/* ===== AI Metadata Inspector landing page =====
   Palette synced with Gaurox design system
   PrimaryBlue   #8EBAF3
   SecondaryBlue #4D79B4
   PageBg        #F5F7FB
   Surface       #FFFFFF
   SurfaceBorder #D8E2F2
   TextPrimary   #1F283A
   TextSecondary #525E73
   TextMuted     #7A8495
   AccentSoft    #ECF3FF
=================================== */

:root {
  --primary-blue: #8EBAF3;
  --secondary-blue: #4D79B4;
  --secondary-blue-hover: #3F6699;
  --page-bg: #F5F7FB;
  --surface: #FFFFFF;
  --surface-border: #D8E2F2;
  --text-primary: #1F283A;
  --text-secondary: #525E73;
  --text-muted: #7A8495;
  --accent-soft: #ECF3FF;
  --accent-soft-hover: #E4EEFE;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px rgba(31, 40, 58, 0.05), 0 1px 3px rgba(31, 40, 58, 0.06);
  --shadow-md: 0 6px 24px rgba(31, 40, 58, 0.08);
  --shadow-lg: 0 20px 60px rgba(31, 40, 58, 0.12);

  --container: 1140px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--page-bg);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--secondary-blue); text-decoration: none; }
a:hover { color: var(--secondary-blue-hover); }

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

/* ===== Nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 247, 251, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--surface-border);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.4);
}
.brand-name { font-size: 1.05rem; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta {
  background: var(--secondary-blue);
  color: #fff !important;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem !important;
  transition: background .15s ease;
}
.nav-cta:hover { background: var(--secondary-blue-hover); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: -0.005em;
  transition: transform .12s ease, background .15s ease, color .15s ease, border-color .15s ease;
  border: 1.5px solid transparent;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--secondary-blue);
  color: #fff;
}
.btn-primary:hover { background: var(--secondary-blue-hover); color: #fff; }
.btn-outline {
  background: var(--surface);
  border-color: var(--secondary-blue);
  color: var(--secondary-blue);
}
.btn-outline:hover {
  background: var(--accent-soft);
  color: var(--secondary-blue-hover);
  border-color: var(--secondary-blue-hover);
}

/* ===== Hero ===== */
.hero {
  padding: 72px 0 64px;
  background:
    radial-gradient(ellipse at top, rgba(142,186,243,0.22), transparent 60%),
    var(--page-bg);
}
.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--text-primary);
  font-weight: 800;
}
.hero-sub {
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 28px;
}
.hero-sub strong { color: var(--text-primary); font-weight: 600; }

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--surface-border);
  background: var(--surface);
  margin: 0 auto;
  max-width: 900px;
}
.hero-media img { width: 100%; }

.hero-badges {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}
.hero-badges .dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary-blue);
  margin-right: 8px;
  vertical-align: middle;
}

/* ===== Section title ===== */
.section-title {
  font-size: clamp(1.55rem, 2.5vw, 2.1rem);
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 12px;
  text-align: center;
}
.section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin: 0 auto 40px;
  max-width: 640px;
}

/* ===== Why ===== */
.why { padding: 80px 0; }
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.why-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.why-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.why-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.97rem;
}

/* ===== Demos ===== */
.demos { padding: 80px 0; background: var(--surface); border-top: 1px solid var(--surface-border); border-bottom: 1px solid var(--surface-border); }
.demo-row {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: center;
  margin: 56px 0;
}
.demo-row.reverse { grid-template-columns: 1fr 1.15fr; }
.demo-row.reverse .demo-media { order: 2; }
.demo-row.reverse .demo-text { order: 1; }

.demo-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-md);
  background: var(--accent-soft);
}
.demo-text h3 {
  font-size: 1.55rem;
  margin: 0 0 12px;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}
.demo-text p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.02rem;
}
.demo-tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--secondary-blue);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
  border: 1px solid var(--surface-border);
}

/* ===== Features catalog ===== */
.features { padding: 80px 0; background: var(--surface); border-top: 1px solid var(--surface-border); border-bottom: 1px solid var(--surface-border); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.features-col {
  background: var(--page-bg);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 28px;
}
.features-col h3 {
  margin: 0 0 16px;
  color: var(--secondary-blue);
  font-size: 1.1rem;
  letter-spacing: -0.005em;
}
.features-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.features-col li {
  padding: 8px 0;
  border-top: 1px solid var(--surface-border);
  color: var(--text-secondary);
  font-size: 0.97rem;
}
.features-col li:first-child { border-top: none; }

/* ===== Formats ===== */
.formats { padding: 64px 0; }
.formats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 40px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}
.format-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.format-card h3 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  color: var(--secondary-blue);
  display: flex;
  align-items: center;
  gap: 10px;
}
.format-badge {
  display: inline-block;
  background: var(--secondary-blue);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 6px;
}
.format-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.format-card li {
  padding: 7px 0;
  border-top: 1px solid var(--surface-border);
  color: var(--text-secondary);
  font-size: 0.96rem;
}
.format-card li:first-child { border-top: none; }

/* ===== Gallery ===== */
.gallery { padding: 80px 0; }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.gallery-grid figure {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease;
  cursor: zoom-in;
}
.gallery-grid figure:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.gallery-grid figure:focus-visible {
  outline: 3px solid rgba(77, 121, 180, 0.35);
  outline-offset: 3px;
}
.gallery-grid img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--accent-soft);
}
.gallery-grid figcaption {
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--surface-border);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .18s ease, visibility .18s ease;
  z-index: 100;
}
.lightbox.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.82);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.lightbox-dialog {
  position: relative;
  z-index: 1;
  width: min(1100px, 100%);
  max-height: calc(100vh - 48px);
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.lightbox-image {
  width: 100%;
  max-height: calc(100vh - 140px);
  object-fit: contain;
  background: #0f1724;
}
.lightbox-caption {
  margin: 0;
  padding: 14px 18px 18px;
  text-align: center;
  color: var(--text-secondary);
  font-weight: 500;
}
.lightbox-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.72);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background .15s ease, transform .15s ease;
}
.lightbox-close:hover { background: rgba(17, 24, 39, 0.9); }
.lightbox-close:active { transform: scale(0.96); }

/* ===== Tech ===== */
.tech { padding: 72px 0; background: var(--surface); border-top: 1px solid var(--surface-border); }
.tech-list {
  list-style: none;
  padding: 0;
  margin: 24px auto 0;
  max-width: 720px;
}
.tech-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--surface-border);
  color: var(--text-secondary);
}
.tech-list li:last-child { border-bottom: none; }
.tech-list code {
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--secondary-blue);
}

/* ===== Donate ===== */
.donate { padding: 64px 0 80px; }
.donate-card {
  background: var(--accent-soft);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}
.donate-card h3 {
  margin: 0 0 8px;
  color: var(--text-primary);
  font-size: 1.25rem;
}
.donate-card p {
  margin: 0 0 20px;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

/* ===== Footer ===== */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--surface-border);
  padding: 32px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-weight: 600;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
}
.footer-links a:hover { color: var(--text-primary); }
.footer-copy {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  width: 100%;
  text-align: center;
  padding-top: 12px;
  border-top: 1px solid var(--surface-border);
  margin-top: 12px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .demo-row, .demo-row.reverse {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .demo-row.reverse .demo-media,
  .demo-row.reverse .demo-text { order: initial; }
}

@media (max-width: 720px) {
  .hero { padding: 48px 0 40px; }
  .why, .demos, .features, .gallery, .tech { padding: 56px 0; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .why-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .formats-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-badges { gap: 14px; font-size: 0.88rem; }
  .donate-card { padding: 28px 20px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .lightbox { padding: 12px; }
  .lightbox-dialog { max-height: calc(100vh - 24px); }
  .lightbox-image { max-height: calc(100vh - 112px); }
}

@media (max-width: 420px) {
  .gallery-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .hero-cta { flex-direction: column; align-items: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}