/* ============================================
   Interview Vault — Stylesheet
   Dark-first, responsive, glassmorphism cards
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --transition: 0.25s cubic-bezier(.4,0,.2,1);
  --shadow-card: 0 8px 32px rgba(0,0,0,.25);
  --max-width: 1200px;
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: rgba(30, 37, 48, 0.65);
  --bg-card-hover: rgba(40, 50, 65, 0.8);
  --bg-glass: rgba(255,255,255,0.04);
  --border-color: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --badge-green-bg: rgba(63,185,80,0.15);
  --badge-yellow-bg: rgba(210,153,34,0.15);
  --badge-red-bg: rgba(248,81,73,0.15);
  --badge-selected-bg: rgba(63,185,80,0.25);
  --badge-notselected-bg: rgba(248,81,73,0.18);
  --code-bg: #1a1f2b;
  --header-bg: rgba(13,17,23,0.85);
  --hero-gradient: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #1a2332 100%);
  --card-glow: rgba(88,166,255,0.08);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-card: rgba(255,255,255,0.7);
  --bg-card-hover: rgba(255,255,255,0.9);
  --bg-glass: rgba(0,0,0,0.02);
  --border-color: rgba(0,0,0,0.1);
  --border-hover: rgba(0,0,0,0.2);
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-muted: #8b949e;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --green: #1a7f37;
  --yellow: #9a6700;
  --red: #cf222e;
  --badge-green-bg: rgba(26,127,55,0.12);
  --badge-yellow-bg: rgba(154,103,0,0.12);
  --badge-red-bg: rgba(207,34,46,0.12);
  --badge-selected-bg: rgba(26,127,55,0.2);
  --badge-notselected-bg: rgba(207,34,46,0.15);
  --code-bg: #f0f3f6;
  --header-bg: rgba(255,255,255,0.85);
  --hero-gradient: linear-gradient(135deg, #f6f8fa 0%, #ffffff 50%, #eef2f7 100%);
  --card-glow: rgba(9,105,218,0.06);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ---------- Sticky Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition), border-color var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition);
}

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

.logo-icon { font-size: 1.5rem; }

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

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.nav-link:hover { color: var(--text-primary); }

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  position: relative;
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: rotate(20deg);
}

.theme-icon { font-size: 1.1rem; position: absolute; transition: opacity var(--transition); }

[data-theme="dark"] .theme-icon.sun  { opacity: 1; }
[data-theme="dark"] .theme-icon.moon { opacity: 0; }
[data-theme="light"] .theme-icon.sun  { opacity: 0; }
[data-theme="light"] .theme-icon.moon { opacity: 1; }

/* ---------- Hero Section ---------- */
.hero {
  background: var(--hero-gradient);
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 300px at 20% 50%, var(--card-glow), transparent),
    radial-gradient(ellipse 500px 250px at 80% 40%, rgba(88,166,255,0.04), transparent);
  pointer-events: none;
}

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

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* ---------- Search Bar ---------- */
.search-section {
  padding: 0 0 20px;
  position: relative;
  z-index: 1;
}

.search-wrapper {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 16px 20px 16px 50px;
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition);
  outline: none;
}

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

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88,166,255,0.15);
}

/* ---------- Filters ---------- */
.filters-section {
  padding: 20px 0 40px;
}

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 14px;
}

.filters-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
  margin-bottom: 10px;
}

.filter-btn, .difficulty-filter-btn {
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover, .difficulty-filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(88,166,255,0.08);
}

.filter-btn.active, .difficulty-filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ---------- Experiences Grid ---------- */
.experiences-section {
  padding: 0 0 80px;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  text-align: center;
  color: var(--text-primary);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

/* ---------- Experience Card (Glassmorphism) ---------- */
.experience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all 0.35s cubic-bezier(.4,0,.2,1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.experience-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: radial-gradient(ellipse at top left, var(--card-glow), transparent 70%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.experience-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), 0 0 40px var(--card-glow);
}

.experience-card:hover::before { opacity: 1; }

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

.card-company {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-role {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.card-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 18px;
}

.card-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.card-meta-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.card-meta-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 100px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.card-footer {
  margin-top: auto;
}

.read-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  width: 100%;
  justify-content: center;
}

.read-btn:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(88,166,255,0.3);
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-easy {
  background: var(--badge-green-bg);
  color: var(--green);
}

.badge-medium {
  background: var(--badge-yellow-bg);
  color: var(--yellow);
}

.badge-hard {
  background: var(--badge-red-bg);
  color: var(--red);
}

.badge-result {
  margin-left: 8px;
}

.badge-result-selected {
  background: var(--badge-selected-bg);
  color: var(--green);
}

.badge-result-not-selected, .badge-result-rejected {
  background: var(--badge-notselected-bg);
  color: var(--red);
}

.badge-result-in-process, .badge-result-pending {
  background: var(--badge-yellow-bg);
  color: var(--yellow);
}

/* ---------- No Results ---------- */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 1.1rem;
  display: none;
}

/* ---------- Experience Detail Page ---------- */
.experience-detail {
  padding: 40px 0 80px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 32px;
  transition: color var(--transition);
}

.back-link:hover { color: var(--accent); }

.experience-hero {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  margin-bottom: 40px;
}

.experience-hero-top {
  margin-bottom: 16px;
}

.experience-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 24px;
}

.experience-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.meta-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.experience-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- Experience Content (Markdown) ---------- */
.experience-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.experience-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.experience-content h2:first-child { margin-top: 0; }

.experience-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.experience-content p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.experience-content ul, .experience-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-secondary);
}

.experience-content li { margin-bottom: 6px; line-height: 1.7; }

.experience-content strong { color: var(--text-primary); font-weight: 600; }

.experience-content a { color: var(--accent); text-decoration: underline; }

.experience-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--bg-glass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* Code blocks */
.experience-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--accent);
}

.experience-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  line-height: 1.6;
}

.experience-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

/* Details / expandable */
.experience-content details {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 16px 0;
  transition: all var(--transition);
}

.experience-content details[open] {
  border-color: var(--accent);
}

.experience-content details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.experience-content details summary::before {
  content: '▶';
  font-size: 0.7em;
  transition: transform var(--transition);
}

.experience-content details[open] summary::before {
  transform: rotate(90deg);
}

.experience-content details summary::-webkit-details-marker { display: none; }

.experience-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 32px 0;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0;
  transition: background var(--transition), border-color var(--transition);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

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

.footer-author {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.coffee-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #ff813f, #e65c00);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
}

.coffee-btn:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 92, 0, 0.35);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero { padding: 70px 0 50px; }

  .experience-grid {
    grid-template-columns: 1fr;
  }

  .experience-hero { padding: 24px; }

  .experience-content { padding: 24px; }

  .experience-meta-grid {
    grid-template-columns: 1fr 1fr;
  }

  .header-nav { gap: 14px; }

  .filters-row { gap: 8px; }

  .filter-btn, .difficulty-filter-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .header-inner { height: 56px; }

  .logo { font-size: 1.1rem; }

  .hero h1 { font-size: 1.6rem; }

  .experience-meta-grid {
    grid-template-columns: 1fr;
  }

  .card-meta {
    grid-template-columns: 1fr;
  }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.experience-card {
  animation: fadeInUp 0.5s ease both;
}

.experience-card:nth-child(1) { animation-delay: 0.05s; }
.experience-card:nth-child(2) { animation-delay: 0.1s; }
.experience-card:nth-child(3) { animation-delay: 0.15s; }
.experience-card:nth-child(4) { animation-delay: 0.2s; }
.experience-card:nth-child(5) { animation-delay: 0.25s; }
.experience-card:nth-child(6) { animation-delay: 0.3s; }
.experience-card:nth-child(7) { animation-delay: 0.35s; }
.experience-card:nth-child(8) { animation-delay: 0.4s; }
.experience-card:nth-child(9) { animation-delay: 0.45s; }

/* ---------- Share Experience CTA Nav Link ---------- */
.nav-link-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 6px 16px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.nav-link-cta:hover {
  background: var(--accent-hover);
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(88,166,255,0.3);
}

/* ---------- Contribute / Share Experience Page ---------- */
.contribute-hero {
  background: var(--hero-gradient);
  padding: 80px 0 40px;
  text-align: center;
}

.contribute-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contribute-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.contribute-section {
  padding: 40px 0 60px;
}

/* Form */
.contribute-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

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

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group .required {
  color: var(--red);
}

.form-group .hint {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.8rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  transition: all var(--transition);
  outline: none;
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88,166,255,0.12);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b949e' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

/* Form Section Headers */
.form-section-header {
  margin-top: 32px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.form-section-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.form-section-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Rounds */
.round-block {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  transition: border-color var(--transition);
}

.round-block:hover {
  border-color: var(--border-hover);
}

.round-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.round-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.remove-round-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 1.2rem;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.remove-round-btn:hover {
  border-color: var(--red);
  color: var(--red);
  background: var(--badge-red-bg);
}

/* Questions */
.question-block {
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
}

.question-block:first-child {
  border-top: none;
  padding-top: 8px;
}

.remove-question-btn {
  background: none;
  border: none;
  color: var(--red);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 0;
  margin-top: 4px;
  transition: opacity var(--transition);
}

.remove-question-btn:hover {
  opacity: 0.7;
}

/* Add Buttons */
.add-question-btn,
.add-round-btn {
  background: var(--bg-glass);
  border: 1px dashed var(--border-color);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  width: 100%;
  margin-top: 8px;
}

.add-question-btn:hover,
.add-round-btn:hover {
  border-color: var(--accent);
  background: rgba(88,166,255,0.08);
}

.add-round-btn {
  margin-top: 16px;
  margin-bottom: 8px;
}

/* Form Actions */
.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.form-actions button {
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-preview {
  background: var(--bg-glass);
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary);
}

.btn-preview:hover {
  border-color: var(--accent) !important;
  color: var(--accent);
}

.btn-download {
  background: var(--accent);
  color: #fff;
}

.btn-download:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(88,166,255,0.3);
}

.btn-copy {
  background: var(--green);
  color: #fff;
}

.btn-copy:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* Preview Section */
.preview-section {
  margin-top: 32px;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
}

.preview-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-close-preview {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: color var(--transition);
}

.btn-close-preview:hover {
  color: var(--red);
}

.preview-content {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--code-bg);
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
  border: none;
  border-radius: 0;
}

/* How To Section */
.contribute-howto {
  padding: 60px 0 80px;
}

.contribute-howto h2 {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: var(--text-primary);
}

.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.howto-step {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all 0.3s ease;
}

.howto-step:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 16px;
}

.howto-step h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.howto-step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.howto-step code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--accent);
}

/* Contribute page responsive */
@media (max-width: 768px) {
  .contribute-hero { padding: 60px 0 30px; }

  .contribute-form { padding: 24px; }

  .form-group-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions button {
    width: 100%;
  }

  .round-block { padding: 16px; }
}