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

    :root {
      --bg: #0a0a0f;
      --surface: #13131a;
      --surface2: #1c1c26;
      --border: rgba(255,255,255,0.08);
      --border-hover: rgba(255,255,255,0.16);
      --text: #f0ede8;
      --muted: rgba(240,237,232,0.5);
      --accent: #e8c547;
      --accent2: #ff6b6b;
      --accent3: #6bcfff;
      --green: #6bffb8;
      --radius: 12px;
      --radius-lg: 20px;
    }

    html { scroll-behavior: smooth; }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: 'DM Sans', sans-serif;
      min-height: 100vh;
      overflow-x: hidden;
    }

    /* Background grid */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 960px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 1;
    }

    /* HEADER */
    header {
      padding: 32px 0 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .logo-word {
      font-family: 'Playfair Display', serif;
      font-size: 22px;
      font-weight: 900;
      letter-spacing: -0.5px;
      color: var(--text);
    }

    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      margin-bottom: 2px;
      flex-shrink: 0;
    }

    nav { display: flex; gap: 4px; }

    .nav-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      padding: 8px 16px;
      border-radius: 8px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 13px;
      transition: all 0.2s;
    }

    .nav-btn:hover, .nav-btn.active {
      border-color: var(--border-hover);
      color: var(--text);
      background: var(--surface);
    }

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

    /* MODE TABS */
    .mode-tabs {
      display: flex;
      gap: 8px;
      margin-bottom: 32px;
    }

    .mode-tab {
      flex: 1;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--muted);
      padding: 14px 12px;
      border-radius: var(--radius);
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 13px;
      font-weight: 500;
      transition: all 0.25s;
      text-align: center;
    }

    .mode-tab .tab-icon { font-size: 20px; display: block; margin-bottom: 4px; }

    .mode-tab:hover { border-color: var(--border-hover); color: var(--text); }

    .mode-tab.active {
      background: var(--surface2);
      border-color: var(--accent);
      color: var(--accent);
    }

    /* FILTERS ROW */
    .filters {
      display: flex;
      gap: 10px;
      margin-bottom: 28px;
      flex-wrap: wrap;
    }

    .filter-group { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 140px; }
    .filter-label { font-size: 11px; font-weight: 500; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }

    select {
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--text);
      padding: 10px 14px;
      border-radius: 10px;
      font-family: 'DM Sans', sans-serif;
      font-size: 13px;
      cursor: pointer;
      outline: none;
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24'%3E%3Cpath fill='rgba(240,237,232,0.4)' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 12px center;
      padding-right: 32px;
      transition: border-color 0.2s;
      width: 100%;
    }

    select:focus { border-color: var(--accent); }
    select option { background: #1c1c26; }

    /* MAIN CARD */
    .main-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 48px 40px;
      text-align: center;
      margin-bottom: 24px;
      position: relative;
      overflow: hidden;
      min-height: 280px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      transition: border-color 0.3s;
    }

    .main-card::before {
      content: '';
      position: absolute;
      top: -80px;
      left: 50%;
      transform: translateX(-50%);
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(232,197,71,0.06) 0%, transparent 70%);
      pointer-events: none;
    }

    .topic-label {
      font-size: 11px;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .topic-text {
      font-family: 'Playfair Display', serif;
      font-size: 28px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--text);
      max-width: 640px;
      margin-bottom: 24px;
      transition: opacity 0.3s;
    }

    .topic-meta {
      display: flex;
      gap: 8px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .badge {
      font-size: 11px;
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 20px;
      text-transform: capitalize;
    }

    .badge-cat { background: rgba(107,207,255,0.12); color: var(--accent3); border: 1px solid rgba(107,207,255,0.2); }
    .badge-easy { background: rgba(107,255,184,0.1); color: var(--green); border: 1px solid rgba(107,255,184,0.2); }
    .badge-medium { background: rgba(232,197,71,0.1); color: var(--accent); border: 1px solid rgba(232,197,71,0.2); }
    .badge-hard { background: rgba(255,107,107,0.1); color: var(--accent2); border: 1px solid rgba(255,107,107,0.2); }

    /* Example / Angle */
    .topic-hint {
      display: none;
      margin-top: 20px;
      padding: 16px 20px;
      background: var(--surface2);
      border-radius: var(--radius);
      border-left: 3px solid var(--accent);
      text-align: left;
      max-width: 560px;
      width: 100%;
    }

    .topic-hint.visible { display: block; }
    .hint-label { font-size: 11px; font-weight: 500; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
    .hint-text { font-size: 14px; color: var(--muted); line-height: 1.6; font-style: italic; }

    /* SPIN BUTTON */
    .spin-btn {
      background: var(--accent);
      color: #0a0a0f;
      border: none;
      padding: 18px 48px;
      border-radius: 14px;
      font-family: 'DM Sans', sans-serif;
      font-size: 15px;
      font-weight: 700;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: all 0.2s;
      margin-bottom: 12px;
    }

    .spin-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(232,197,71,0.25); }
    .spin-btn:active { transform: translateY(0); }
    .spin-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
    .spin-btn.spinning { animation: pulse 0.5s ease-in-out infinite alternate; }

    @keyframes pulse { from { opacity: 0.7; } to { opacity: 1; } }

    .sub-actions {
      display: flex;
      gap: 8px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .ghost-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      padding: 10px 20px;
      border-radius: 10px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 13px;
      transition: all 0.2s;
    }

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

    /* FRAMEWORKS SECTION */
    .section-title {
      font-size: 13px;
      font-weight: 500;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 12px;
    }

    .frameworks {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 12px;
      margin-bottom: 28px;
    }

    .fw-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 16px;
      cursor: pointer;
      transition: all 0.2s;
      text-align: left;
    }

    .fw-card:hover { border-color: var(--border-hover); }
    .fw-card.active { border-color: var(--accent); background: rgba(232,197,71,0.06); }

    .fw-name {
      font-family: 'Playfair Display', serif;
      font-size: 18px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 4px;
    }

    .fw-desc { font-size: 12px; color: var(--muted); line-height: 1.5; }

    .fw-expanded {
      display: none;
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid var(--border);
    }

    .fw-expanded.open { display: block; }

    .fw-item {
      font-size: 13px;
      color: var(--text);
      padding: 4px 0;
      line-height: 1.5;
    }

    .fw-item strong { color: var(--accent); }

    /* TIMER */
    .timer-section {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      margin-bottom: 24px;
    }

    .timer-display {
      font-family: 'Playfair Display', serif;
      font-size: 72px;
      font-weight: 900;
      color: var(--text);
      letter-spacing: -2px;
      line-height: 1;
      margin-bottom: 8px;
      transition: color 0.3s;
    }

    .timer-display.urgent { color: var(--accent2); }
    .timer-display.done { color: var(--green); }

    .timer-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 24px; }

    .timer-controls { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

    .timer-btn {
      background: var(--surface2);
      border: 1px solid var(--border);
      color: var(--text);
      padding: 12px 28px;
      border-radius: 10px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 14px;
      font-weight: 500;
      transition: all 0.2s;
    }

    .timer-btn:hover { border-color: var(--border-hover); }
    .timer-btn.primary { background: var(--accent); color: #0a0a0f; border-color: transparent; font-weight: 700; }
    .timer-btn.primary:hover { box-shadow: 0 4px 16px rgba(232,197,71,0.3); }

    .timer-presets { display: flex; gap: 8px; justify-content: center; margin-bottom: 20px; }

    .preset-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      padding: 6px 14px;
      border-radius: 8px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 12px;
      transition: all 0.2s;
    }

    .preset-btn:hover, .preset-btn.active { border-color: var(--accent); color: var(--accent); }

    /* PROGRESS RING */
    .progress-ring-wrap {
      position: relative;
      width: 180px;
      height: 180px;
      margin: 0 auto 20px;
    }

    .progress-ring {
      width: 180px;
      height: 180px;
      display: block;
      transform: rotate(-90deg);
    }
    .progress-ring-bg { fill: none; stroke: var(--surface2); stroke-width: 6; }
    .progress-ring-fill { fill: none; stroke: var(--accent); stroke-width: 6; stroke-linecap: round; transition: stroke-dashoffset 0.5s linear, stroke 0.3s; }

    .progress-inner {
      position: absolute;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* LANG SELECTOR */
    .lang-flag { font-size: 18px; }

    /* STREAK */
    .stats-row {
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      margin-bottom: 28px;
    }

    .stat-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 16px;
      text-align: center;
    }

    .stat-number { font-family: 'Playfair Display', serif; font-size: 28px; font-weight: 700; color: var(--accent); }
    .stat-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 2px; }

    /* RATING */
    .rating-row { display: flex; gap: 8px; justify-content: center; margin-top: 16px; }

    .star-btn {
      background: transparent;
      border: none;
      font-size: 24px;
      cursor: pointer;
      transition: transform 0.15s;
      color: var(--border);
      filter: grayscale(1);
    }

    .star-btn:hover, .star-btn.lit { color: var(--accent); filter: none; transform: scale(1.2); }

    /* LOADING */
    .loading-topic {
      font-family: 'Playfair Display', serif;
      font-size: 22px;
      color: var(--muted);
      animation: shimmer 1.5s ease-in-out infinite;
    }

    @keyframes shimmer {
      0%, 100% { opacity: 0.4; }
      50% { opacity: 0.8; }
    }

    /* TOAST */
    .toast {
      position: fixed;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%) translateY(80px);
      background: var(--surface2);
      border: 1px solid var(--border-hover);
      color: var(--text);
      padding: 12px 24px;
      border-radius: 10px;
      font-size: 14px;
      z-index: 100;
      transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

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

    /* PANEL TRANSITIONS */
    .panel { display: none; }
    .panel.active { display: block; }

    /* SAMPLE ANSWER */
    .sample-overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.75);
      z-index: 50;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .sample-overlay.show { display: flex; }

    .sample-modal {
      background: var(--surface);
      border: 1px solid var(--border-hover);
      border-radius: var(--radius-lg);
      padding: 32px;
      max-width: 580px;
      width: 100%;
      max-height: 80vh;
      overflow-y: auto;
    }

    .sample-modal h3 {
      font-family: 'Playfair Display', serif;
      font-size: 20px;
      margin-bottom: 16px;
      color: var(--text);
    }

    .sample-para { font-size: 14px; color: var(--muted); line-height: 1.75; margin-bottom: 12px; }

    .close-modal {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      padding: 10px 20px;
      border-radius: 8px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 13px;
      margin-top: 16px;
      transition: all 0.2s;
    }

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

    /* VOCAB MODE */
    .vocab-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 48px 40px;
      text-align: center;
      margin-bottom: 24px;
      min-height: 220px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .vocab-word {
      font-family: 'Playfair Display', serif;
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }

    .vocab-pos { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 16px; }
    .vocab-def { font-size: 16px; color: var(--text); line-height: 1.6; max-width: 480px; margin-bottom: 12px; }
    .vocab-example { font-size: 14px; color: var(--muted); font-style: italic; }

    /* RESPONSIVE */
    @media (max-width: 600px) {
      .topic-text { font-size: 22px; }
      .timer-display { font-size: 56px; }
      .main-card { padding: 32px 20px; }
      .filters { gap: 8px; }
      .filter-group { min-width: 100%; }
    }
  

/* Topic reveal */
.topic-reveal {
  animation: topicReveal 0.55s ease-out both;
}

@keyframes topicReveal {
  0% { opacity: 0; transform: translateY(12px) scale(0.98); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.rolling-dice {
  display: inline-block;
  margin-right: 8px;
  animation: rollDice 0.7s ease-in-out infinite;
}

@keyframes rollDice {
  0% { transform: rotate(0deg) translateY(0); }
  50% { transform: rotate(180deg) translateY(-2px); }
  100% { transform: rotate(360deg) translateY(0); }
}

.loading-dots {
  display: inline-block;
  width: 24px;
  overflow: hidden;
  vertical-align: bottom;
  animation: loadingDots 1.2s steps(4, end) infinite;
}

@keyframes loadingDots {
  0% { width: 0; }
  75% { width: 24px; }
  100% { width: 24px; }
}

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

.site-footer {
  width: 100%;
  margin-top: 60px;
  padding: 30px 20px;
  box-sizing: border-box;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  margin-bottom: 18px;
}

.footer-brand strong {
  display: block;
  margin-bottom: 5px;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 20px;
  color: var(--text);
}

.footer-brand span {
  font-size: 13px;
  color: var(--muted);
}

.footer-links {
  margin-bottom: 18px;
}

.footer-links a {
  display: inline-block;
  margin: 0 10px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--accent);
  text-decoration: underline;
}

.footer-credit {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--muted);
}

.footer-credit strong {
  color: var(--text);
}

.footer-copy {
  margin: 0;
  font-size: 11px;
  color: var(--muted);
  opacity: 0.75;
}

/* Mobile */
@media screen and (max-width: 600px) {
  .site-footer {
    margin-top: 40px;
    padding: 25px 15px;
  }

  .footer-links a {
    margin: 5px 8px;
  }
}