 0.6s linear infinite;
}

@keyframes spinLoader {
  to { transform: rotate(360deg); }
}

/* ─── Auth Modal ───────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn var(--dur-med);
}

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

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  width: 100%;
  max-width: 440px;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: scaleIn var(--dur-med) var(--ease-spring);
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-hover);
  color: var(--text-secondary);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast);
}

.modal-close:hover {
  background: var(--bg-border);
  color: var(--text-primary);
}

.auth-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 28px;
}

.auth-logo .logo-icon { color: var(--accent); }

.auth-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 24px;
}

.auth-tab {
  flex: 1;
  padding: 8px;
  border-radius: calc(var(--radius-sm) - 2px);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
}

.auth-tab.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.auth-panel { display: none; flex-direction: column; gap: 14px; }
.auth-panel.active { display: flex; }

.auth-divider {
  text-align: center;
  position: relative;
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: calc(50% - 24px);
  height: 1px;
  background: var(--bg-border);
}

.auth-divider::before { left: 0; }
.auth-divider::after { right: 0; }

.auth-divider span {
  background: var(--bg-surface);
  padding: 0 8px;
  position: relative;
  z-index: 1;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.form-group input {
  padding: 11px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--dur-fast);
  outline: none;
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.form-group input::placeholder { color: var(--text-tertiary); }

.auth-error {
  font-size: 0.82rem;
  color: var(--danger);
  background: var(--danger-muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(239,68,68,0.2);
}

/* ─── Pages ────────────────────────────────────────────────────────────────── */
#appMain {
  padding-top: var(--nav-h);
}

.page {
  min-height: calc(100vh - var(--nav-h));
  animation: pageFade var(--dur-med) var(--ease-out);
}

.page.hidden { display: none !important; }

@keyframes pageFade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Hero ─────────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 90vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 60px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 40px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: orbFloat 8s ease-in-out infinite;
}

.hero-orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245,166,35,0.08), transparent 70%);
  top: -100px;
  left: -100px;
}

.hero-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(99,102,241,0.06), transparent 70%);
  top: 50%;
  right: -80px;
  animation-delay: -3s;
}

.hero-orb-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(245,166,35,0.05), transparent 70%);
  bottom: -50px;
  left: 40%;
  animation-delay: -5s;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--bg-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent);
}

@keyframes orbFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-30px); }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-muted);
  border: 1px solid var(--accent-glow);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  width: fit-content;
  animation: fadeSlideUp 0.6s var(--ease-out) 0.2s both;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  animation: fadeSlideUp 0.6s var(--ease-out) 0.3s both;
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
  font-family: var(--font-body);
}

.hero-highlight {
  position: relative;
  display: inline-block;
}

.hero-highlight::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  animation: lineGrow 0.8s var(--ease-out) 0.8s both;
  transform-origin: left;
}

@keyframes lineGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.hero-sub {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 520px;
  animation: fadeSlideUp 0.6s var(--ease-out) 0.4s both;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  animation: fadeSlideUp 0.6s var(--ease-out) 0.5s both;
}

.hero-cta {
  padding: 13px 26px;
  font-size: 1rem;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-top: 8px;
  animation: fadeSlideUp 0.6s var(--ease-out) 0.6s both;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stat strong {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
}

.hero-stat span {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.hero-stat-divider {
  width: 1px;
  height: 36px;
  background: var(--bg-border);
}

/* Hero visual */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  animation: fadeSlideUp 0.8s var(--ease-out) 0.4s both;
}

.hero-card-stack {
  position: relative;
  width: 340px;
  height: 280px;
}

.demo-card {
  position: absolute;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform var(--dur-slow) var(--ease-spring);
}

.demo-card-3 {
  width: 300px;
  height: 200px;
  bottom: 0;
  right: 0;
  transform: rotate(6deg);
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-hover));
  display: flex;
  align-items: flex-start;
  padding: 16px;
}

.demo-card-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.demo-card-2 {
  width: 300px;
  height: 200px;
  bottom: 20px;
  right: 20px;
  transform: rotate(2deg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-word {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.demo-word-nl {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.demo-word-en {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
}

.demo-card-1 {
  width: 300px;
  height: 200px;
  bottom: 40px;
  right: 40px;
  transform: rotate(-1deg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-card-stack:hover .demo-card-3 { transform: rotate(8deg) translateY(-8px); }
.hero-card-stack:hover .demo-card-2 { transform: rotate(3deg) translateY(-4px); }
.hero-card-stack:hover .demo-card-1 { transform: rotate(-2deg) translateY(-2px); }

.demo-flashcard-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  text-align: center;
}

.demo-fc-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

.demo-fc-word {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.demo-fc-flip {
  padding: 6px 14px;
  background: var(--accent-muted);
  color: var(--accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--dur-fast);
}

.demo-fc-flip:hover {
  background: var(--accent);
  color: var(--text-inverse);
}

/* ─── Features Section ─────────────────────────────────────────────────────── */
.features-section {
  padding: 100px 40px;
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--dur-med) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}

.feature-card:hover {
  border-color: var(--bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::before { transform: scaleX(1); }

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--accent-muted);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 18px;
  transition: all var(--dur-med);
}

.feature-card:hover .feature-icon {
  background: var(--accent);
  color: var(--text-inverse);
  transform: scale(1.05);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ─── How it works ─────────────────────────────────────────────────────────── */
.how-section {
  padding: 80px 40px;
  background: var(--bg-surface);
}

.steps-container {
  display: flex;
  align-items: center;
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
}

.step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 24px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  padding: 6px 12px;
  background: var(--accent-muted);
  border-radius: 100px;
  border: 1px solid var(--accent-glow);
}

.step-content h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.step-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 240px;
  margin: 0 auto;
}

.step-arrow {
  font-size: 1.5rem;
  color: var(--accent);
  margin: 0 -12px;
  flex-shrink: 0;
  z-index: 1;
}

/* ─── CTA Banner ───────────────────────────────────────────────────────────── */
.cta-banner {
  position: relative;
  padding: 100px 40px;
  text-align: center;
  overflow: hidden;
}

.cta-banner-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cta-orb {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,166,35,0.1), transparent 60%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  filter: blur(40px);
}

.cta-banner-content {
  position: relative;
  z-index: 1;
}

.cta-banner h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

/* ─── Page Header (inner pages) ────────────────────────────────────────────── */
.page-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 40px 32px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.page-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ─── Upload Zone ──────────────────────────────────────────────────────────── */
.upload-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px 60px;
}

.upload-zone {
  border: 2px dashed var(--bg-border);
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  position: relative;
  overflow: hidden;
  transition: all var(--dur-med) var(--ease-out);
  cursor: pointer;
}

.upload-zone.dragging {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.upload-zone.dragging .upload-zone-inner { opacity: 0.5; pointer-events: none; }
.upload-zone.dragging .upload-drag-overlay { opacity: 1; }

.upload-zone-inner {
  padding: 80px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  transition: all var(--dur-med);
}

.upload-icon {
  width: 80px;
  height: 80px;
  background: var(--bg-elevated);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--dur-med);
  border: 1px solid var(--bg-border);
}

.upload-zone:hover .upload-icon {
  background: var(--accent-muted);
  color: var(--accent);
  border-color: var(--accent-glow);
  transform: scale(1.05);
}

.upload-zone-inner h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-zone-inner p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.upload-formats {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.upload-drag-overlay {
  position: absolute;
  inset: 0;
  background: var(--accent-muted);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--dur-fast);
}

.upload-drag-overlay p {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}

/* Upload preview section */
.upload-preview-section { margin-top: 32px; }

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  align-items: start;
}

.preview-section-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.badge-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  background: var(--accent-muted);
  color: var(--accent);
  border-radius: 100px;
  border: 1px solid var(--accent-glow);
  font-weight: 400;
}

.preview-img-container {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-img-container img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* OCR processing */
.ocr-processing {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.ocr-progress {
  height: 4px;
  background: var(--bg-border);
  border-radius: 2px;
  margin-bottom: 14px;
  overflow: hidden;
}

.ocr-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  transition: width 0.5s var(--ease-out);
  width: 0%;
}

.ocr-status {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.ocr-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ocr-step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  transition: color var(--dur-med);
}

.ocr-step.active { color: var(--accent); }
.ocr-step.done { color: var(--success); }

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-border);
  flex-shrink: 0;
  transition: background var(--dur-med);
}

.ocr-step.active .step-dot {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
  animation: stepPulse 1s infinite;
}

.ocr-step.done .step-dot {
  background: var(--success);
}

@keyframes stepPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.7); }
}

/* Word list editor */
.word-list-editor {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.editor-hint {
  font-size: 0.83rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-border);
}

.word-pairs-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 360px;
  overflow-y: auto;
  padding-right: 4px;
}

.word-pair-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  align-items: center;
  animation: fadeSlideUp var(--dur-fast) var(--ease-out);
}

.word-pair-row input {
  padding: 9px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  transition: all var(--dur-fast);
  outline: none;
}

.word-pair-row input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-muted);
}

.word-pair-delete {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: all var(--dur-fast);
  flex-shrink: 0;
}

.word-pair-delete:hover {
  background: var(--danger-muted);
  color: var(--danger);
}

.list-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 16px;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-border);
}

.editor-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* ─── Dashboard / Lists grid ───────────────────────────────────────────────── */
.filter-bar {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px 24px;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--dur-fast);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.search-input::placeholder { color: var(--text-tertiary); }

.filter-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-border);
}

.filter-tab {
  padding: 6px 14px;
  border-radius: calc(var(--radius-sm) - 2px);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
}

.filter-tab.active {
  background: var(--accent);
  color: var(--text-inverse);
}

.filter-tab:not(.active):hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.lists-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px 60px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.list-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--dur-med) var(--ease-out);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  animation: fadeSlideUp var(--dur-med) var(--ease-out);
}

.list-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--info));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med);
}

.list-card:hover {
  transform: translateY(-4px);
  border-color: var(--bg-hover);
  box-shadow: var(--shadow-md);
}

.list-card:hover::before { transform: scaleX(1); }

.list-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.list-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  word-break: break-word;
}

.list-card-menu-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--dur-fast);
  flex-shrink: 0;
}

.list-card-menu-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.list-card-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.list-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 100px;
  background: var(--bg-elevated);
  color: var(--text-tertiary);
  border: 1px solid var(--bg-border);
}

.list-chip.lang {
  background: var(--info-muted);
  color: var(--info);
  border-color: rgba(99,102,241,0.2);
}

.list-progress-wrap {
  margin-bottom: 16px;
}

.list-progress-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.list-progress-bar-bg {
  height: 4px;
  background: var(--bg-border);
  border-radius: 2px;
  overflow: hidden;
}

.list-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  transition: width 1s var(--ease-out);
}

.list-card-actions {
  display: flex;
  gap: 8px;
}

.list-action-btn {
  flex: 1;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--dur-fast);
}

.list-action-btn.primary {
  background: var(--accent);
  color: var(--text-inverse);
}

.list-action-btn.primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.list-action-btn.secondary {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--bg-border);
}

.list-action-btn.secondary:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.list-card-dropdown {
  position: absolute;
  top: 48px;
  right: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  overflow: hidden;
  z-index: 10;
  animation: dropdownAppear var(--dur-fast) var(--ease-spring);
}

.card-dropdown-item {
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.card-dropdown-item.danger { color: var(--danger); }
.card-dropdown-item.danger:hover { background: var(--danger-muted); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 80px 40px;
  max-width: 400px;
  margin: 0 auto;
}

.empty-icon { font-size: 3.5rem; margin-bottom: 20px; }

.empty-state h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

/* Loading spinner */
.loading-spinner-wrap {
  display: flex;
  justify-content: center;
  padding: 60px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--bg-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spinLoader 0.8s linear infinite;
}

/* ─── Practice Page ────────────────────────────────────────────────────────── */
.practice-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px 40px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.back-btn {
  flex-shrink: 0;
}

.practice-list-info h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.practice-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Mode selector */
.mode-selector-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 40px 60px;
}

.mode-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.mode-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.mode-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--dur-med);
}

.mode-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.mode-icon { font-size: 2.5rem; }

.mode-card h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.mode-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex: 1;
}

.mode-select-btn {
  align-self: flex-start;
}

.practice-settings {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.setting-row {
  display: flex;
  align-items: center;
  gap: 20px;
}

.setting-row label {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 100px;
}

.toggle-group {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.toggle-btn {
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  transition: all var(--dur-fast);
}

.toggle-btn.active {
  background: var(--accent);
  color: var(--text-inverse);
  border-color: var(--accent);
}

.toggle-btn:not(.active):hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Practice mode common */
.practice-mode {
  max-width: 700px;
  margin: 0 auto;
  padding: 20px 40px 60px;
}

.fc-progress-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.fc-progress {
  flex: 1;
  height: 6px;
  background: var(--bg-border);
  border-radius: 3px;
  overflow: hidden;
}

.fc-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 3px;
  transition: width 0.5s var(--ease-out);
}

.fc-progress-text {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Flashcard */
.flashcard-scene {
  perspective: 1200px;
  cursor: pointer;
  margin-bottom: 20px;
}

.flashcard {
  width: 100%;
  aspect-ratio: 16/9;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.7s var(--ease-out);
}

.flashcard.flipped { transform: rotateY(180deg); }

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: var(--shadow-md);
}

.flashcard-back {
  transform: rotateY(180deg);
  background: var(--bg-elevated);
  border-color: var(--accent-glow);
}

.fc-word-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.fc-word {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  letter-spacing: -0.02em;
}

.flashcard-back .fc-word { color: var(--accent); }

.fc-example {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-align: center;
}

.fc-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin-bottom: 28px;
}

.fc-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.btn-fc {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--dur-fast);
}

.btn-fc-wrong {
  background: var(--danger-muted);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.3);
}

.btn-fc-wrong:hover {
  background: var(--danger);
  color: white;
  transform: translateY(-2px);
}

.btn-fc-flip {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--bg-border);
  padding: 12px 28px;
}

.btn-fc-flip:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-fc-correct {
  background: var(--success-muted);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.3);
}

.btn-fc-correct:hover {
  background: var(--success);
  color: white;
  transform: translateY(-2px);
}

/* Type mode */
.type-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
}

.type-question-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.type-question {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}

.type-input-wrap {
  display: flex;
  gap: 12px;
}

.type-input {
  flex: 1;
  padding: 13px 18px;
  background: var(--bg-elevated);
  border: 2px solid var(--bg-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--dur-fast);
  outline: none;
}

.type-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.type-input.correct {
  border-color: var(--success);
  box-shadow: 0 0 0 3px var(--success-muted);
}

.type-input.incorrect {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-muted);
  animation: shakeInput 0.4s var(--ease-out);
}

@keyframes shakeInput {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

.type-feedback {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  animation: fadeSlideUp var(--dur-fast);
}

.type-feedback.correct {
  background: var(--success-muted);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.2);
}

.type-feedback.incorrect {
  background: var(--danger-muted);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}

.type-feedback.partial {
  background: var(--accent-muted);
  color: var(--accent);
  border: 1px solid var(--accent-glow);
}

.type-next-wrap {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
}

.type-keyboard-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

kbd {
  display: inline-block;
  padding: 2px 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: 4px;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

/* Practice results */
.practice-results {
  max-width: 500px;
  margin: 0 auto;
  padding: 20px 40px 60px;
}

.results-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: scaleIn var(--dur-slow) var(--ease-spring);
}

.results-animation { margin-bottom: 20px; }

.results-emoji {
  font-size: 3.5rem;
  animation: bounceIn 0.6s var(--ease-spring);
}

@keyframes bounceIn {
  from { opacity: 0; transform: scale(0.3); }
  to { opacity: 1; transform: scale(1); }
}

.results-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 32px;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.result-stat {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  padding: 18px 12px;
}

.result-stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.result-stat span {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.wrong-words-list {
  text-align: left;
  margin-bottom: 28px;
}

.wrong-words-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.wrong-word-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--danger-muted);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  font-size: 0.84rem;
  border: 1px solid rgba(239,68,68,0.15);
}

.wrong-word-item .ww-word { font-weight: 600; color: var(--text-primary); }
.wrong-word-item .ww-answer { color: var(--text-secondary); }

.results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ─── Stats Page ───────────────────────────────────────────────────────────── */
.stats-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--dur-med);
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--bg-hover);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.stat-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.stats-detail-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.stats-card-full {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.stats-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--bg-border);
}

.placeholder-text {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  text-align: center;
  padding: 24px 0;
}

.hard-word-item,
.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--bg-border);
  font-size: 0.85rem;
}

.hard-word-item:last-child,
.session-item:last-child { border-bottom: none; }

.hw-word { font-weight: 600; color: var(--text-primary); }
.hw-miss {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--danger);
  background: var(--danger-muted);
  padding: 2px 8px;
  border-radius: 100px;
}

.si-info { color: var(--text-secondary); }
.si-score { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); }

/* ─── Delete modal ─────────────────────────────────────────────────────────── */
.small-modal { max-width: 380px; text-align: center; }

.delete-icon { font-size: 2.5rem; margin-bottom: 16px; }

.small-modal h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.small-modal p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ─── Toast notifications ──────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 340px;
  pointer-events: auto;
  animation: toastIn 0.4s var(--ease-spring);
  transition: all var(--dur-med);
}

.toast.removing {
  animation: toastOut 0.3s var(--ease-out) forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(40px) scale(0.9); }
}

.toast-icon { font-size: 1.2rem; flex-shrink: 0; }

.toast-message {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

.toast.success { border-color: rgba(34,197,94,0.3); }
.toast.error { border-color: rgba(239,68,68,0.3); }
.toast.info { border-color: rgba(99,102,241,0.3); }

/* ─── Utilities ────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; text-align: center; gap: 40px; padding: 60px 24px; }
  .hero-content { align-items: center; }
  .hero-sub { text-align: center; }
  .hero-visual { justify-content: center; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-detail-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --nav-h: 56px; }

  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  #navAuthBtn { display: none; }

  .hero { padding: 40px 20px 60px; }
  .hero-title { font-size: 2rem; }
  .hero-card-stack { width: 260px; height: 220px; }
  .demo-card-3, .demo-card-2, .demo-card-1 { width: 230px; height: 160px; }

  .features-grid { grid-template-columns: 1fr; }
  .steps-container { flex-direction: column; gap: 16px; }
  .step-arrow { transform: rotate(90deg); }

  .page-header { padding: 28px 20px 20px; }
  .upload-container { padding: 0 20px 40px; }
  .filter-bar { padding: 0 20px 16px; }
  .lists-grid { padding: 0 20px 40px; grid-template-columns: 1fr; }

  .preview-grid { grid-template-columns: 1fr; }
  .list-meta { grid-template-columns: 1fr; }
  .mode-cards { grid-template-columns: 1fr; }
  .setting-row { flex-direction: column; align-items: flex-start; }

  .practice-mode { padding: 16px 20px 40px; }
  .type-card { padding: 28px 20px; }
  .type-input-wrap { flex-direction: column; }

  .stats-grid { grid-template-columns: 1fr 1fr; padding: 0 20px 24px; }
  .stats-detail-grid { padding: 0 20px 40px; }

  .modal-card { padding: 28px 24px; border-radius: var(--radius-lg); }

  .results-stats { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .results-card { padding: 32px 24px; }

  .fc-buttons { gap: 8px; }
  .btn-fc { padding: 10px 14px; font-size: 0.8rem; }
}

@media (max-width: 480px) {
  .hero-stats { flex-direction: column; gap: 12px; }
  .hero-stat-divider { display: none; }
  .features-section { padding: 60px 20px; }
  .how-section { padding: 60px 20px; }
  .cta-banner { padding: 60px 20px; }
  .stats-grid { grid-template-columns: 1fr; }
  .results-stats { gap: 8px; }