/* ============================================================
   vix-site — light-first SaaS style
   Depends on tokens.css (linked before this file in HTML).
   ============================================================ */

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: var(--text-base);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img, svg { display: block; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: 0.2px;
}

.brand-mark {
  display: inline-flex;
  color: var(--primary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--dur-fast), background var(--dur-fast);
}

.nav-links a:hover { color: var(--text); background: var(--bg-soft); }
.nav-links a.active { color: var(--primary); background: var(--primary-soft); }

/* Icon buttons (theme toggle / hamburger) */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
}

.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface-hover); }

.nav-menu-btn { display: none; }

/* Theme toggle: show the icon of the theme to switch TO */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(72px, 12vw, 128px) 0 clamp(56px, 8vw, 88px);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(560px 300px at 50% -12%, var(--primary-glow), transparent 68%),
    radial-gradient(420px 240px at 88% 8%, color-mix(in srgb, var(--primary-glow) 45%, transparent), transparent 70%);
  opacity: 0.7;
}

.hero-inner {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--text-h1);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.hero-title .accent {
  background: linear-gradient(120deg, var(--primary), color-mix(in srgb, var(--primary) 62%, #9db4ff));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
  color: var(--text-muted);
}

.hero-actions {
  margin-top: var(--space-7);
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero-note {
  margin-top: var(--space-5);
  font-size: var(--text-xs);
  color: var(--text-faint);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: transform var(--dur-fast), box-shadow var(--dur-base),
    background var(--dur-fast), border-color var(--dur-fast), color var(--dur-fast);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-1);
}

.btn-ghost:hover { background: var(--surface-hover); border-color: var(--border-strong); }

.btn-sm { padding: 8px 16px; font-size: var(--text-sm); }

.btn[disabled],
.btn.disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none;
}

/* ---------- Sections ---------- */
.section { padding: var(--space-9) 0; }

.section-title {
  font-size: var(--text-h2);
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
}

.section-lead {
  margin: var(--space-3) auto 0;
  max-width: 620px;
  text-align: center;
  color: var(--text-muted);
}

/* ---------- Feature cards (2×2 bento-ish) ---------- */
.features-grid {
  margin-top: var(--space-8);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-7);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: var(--space-4);
}

.card h3 { font-size: var(--text-lg); font-weight: 650; margin-bottom: var(--space-2); }
.card p { color: var(--text-muted); font-size: var(--text-sm); }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: var(--space-7) 0 var(--space-6);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.footer-brand .brand-mark { color: var(--primary); }

.footer-desc { color: var(--text-faint); font-size: var(--text-sm); }

.footer-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

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

.footer-bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--text-faint);
}

/* ---------- Download page ---------- */
.download-main { padding: clamp(48px, 7vw, 80px) 0 96px; }

.download-head { margin-bottom: var(--space-7); text-align: center; }

.download-window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  padding: var(--space-8);
  min-height: 320px;
}

.dl-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-7);
}

.dl-app-name { font-size: var(--text-xl); font-weight: 700; }

.dl-app-version {
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
}

/* Platform cards */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  align-items: start;
}

.platform-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: border-color var(--dur-base), box-shadow var(--dur-base);
}

.platform-card.recommended {
  border-color: color-mix(in srgb, var(--primary) 45%, var(--border));
  box-shadow: 0 0 0 3px var(--primary-soft), var(--shadow-1);
}

.platform-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.platform-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  flex-shrink: 0;
}

.platform-name { font-weight: 650; font-size: var(--text-base); }

.platform-badge {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.platform-files { display: grid; gap: var(--space-3); }

.file-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

.file-name {
  font-size: var(--text-sm);
  font-weight: 600;
  word-break: break-all;
}

.file-sub {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-soft);
  color: var(--text-muted);
  font-size: var(--text-xs);
}

.file-chip.coming {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border));
  background: var(--primary-soft);
}

.sha-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: none;
  padding: 2px 4px;
  border-radius: 4px;
  font-family: inherit;
  font-size: var(--text-xs);
  color: var(--text-faint);
  cursor: pointer;
  transition: color var(--dur-fast);
}

.sha-btn:hover { color: var(--primary); }

.file-actions { display: flex; align-items: center; gap: var(--space-2); }
.file-actions .btn { flex: 1; }

/* Loading / error / empty states */
.load-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 72px 0;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.dl-error {
  text-align: center;
  padding: 56px 0;
  color: var(--danger-text);
}

.dl-error .error-detail {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-faint);
}

.dl-empty {
  text-align: center;
  padding: 56px 0;
  color: var(--text-muted);
}

.download-footnote {
  margin-top: var(--space-6);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--text-faint);
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.55s var(--ease-out), transform 0.55s var(--ease-out);
}

.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav-menu-btn { display: inline-flex; }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-6) var(--space-4);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-2);
    display: none;
  }

  .site-header.nav-open .nav-links { display: flex; }

  .nav-links a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }

  .features-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .download-window { padding: var(--space-6) var(--space-4); }
}

@media (max-width: 480px) {
  .hero-actions .btn { width: 100%; }
  .dl-meta { flex-direction: column; align-items: flex-start; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal { opacity: 1; transform: none; }
}