/* ============================================================
   DocuMind — Marketing Site Styles
   Dark navy tech theme (#00224d base, #0082c2 accent)
   ============================================================ */

:root {
  --bg-deep: #001633;
  --bg-navy: #00224d;
  --bg-panel: rgba(12, 120, 183, 0.07);
  --accent: #0082c2;
  --accent-2: #0c78b7;
  --accent-bright: #33a8e0;
  --text-hi: #e6f0f7;
  --text-mid: #a8c2d8;
  --text-lo: #6f8ba3;
  --border-soft: rgba(140, 190, 225, 0.14);
  --border-glow: rgba(51, 168, 224, 0.35);
  --radius: 14px;
  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei",
    "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.75;
  color: var(--text-mid);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 {
  color: var(--text-hi);
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 0.6em;
}

h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }
a { color: var(--accent-bright); text-decoration: none; }
img { max-width: 100%; height: auto; }

.container {
  width: min(1120px, 100% - 48px);
  margin-inline: auto;
}

/* ---------- 導航列 ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 18px 0;
  transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}

.nav.scrolled {
  padding: 10px 0;
  background: rgba(0, 22, 51, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--border-soft);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-hi);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.nav-logo { display: block; }

.nav-links {
  display: flex;
  gap: 26px;
  margin-left: auto;
}

.nav-links a {
  color: var(--text-mid);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-hi);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ---------- 按鈕 ---------- */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 4px 24px rgba(0, 130, 194, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 130, 194, 0.5);
}

.btn-ghost {
  color: var(--text-hi);
  border: 1px solid var(--border-glow);
  background: rgba(0, 130, 194, 0.06);
}

.btn-ghost:hover {
  background: rgba(0, 130, 194, 0.14);
  transform: translateY(-2px);
}

.btn-sm { padding: 8px 20px; font-size: 0.9rem; }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 160px 0 90px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(0, 130, 194, 0.22), transparent 70%),
    linear-gradient(180deg, var(--bg-navy) 0%, var(--bg-deep) 100%);
}

/* 背景網格（緩慢漂移） */
.hero-grid-overlay {
  position: absolute;
  inset: -60px;
  background-image:
    linear-gradient(rgba(140, 190, 225, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 190, 225, 0.055) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, #000 0%, transparent 75%);
  animation: gridDrift 36s linear infinite;
  pointer-events: none;
}

@keyframes gridDrift {
  from { transform: translate(0, 0); }
  to   { transform: translate(46px, 46px); }
}

/* 光暈（緩慢漂浮） */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}

.hero-glow-a {
  width: 480px; height: 480px;
  top: -160px; left: -120px;
  background: rgba(0, 130, 194, 0.18);
  animation: driftA 18s ease-in-out infinite;
}

.hero-glow-b {
  width: 420px; height: 420px;
  bottom: -200px; right: -100px;
  background: rgba(12, 120, 183, 0.14);
  animation: driftB 22s ease-in-out infinite;
}

@keyframes driftA {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(70px, 46px); }
}

@keyframes driftB {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(-60px, -40px); }
}

/* 浮動粒子 */
.hero-particles { position: absolute; inset: 0; pointer-events: none; }

.hero-particles i {
  position: absolute;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-bright);
  opacity: 0.5;
  animation: floatY 12s ease-in-out infinite;
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); opacity: 0.15; }
  50%      { transform: translateY(-42px); opacity: 0.55; }
}

.hero-inner { position: relative; }

.hero-row {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 56px;
}

.hero-eyebrow,
.section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-bright);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.hero-title {
  font-size: clamp(1.9rem, 4.4vw, 3.1rem);
  font-weight: 900;
  letter-spacing: 0.01em;
  margin-bottom: 0.5em;
}

.text-gradient {
  background: linear-gradient(100deg, #33a8e0 0%, #7cc9ee 50%, #0082c2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin: 0 0 32px;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 24px 60px rgba(0, 130, 194, 0.22));
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 0;
  padding: 28px 24px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: rgba(0, 34, 77, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero-stats dt {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text-hi);
}

.hero-stats dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-lo);
}

/* ---------- Section 通用 ---------- */

.section { padding: 110px 0; position: relative; }

.section-head {
  max-width: 760px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-lead { font-size: 1.08rem; }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.glass {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card {
  padding: 30px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 14px 44px rgba(0, 20, 45, 0.55);
}

.card p { margin: 0; font-size: 0.97rem; }

.card-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  color: var(--accent-bright);
  border-radius: 12px;
  background: rgba(0, 130, 194, 0.12);
  border: 1px solid var(--border-glow);
  transition: transform 0.25s ease, background 0.25s ease;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  transition: transform 0.25s ease;
}

.card:hover .card-icon {
  background: rgba(0, 130, 194, 0.2);
  transform: translateY(-2px);
}

.card:hover .card-icon svg {
  transform: scale(1.14) rotate(-5deg);
}

/* ---------- 資訊圖 ---------- */

.diagram {
  max-width: 1000px;
  margin: 0 auto 56px;
}

.diagram img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: rgba(0, 34, 77, 0.35);
  box-shadow: 0 20px 60px rgba(0, 20, 45, 0.45);
}

/* ---------- 運作流程 ---------- */

.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  counter-reset: step;
}

.flow-step {
  position: relative;
  padding: 26px 20px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.flow-step:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.flow-num {
  display: block;
  font-size: 2rem;
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--accent);
  margin-bottom: 12px;
}

.flow-step p { margin: 0; font-size: 0.92rem; }

/* ---------- 安全專區 ---------- */

.section-security {
  background:
    radial-gradient(ellipse 60% 60% at 50% 0%, rgba(0, 130, 194, 0.14), transparent 70%),
    linear-gradient(180deg, #001a3d 0%, #00122b 100%);
  border-top: 1px solid var(--border-glow);
  border-bottom: 1px solid var(--border-glow);
  overflow: hidden;
}

.security-glow {
  position: absolute;
  width: 600px; height: 600px;
  top: -260px; left: 50%;
  transform: translateX(-50%);
  border-radius: 50%;
  background: rgba(0, 130, 194, 0.12);
  filter: blur(110px);
  pointer-events: none;
}

/* ---------- 規格數字 ---------- */

.spec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 0 0 40px;
}

.spec {
  padding: 26px 22px;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.spec:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.spec dt {
  font-size: 1.9rem;
  font-weight: 900;
  color: var(--accent-bright);
  font-variant-numeric: tabular-nums;
}

.spec dd {
  margin: 6px 0 0;
  font-size: 0.9rem;
  color: var(--text-lo);
}

.format-note {
  max-width: 860px;
  margin: 0 auto;
  padding: 22px 28px;
  border-left: 3px solid var(--accent);
  background: rgba(0, 130, 194, 0.06);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
}

.format-note p { margin: 0; }
.format-note strong { color: var(--text-hi); }

/* ---------- 產品介面 Mockup ---------- */

.mock-window {
  max-width: 1000px;
  margin: 0 auto;
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  background: #01142e;
  box-shadow: 0 30px 80px rgba(0, 15, 35, 0.6);
  overflow: hidden;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(0, 34, 77, 0.6);
  border-bottom: 1px solid var(--border-soft);
}

.mock-dot {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: rgba(140, 190, 225, 0.25);
}

.mock-dot:first-child { background: rgba(224, 82, 82, 0.55); }
.mock-dot:nth-child(2) { background: rgba(230, 190, 90, 0.5); }
.mock-dot:nth-child(3) { background: rgba(90, 200, 140, 0.5); }

.mock-url {
  margin-left: 12px;
  padding: 4px 16px;
  flex: 1;
  max-width: 420px;
  font-size: 0.78rem;
  color: var(--text-lo);
  background: rgba(0, 22, 51, 0.7);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
}

.mock-body {
  display: grid;
  grid-template-columns: 180px 1fr 300px;
  gap: 0;
  min-height: 480px;
}

.mock-side {
  padding: 20px 16px;
  border-right: 1px solid var(--border-soft);
  background: rgba(0, 34, 77, 0.25);
}

.mock-side-title {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-lo);
}

.mock-facet { margin-bottom: 20px; }

.mock-facet p {
  margin: 0 0 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-hi);
}

.mock-opt {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
  padding: 4px 10px;
  font-size: 0.82rem;
  color: var(--text-mid);
  border-radius: 7px;
}

.mock-opt i {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--text-lo);
}

.mock-opt.on {
  color: var(--accent-bright);
  background: rgba(0, 130, 194, 0.14);
  border: 1px solid var(--border-glow);
}

.mock-opt.on i { color: var(--accent-bright); }

.mock-main { padding: 20px 22px; }

.mock-search {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding: 11px 16px;
  font-size: 0.92rem;
  color: var(--text-hi);
  background: rgba(0, 34, 77, 0.5);
  border: 1px solid var(--border-glow);
  border-radius: 999px;
}

.mock-search svg {
  width: 16px; height: 16px;
  color: var(--accent-bright);
  flex: none;
}

.mock-mode {
  margin-left: auto;
  padding: 2px 12px;
  font-size: 0.72rem;
  font-style: normal;
  font-weight: 700;
  color: var(--accent-bright);
  border: 1px solid var(--border-glow);
  border-radius: 999px;
}

.mock-result {
  margin-bottom: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  background: rgba(12, 120, 183, 0.05);
}

.mock-result-title {
  margin: 0 0 6px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-bright);
}

.mock-result-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 8px;
}

.mock-tag {
  padding: 1px 9px;
  font-size: 0.7rem;
  color: var(--accent-bright);
  background: rgba(0, 130, 194, 0.16);
  border: 1px solid var(--border-glow);
  border-radius: 999px;
}

.mock-src {
  font-size: 0.72rem;
  color: var(--text-lo);
}

.mock-result-snippet {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-mid);
  line-height: 1.6;
}

.mock-ai {
  padding: 20px 16px;
  border-left: 1px solid var(--border-soft);
  background: rgba(0, 34, 77, 0.25);
  display: flex;
  flex-direction: column;
}

.mock-ai-title {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-bright);
}

.mock-bubble {
  margin-bottom: 10px;
  padding: 10px 13px;
  font-size: 0.8rem;
  line-height: 1.65;
  border-radius: 12px;
}

.mock-q {
  align-self: flex-end;
  max-width: 90%;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-bottom-right-radius: 4px;
}

.mock-a {
  align-self: flex-start;
  max-width: 100%;
  color: var(--text-mid);
  background: rgba(12, 120, 183, 0.1);
  border: 1px solid var(--border-soft);
  border-bottom-left-radius: 4px;
}

.mock-cite {
  display: inline-block;
  margin: 8px 6px 0 0;
  padding: 1px 9px;
  font-size: 0.68rem;
  color: var(--accent-bright);
  border: 1px solid var(--border-glow);
  border-radius: 999px;
}

.mock-input {
  margin-top: auto;
  padding: 9px 14px;
  font-size: 0.78rem;
  color: var(--text-lo);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  background: rgba(0, 22, 51, 0.6);
}

/* ---------- 生態 ---------- */

.deploy-strip {
  margin-top: 22px;
  padding: 22px 28px;
  font-size: 0.97rem;
}

.deploy-strip p { margin: 0; }
.deploy-strip strong { color: var(--text-hi); }

/* ---------- CTA ---------- */

.section-cta {
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 55% 70% at 50% 110%, rgba(0, 130, 194, 0.22), transparent 70%),
    var(--bg-navy);
}

.cta-glow {
  position: absolute;
  width: 700px; height: 380px;
  bottom: -200px; left: 50%;
  transform: translateX(-50%);
  border-radius: 50%;
  background: rgba(51, 168, 224, 0.16);
  filter: blur(100px);
  pointer-events: none;
}

.cta-inner { position: relative; max-width: 640px; }

.cta-inner p { font-size: 1.05rem; margin-bottom: 32px; }

/* ---------- Footer ---------- */

.footer {
  padding: 64px 0 28px;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-soft);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.footer-brand p {
  margin: 14px 0 0;
  font-size: 0.92rem;
  color: var(--text-lo);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-mid);
  font-size: 0.95rem;
}

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

.footer-copy {
  padding-top: 24px;
  border-top: 1px solid var(--border-soft);
}

.footer-copy p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-lo);
}

/* ---------- 滾動淡入 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .card, .spec, .flow-step, .nav, .card-icon, .card-icon svg { transition: none; }
  .hero-grid-overlay, .hero-glow-a, .hero-glow-b, .hero-particles i { animation: none; }
  .hero-particles { display: none; }
}

/* ---------- RWD ---------- */

@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .spec-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }

  .hero-row { grid-template-columns: 1fr; text-align: center; }
  .hero-actions { justify-content: center; }
  .hero-sub { margin-inline: auto; }
  .hero-visual { max-width: 560px; margin: 0 auto; }

  .mock-body { grid-template-columns: 1fr; }
  .mock-side { border-right: 0; border-bottom: 1px solid var(--border-soft); }
  .mock-facet { display: flex; flex-wrap: wrap; gap: 6px; align-items: baseline; }
  .mock-facet p { width: 100%; }
  .mock-opt { margin-bottom: 0; }
  .mock-ai { border-left: 0; border-top: 1px solid var(--border-soft); }
  .mock-input { margin-top: 10px; }
}

@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .hero { padding: 130px 0 64px; }

  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }

  .nav.open .nav-links {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    background: rgba(0, 22, 51, 0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-soft);
  }

  .nav.open .nav-links a {
    padding: 14px 24px;
  }

  .nav.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .spec-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-direction: column; }
}