/* ExamSaathi Landing — Dark B&W · Inter Typography (TestPass style) */
:root {
  color-scheme: dark;
  --bg: #000000;
  --surface: #0d0d0d;
  --surface-2: #161616;
  --surface-3: #1f1f1f;
  --border: #2a2a2a;
  --border-light: #3a3a3a;
  --text: #ffffff;
  --text-secondary: #a3a3a3;
  --text-muted: #666666;
  --accent-soft: rgba(255, 255, 255, 0.08);
  --accent-hover: rgba(255, 255, 255, 0.14);
  --inverse: #000000;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.8);
  --radius: 14px;
  --radius-sm: 10px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.hidden { display: none !important; }

.page-shell {
  width: 100%;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  padding-top: max(12px, env(safe-area-inset-top));
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.logo-box {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--text);
  background: var(--bg);
  overflow: hidden;
  flex-shrink: 0;
}

.logo-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.logo-box-md {
  width: 44px;
  height: 44px;
}

.logo-box-lg {
  width: 52px;
  height: 52px;
  border-radius: 12px;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.brand-tag {
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.header-cta { flex-shrink: 0; }

/* ── Hero ── */
.hero {
  padding: 40px 16px 32px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border-light);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 14px;
}

.hero-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 28px;
  line-height: 1.65;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.stat-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  min-width: 100px;
}

.stat-val {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.stat-lbl {
  display: block;
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
  font-weight: 600;
}

/* ── Apps Section ── */
.apps-section {
  padding: 8px 16px 40px;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 18px;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.search-box { position: relative; width: 100%; }

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 12px 14px 12px 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  background: var(--surface-2);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

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

.search-box input:focus {
  border-color: var(--text);
  background: var(--surface);
}

/* ── App Grid ── */
.app-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.app-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.12s, background 0.15s;
}

.app-card:hover {
  border-color: var(--border-light);
  background: var(--surface-2);
  transform: translateY(-1px);
}

.app-card:active { transform: scale(0.995); }

.app-card-top {
  display: flex;
  gap: 14px;
  padding: 18px 16px 14px;
  align-items: flex-start;
}

.app-icon {
  flex-shrink: 0;
}

.app-info { flex: 1; min-width: 0; }

.app-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.app-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 5px;
  line-height: 1.5;
}

.app-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--surface-3);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.badge-free {
  background: var(--text);
  color: var(--inverse);
  border-color: var(--text);
  font-weight: 700;
}

.badge-live {
  border-color: var(--border-light);
  color: var(--text);
}

.app-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.app-url {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 70%;
}

.app-cta {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.app-cta svg { opacity: 0.7; }

/* ── Features ── */
.features {
  padding: 16px 16px 48px;
  border-top: 1px solid var(--border);
}

.feature-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
}

.feature-icon {
  font-size: 1.4rem;
  display: block;
  margin-bottom: 10px;
  opacity: 0.85;
}

.feature-card h4 {
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Empty ── */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 2rem;
  margin-bottom: 10px;
  opacity: 0.5;
}

/* ── Buttons ── */
.btn {
  padding: 12px 18px;
  min-height: 44px;
  border-radius: var(--radius-sm);
  border: none;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s, background 0.15s;
}

.btn:active { opacity: 0.85; }

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

.btn-primary:hover { background: #e5e5e5; }

.btn-sm {
  padding: 9px 14px;
  font-size: 0.82rem;
  min-height: 38px;
}

/* ── Footer ── */
.site-footer {
  padding: 24px 16px;
  padding-bottom: max(24px, var(--safe-bottom));
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 14px;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover { color: var(--text); }

/* ── Accessibility ── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── SEO Content ── */
.seo-content {
  padding: 32px 16px;
  border-top: 1px solid var(--border);
}

.seo-intro {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 12px;
  max-width: 720px;
}

.seo-intro strong {
  color: var(--text);
  font-weight: 600;
}

.exam-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.exam-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ── FAQ ── */
.faq-section {
  padding: 32px 16px 48px;
  border-top: 1px solid var(--border);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
  max-width: 720px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-size: 1.1rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item[open] summary::after { content: "−"; }

.faq-item p {
  padding: 0 16px 16px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Noscript fallback ── */
.noscript-apps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.noscript-apps a {
  display: block;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: 0.88rem;
}

/* ── Tablet ── */
@media (min-width: 640px) {
  .site-header { padding: 14px 24px; }
  .hero { padding: 56px 24px 40px; }
  .apps-section { padding: 8px 24px 48px; }
  .features { padding: 24px 24px 56px; }
  .seo-content { padding: 40px 24px; }
  .faq-section { padding: 40px 24px 56px; }
  .site-footer { padding: 28px 24px; }

  .section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .search-box { max-width: 320px; }

  .app-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
}

/* ── Desktop ── */
@media (min-width: 1024px) {
  .page-shell {
    border-left-color: var(--border);
    border-right-color: var(--border);
  }

  .site-header { padding: 16px 32px; }
  .hero { padding: 72px 32px 48px; }
  .apps-section { padding: 12px 32px 56px; }
  .features { padding: 32px 32px 64px; }
  .seo-content { padding: 48px 32px; }
  .faq-section { padding: 48px 32px 64px; }
  .site-footer { padding: 32px; }

  .hero-title-line {
    display: block;
  }

  .app-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}