/* Mnemonica Trainer - Game-like, responsive */
:root {
  --bg: #0f0e17;
  --surface: #1a1926;
  --surface-2: #252335;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --success: #10b981;
  --error: #ef4444;
  --text: #f4f3f6;
  --text-muted: #9b97a8;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Outfit', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* Header */
.header {
  background: rgba(15, 14, 23, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}

.logo img {
  vertical-align: middle;
  flex-shrink: 0;
}

.logo:hover {
  color: var(--accent-light);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--surface-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: nowrap;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--accent-light);
  background: rgba(124, 58, 237, 0.15);
}

.logout-form {
  display: inline;
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--surface-2);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font: inherit;
  transition: all 0.2s;
}

.btn-logout:hover {
  border-color: var(--error);
  color: var(--error);
}

.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px;
}

.footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Landing */
.landing {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.landing-content {
  text-align: center;
  padding: 40px 24px;
}

.landing-content h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  margin-bottom: 8px;
}

.tagline {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.landing-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #6d28d9);
  color: white;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.5);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.1);
}

.btn-secondary:hover {
  background: var(--surface);
  border-color: var(--accent);
}

.btn-block {
  width: 100%;
}

.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--surface-2);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* Auth */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 400px;
}

.auth-header {
  text-align: center;
  margin-bottom: 24px;
}

.auth-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.auth-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid rgba(255,255,255,0.06);
}

.auth-card h2 {
  margin-bottom: 24px;
  font-size: 1.25rem;
}

.auth-form .form-group {
  margin-bottom: 20px;
}

.auth-form label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: var(--text-muted);
}

.auth-form input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--surface-2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.auth-form .captcha input {
  max-width: 100px;
}

.auth-form .btn {
  margin-top: 8px;
}

.auth-footer {
  margin-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.auth-footer a {
  color: var(--accent-light);
  text-decoration: none;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.auth-hint {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

/* Play - Mode selection */
.play-container h1 {
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.mode-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
  transition: all 0.2s;
}

.mode-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.2);
}

.mode-btn {
  width: 100%;
  padding: 28px 20px;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
}

.mode-icon {
  font-size: 2rem;
}

.mode-label {
  font-weight: 600;
  font-size: 1rem;
}

.mode-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.mode-pro {
  border-color: rgba(251, 191, 36, 0.3);
}

.mode-pro:hover {
  border-color: #fbbf24;
}

/* Game - Question */
.game-container {
  max-width: 560px;
  margin: 0 auto;
}

.game-stats {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  padding: 16px;
  background: var(--surface);
  border-radius: var(--radius);
  flex-wrap: wrap;
}

.game-stats .stat {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.game-stats strong {
  color: var(--accent-light);
}

.game-question {
  margin-bottom: 32px;
}

.question-text {
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.question-display {
  font-size: 3rem;
  font-weight: 700;
  text-align: center;
  padding: 32px;
  background: linear-gradient(135deg, var(--surface), var(--surface-2));
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.question-display.card {
  font-size: 2.5rem;
  background: #fff;
  color: #1a1926;
  padding: 28px 48px;
  border-radius: 12px;
  border: 2px solid #e5e7eb;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  max-width: 180px;
  margin: 0 auto 8px;
  aspect-ratio: 2.5 / 3.5;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 140px;
}

.game-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-btn {
  padding: 16px 24px;
  background: var(--surface);
  border: 2px solid var(--surface-2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(124, 58, 237, 0.1);
}

.option-btn:disabled {
  opacity: 0.7;
  cursor: default;
}

.feedback {
  margin: 20px 0;
  padding: 16px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
}

.feedback.hidden {
  display: none;
}

.feedback.correct {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.feedback.incorrect {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

.finish-form {
  margin-top: 32px;
}

/* Mnemonica deck grid */
.mnemonica-container {
  margin-bottom: 40px;
}

.mnemonica-container h1 {
  margin-bottom: 8px;
}

.mnemonica-desc {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 12px;
}

.card-cell {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.2s;
}

.card-cell:hover {
  border-color: var(--accent);
  transform: scale(1.02);
}

.card-num {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.card-symbol {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Ranking */
.ranking-container h1 {
  margin-bottom: 8px;
}

.ranking-desc {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ranking-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.06);
}

.rank-pos {
  font-size: 1.25rem;
  font-weight: 600;
}

.rank-user {
  font-weight: 500;
}

.rank-score {
  color: var(--accent-light);
  font-weight: 600;
  font-family: var(--font-mono);
}

.no-data {
  color: var(--text-muted);
  padding: 40px;
  text-align: center;
}

.no-data a {
  color: var(--accent-light);
}

/* Sessions */
.sessions-container h1 {
  margin-bottom: 24px;
}

.sessions-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.session-item {
  padding: 16px 20px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.06);
  transition: transform 0.15s, box-shadow 0.15s;
}

.session-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.session-mode {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.session-stats {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.session-date {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 4px;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 12px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s, opacity 0.2s;
  }

  .nav.nav-open {
    max-height: 320px;
    opacity: 1;
  }

  .nav a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .logout-form {
    padding: 12px 16px;
  }

  .btn-logout {
    width: 100%;
    text-align: left;
    padding: 12px 16px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    position: relative;
  }

  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}