/* ============================================================
   OpenSave — website styles
   Brand: violet gradient #9b7af7 → #6d43d6, dark local-first UI
   ============================================================ */

:root {
  --bg: #0b0a12;
  --bg-elev: #131120;
  --bg-card: rgba(255, 255, 255, 0.035);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(155, 122, 247, 0.35);

  --violet: #9b7af7;
  --violet-deep: #6d43d6;
  --violet-soft: rgba(155, 122, 247, 0.14);
  --grad: linear-gradient(135deg, #9b7af7 0%, #6d43d6 100%);

  --text: #eceaf6;
  --text-secondary: #a49fbd;
  --text-dim: #6f6a88;

  --ok: #4ade80;
  --warn: #fbbf24;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius: 14px;
  --ease: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--violet-deep); color: #fff; }

a { color: var(--violet); text-decoration: none; transition: var(--ease); }
a:hover { color: #b8a0ff; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--violet-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.4em;
}

/* ---------- ambient glows ---------- */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
.glow-1 { width: 900px; height: 900px; background: radial-gradient(circle, rgba(109,67,214,0.22) 0%, transparent 62%); top: -320px; right: -260px; }
.glow-2 { width: 780px; height: 780px; background: radial-gradient(circle, rgba(155,122,247,0.14) 0%, transparent 62%); top: 38%; left: -330px; }
.glow-3 { width: 820px; height: 820px; background: radial-gradient(circle, rgba(76,47,168,0.18) 0%, transparent 62%); bottom: -360px; right: 4%; }

/* ---------- navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(11, 10, 18, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 26px; width: auto; object-fit: contain; }
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo-text span { color: var(--violet); }

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 14.5px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); }
.github-link {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 15px;
  color: var(--text) !important;
}
.github-link:hover { border-color: var(--border-strong); background: var(--violet-soft); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--ease); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: 150px 24px 40px;
}
.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 600;
  color: var(--violet);
  background: var(--violet-soft);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 7px 15px;
  margin-bottom: 22px;
}
.badge-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 10px var(--ok);
  animation: pulse 2.2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.45; } }

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero-title span {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  font-size: 17.5px;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 30px;
}
.hero-subtitle strong { color: var(--text); }

.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 18px; }
.hero-ctas.center { justify-content: center; }

.btn-primary, .btn-secondary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15.5px;
  border-radius: 12px;
  padding: 13px 26px;
  transition: var(--ease);
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 28px rgba(109, 67, 214, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(109, 67, 214, 0.55); color: #fff; }
.btn-secondary {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--border-strong); background: var(--violet-soft); color: var(--text); }
.btn-ghost { color: var(--violet); padding: 13px 10px; }

.hero-meta { font-size: 13.5px; color: var(--text-dim); }

/* ---------- glass mockup ---------- */
.hero-mockup-container { perspective: 1400px; }
.glass-mockup {
  background: rgba(19, 17, 32, 0.75);
  border: 1px solid var(--border);
  border-radius: 18px;
  backdrop-filter: blur(20px);
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(155,122,247,0.06) inset;
  transform: rotateY(-7deg) rotateX(3deg);
  transition: transform 0.5s ease;
  overflow: hidden;
}
.glass-mockup:hover { transform: rotateY(-2deg) rotateX(1deg); }

.mockup-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.mockup-dots { display: flex; gap: 6px; }
.mockup-dots span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.14); }
.mockup-dots span:first-child { background: #ff5f57; }
.mockup-dots span:nth-child(2) { background: #febc2e; }
.mockup-dots span:nth-child(3) { background: #28c840; }
.mockup-title { font-size: 12.5px; color: var(--text-dim); font-family: var(--font-mono); }

.mockup-body { display: flex; min-height: 330px; }
.mockup-sidebar {
  width: 128px;
  border-right: 1px solid var(--border);
  padding: 12px 8px;
  display: flex; flex-direction: column; gap: 4px;
  flex-shrink: 0;
}
.sidebar-item {
  font-size: 12px;
  color: var(--text-dim);
  border-radius: 8px;
  padding: 8px 10px;
  white-space: nowrap;
}
.sidebar-item.active { background: var(--violet-soft); color: var(--violet); font-weight: 600; }

.mockup-content { flex: 1; padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.mockup-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  flex: 1;
}
.mockup-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  display: flex; flex-direction: column;
}
.card-cover {
  height: 56px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.04em;
}
.cover-1 { background: linear-gradient(135deg, #b8892f, #6b4a10); }
.cover-2 { background: linear-gradient(135deg, #3d4f6d, #16202f); }
.cover-3 { background: linear-gradient(135deg, #7a2f45, #3d1020); }
.cover-4 { background: linear-gradient(135deg, #6d6d75, #2e2e35); }
.cover-5 { background: linear-gradient(135deg, #c33f38, #7c1f1a); }
.cover-6 { background: linear-gradient(135deg, #4a8f4d, #1e4a20); }

.card-info { padding: 7px 9px; }
.card-info h4 {
  font-size: 11px; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  margin-bottom: 4px;
}
.card-info small { color: var(--text-dim); font-weight: 400; }
.status-badge {
  font-size: 9.5px; font-weight: 600;
  border-radius: 999px;
  padding: 2px 8px;
}
.status-badge.synced { background: rgba(74, 222, 128, 0.12); color: var(--ok); }
.status-badge.syncing { background: rgba(251, 191, 36, 0.12); color: var(--warn); }
.status-badge.snapshot { background: var(--violet-soft); color: var(--violet); }

.mockup-toast {
  display: flex; align-items: center; gap: 8px;
  font-size: 11.5px;
  color: var(--text-secondary);
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.18);
  border-radius: 9px;
  padding: 8px 12px;
}
.toast-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 8px var(--ok); flex-shrink: 0; }

/* ---------- stats strip ---------- */
.stats-strip {
  max-width: 1050px;
  margin: 64px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.stat {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 14px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
}
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* ---------- sections ---------- */
.section { position: relative; z-index: 1; padding: 96px 24px; }
.section-tinted { background: linear-gradient(180deg, transparent, rgba(155,122,247,0.035), transparent); }
.section-container { max-width: 1200px; margin: 0 auto; }
.section-container.narrow { max-width: 820px; }
.section-container.center { text-align: center; }

.section-heading { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 14px;
}
.section-heading h2, .footer-cta h2, .oss-text h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.section-sub { font-size: 16.5px; color: var(--text-secondary); }

/* ---------- why ---------- */
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  max-width: 980px;
  margin: 0 auto;
}
.why-card {
  border-radius: var(--radius);
  padding: 30px 30px 26px;
  border: 1px solid var(--border);
  background: var(--bg-card);
}
.why-card.good { border-color: var(--border-strong); background: linear-gradient(160deg, rgba(155,122,247,0.09), rgba(155,122,247,0.02)); }
.why-card h3 {
  font-family: var(--font-display);
  font-size: 19px;
  margin-bottom: 16px;
}
.why-card.bad h3 { color: var(--text-dim); }
.why-card.good h3 { color: var(--violet); }
.why-card ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.why-card li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  color: var(--text-secondary);
}
.why-card.bad li::before { content: "✕"; position: absolute; left: 0; color: #f87171; font-weight: 700; }
.why-card.good li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.why-card.good li { color: var(--text); }
.why-card.good li em { color: var(--violet); font-style: normal; }

/* ---------- features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: var(--ease);
}
.feature-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  background: linear-gradient(160deg, rgba(155,122,247,0.07), rgba(255,255,255,0.02));
}
.feature-icon {
  font-size: 24px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--violet-soft);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  margin-bottom: 16px;
}
.feature-card h3 { font-family: var(--font-display); font-size: 17.5px; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); }
.feature-card strong, .feature-card em { color: var(--text); font-style: normal; }

/* ---------- how it works ---------- */
.how-steps {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin-bottom: 48px;
}
.how-step {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
}
.how-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad);
  color: #fff;
  border-radius: 10px;
  margin-bottom: 14px;
}
.how-step h3 { font-family: var(--font-display); font-size: 17px; margin-bottom: 7px; }
.how-step p { font-size: 13.5px; color: var(--text-secondary); }
.how-arrow {
  align-self: center;
  color: var(--violet);
  font-size: 22px;
  font-weight: 700;
  flex-shrink: 0;
}

.arch-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 34px;
  align-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 34px;
}
.arch-code { overflow-x: auto; }
.arch-code pre {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-secondary);
  white-space: pre;
}
.arch-notes h3 { font-family: var(--font-display); font-size: 20px; margin-bottom: 12px; }
.arch-notes p { font-size: 14.5px; color: var(--text-secondary); margin-bottom: 12px; }
.arch-notes strong { color: var(--text); }

/* ---------- open source ---------- */
.oss-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}
.oss-text p { font-size: 16px; color: var(--text-secondary); margin-bottom: 18px; }
.oss-text strong { color: var(--text); }
.oss-list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 26px; }
.oss-list li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  color: var(--text-secondary);
}
.oss-list li::before { content: "▸"; position: absolute; left: 4px; color: var(--violet); font-weight: 700; }

.oss-terminal {
  background: #0d0c16;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0,0,0,0.45);
}
.terminal-body {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.75;
  padding: 18px 20px;
  color: var(--text-secondary);
  white-space: pre-wrap;
  overflow-x: auto;
}
.t-prompt { color: var(--violet); font-weight: 600; }
.t-ok { color: var(--ok); }
.t-sync { color: var(--warn); }

/* ---------- download ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 34px;
}
.dl-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  transition: var(--ease);
}
.dl-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.dl-os { font-size: 34px; }
.dl-card h3 { font-family: var(--font-display); font-size: 20px; }
.dl-card p { font-size: 14px; color: var(--text-secondary); flex: 1; }
.dl-card .btn-primary { font-size: 14.5px; padding: 11px 22px; }
.dl-note { font-size: 12px; color: var(--text-dim); font-family: var(--font-mono); }
.dl-upgrade {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  font-size: 14.5px;
  color: var(--text-secondary);
  background: var(--violet-soft);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 18px 24px;
}
.dl-upgrade strong { color: var(--text); }

/* ---------- faq ---------- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 22px;
  transition: var(--ease);
}
.faq-item[open] { border-color: var(--border-strong); }
.faq-item summary {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 34px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px; top: 50%;
  transform: translateY(-50%);
  color: var(--violet);
  font-size: 22px;
  font-weight: 400;
  transition: var(--ease);
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 0 20px; font-size: 14.5px; color: var(--text-secondary); }

/* ---------- footer ---------- */
.footer-cta { padding-top: 40px; }
.footer-cta .section-sub { margin-bottom: 30px; }

.footer {
  border-top: 1px solid var(--border);
  padding: 44px 24px 36px;
  position: relative;
  z-index: 1;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  text-align: center;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 22px; }
.footer-links a { color: var(--text-secondary); font-size: 14px; }
.footer-links a:hover { color: var(--text); }
.footer-note { font-size: 13px; color: var(--text-dim); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1020px) {
  .hero-container { grid-template-columns: 1fr; gap: 44px; }
  .hero-content { text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-ctas { justify-content: center; }
  .glass-mockup { transform: none; max-width: 640px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .how-steps { flex-wrap: wrap; }
  .how-step { flex: 1 1 40%; }
  .how-arrow { display: none; }
  .arch-panel, .oss-panel { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(11, 10, 18, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 10px 24px 18px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; font-size: 16px; }
  .github-link { justify-content: center; margin-top: 8px; }
  .nav-toggle { display: flex; }

  .hero { padding-top: 120px; }
  .features-grid, .dl-grid, .why-grid { grid-template-columns: 1fr; }
  .how-step { flex: 1 1 100%; }
  .mockup-sidebar { display: none; }
  .section { padding: 68px 20px; }
}