:root {
  --navy-950: #071526;
  --navy-900: #0c2038;
  --navy-850: #102946;
  --navy-800: #153454;
  --navy-700: #1e4b75;
  --navy-100: #dbe5ee;
  --gold-600: #a9823d;
  --gold-500: #c8a45a;
  --gold-400: #d4b66f;
  --gold-300: #e2c98f;
  --paper: #f7f2e8;
  --paper-soft: #fcfaf5;
  --paper-deep: #ece3d2;
  --ink: #172230;
  --ink-deep: #0a1625;
  --muted: #657181;
  --muted-light: #a9b6c4;
  --seal: #a33a32;
  --line: rgba(18, 47, 76, 0.14);
  --line-dark: rgba(225, 200, 143, 0.2);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 8px 24px rgba(7, 21, 38, 0.08);
  --shadow-lg: 0 32px 80px rgba(5, 18, 33, 0.24);
  --shell: min(1200px, calc(100vw - 64px));
}

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

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

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper-soft);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body.dialog-open { overflow: hidden; }

button, a { -webkit-tap-highlight-color: transparent; }
button, input, textarea, select { font: inherit; }
a { color: inherit; }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }

::selection { color: var(--navy-950); background: var(--gold-300); }

.paper-grain {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 9px 14px;
  border-radius: 6px;
  color: white;
  background: var(--navy-900);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 3px solid var(--gold-400);
  outline-offset: 4px;
}

.shell { width: var(--shell); margin-inline: auto; }
.section { padding: 132px 0; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 90;
  color: white;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  background: var(--navy-950);
  backdrop-filter: blur(18px) saturate(120%);
}

.nav-shell {
  width: var(--shell);
  height: 76px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 34px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-right: auto;
  color: white;
  text-decoration: none;
}

.brand img { width: 39px; height: 39px; border-radius: 11px; }
.brand-word { display: flex; flex-direction: column; line-height: 1.15; }
.brand-word strong { font-family: var(--serif); font-size: 19px; letter-spacing: 0.12em; }
.brand-word small { margin-top: 5px; color: rgba(255,255,255,0.5); font-size: 8px; letter-spacing: 0.18em; }

.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a {
  position: relative;
  color: rgba(255,255,255,0.74);
  font-size: 13px;
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 180ms ease;
}
.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  background: var(--gold-400);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}
.site-nav a:hover { color: white; }
.site-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.site-nav a.nav-extra { display: none; }

.section-rail {
  position: fixed;
  top: 50%;
  right: 18px;
  z-index: 80;
  transform: translateY(-50%);
  display: grid;
  gap: 1px;
  padding: 10px 12px;
  background: rgba(250, 247, 240, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.section-rail a { display: flex; align-items: center; justify-content: flex-end; gap: 7px; padding: 3px 0; color: var(--muted); font-size: 10px; line-height: 1.5; letter-spacing: 0.03em; text-decoration: none; transition: color 160ms ease; }
.section-rail a i { color: var(--gold-600); font: 8px ui-monospace, monospace; font-style: normal; letter-spacing: 0.04em; opacity: 0.55; transition: opacity 160ms ease; }
.section-rail a b { width: 10px; height: 1px; background: var(--line); transition: width 160ms ease, background 160ms ease; }
.section-rail a:hover { color: var(--navy-900); }
.section-rail a.is-active { color: var(--navy-900); font-weight: 600; }
.section-rail a.is-active i { opacity: 1; }
.section-rail a.is-active b { width: 22px; background: var(--gold-500); }

@media (max-width: 1399px) {
  .section-rail { display: none; }
}

.menu-toggle { display: none; }

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.button-small { min-height: 38px; padding: 0 17px; font-size: 12px; }
.button-gold { color: var(--navy-950); background: var(--gold-500); }
.button-gold:hover { background: var(--gold-300); box-shadow: 0 8px 24px rgba(200,164,90,0.22); }
.button-primary { color: var(--navy-950); background: var(--gold-400); border-color: var(--gold-400); }
.button-primary:hover { background: #ebd59e; border-color: #ebd59e; box-shadow: 0 14px 32px rgba(200,164,90,0.22); }
.button-quiet { color: white; background: transparent; border-color: rgba(255,255,255,0.3); }
.button-quiet:hover, .button-outline-light:hover { border-color: var(--gold-300); color: var(--gold-300); }
.button-outline-light { color: white; background: transparent; border-color: rgba(255,255,255,0.35); }
.hero .button-primary { color: white; background: var(--navy-800); border-color: var(--navy-800); }
.hero .button-primary:hover { background: var(--navy-700); border-color: var(--navy-700); box-shadow: 0 14px 32px rgba(21,52,84,0.2); }
.hero .button-quiet { color: var(--navy-800); border-color: rgba(21,52,84,0.28); }
.hero .button-quiet:hover { color: var(--navy-700); border-color: var(--gold-600); }
.button.is-disabled, .button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
  box-shadow: none;
}

.hero {
  min-height: 900px;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 146px 0 84px;
  color: var(--ink);
  background: var(--paper-soft);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  z-index: -3;
  width: 40%;
  background: var(--navy-800);
}

.hero-grid, .cta-grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-size: 64px 64px;
}

.hero-grid {
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(21,52,84,0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21,52,84,0.09) 1px, transparent 1px);
  mask-image: linear-gradient(to right, black 4%, black 54%, transparent 76%);
}

.cta-grid {
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(226,201,143,0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226,201,143,0.12) 1px, transparent 1px);
  mask-image: linear-gradient(to right, transparent 4%, black 45%, transparent 96%);
}

.hero::before {
  content: "知";
  position: absolute;
  z-index: -1;
  right: -0.02em;
  bottom: -0.3em;
  color: rgba(255,255,255,0.035);
  font-family: var(--serif);
  font-size: clamp(420px, 48vw, 740px);
  font-weight: 700;
  line-height: 1;
}

.hero-orbit { position: absolute; z-index: -1; border: 1px solid rgba(226,201,143,0.13); border-radius: 50%; }
.hero-orbit-one { width: 620px; height: 620px; right: -160px; top: 74px; }
.hero-orbit-two { width: 430px; height: 430px; right: -66px; top: 168px; }

.hero-layout { display: grid; grid-template-columns: minmax(0, 0.86fr) minmax(540px, 1.14fr); gap: 76px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }

.eyebrow, .kicker {
  margin: 0 0 24px;
  color: var(--navy-700);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}
.eyebrow { color: var(--navy-700); }
.eyebrow span {
  margin-right: 12px;
  padding: 5px 9px;
  color: var(--navy-950);
  background: var(--gold-400);
  border-radius: 2px;
}
.kicker-gold { color: var(--gold-300); }

.hero h1 {
  margin: 0;
  color: var(--navy-900);
  font-family: var(--serif);
  font-size: clamp(56px, 5.7vw, 84px);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: 0.02em;
}
.hero h1::after {
  content: "";
  display: block;
  width: 80px;
  height: 3px;
  margin-top: 34px;
  background: linear-gradient(90deg, var(--gold-400) 0 67%, var(--seal) 67% 100%);
}
.hero-lead { margin: 31px 0 12px; color: var(--gold-600); font-family: var(--serif); font-size: 23px; font-weight: 600; }
.hero-body { max-width: 590px; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.release-meta { min-height: 20px; margin: 13px 0 0; color: rgba(255,255,255,0.5); font-size: 12px; letter-spacing: 0.03em; }
.hero .release-meta { color: var(--muted); }
.release-meta-light { color: rgba(255,255,255,0.55); }

.hero-facts {
  display: flex;
  gap: 30px;
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.hero-facts li { display: flex; flex-direction: column; }
.hero-facts b { color: var(--navy-900); font-family: var(--serif); font-size: 22px; font-weight: 600; }
.hero-facts span { color: var(--muted); font-size: 11px; }

.hero-visual { position: relative; isolation: isolate; min-width: 0; padding: 40px 18px 44px 0; }
.folio-label { position: absolute; top: 0; right: 18px; display: flex; align-items: baseline; gap: 8px; color: rgba(255,255,255,0.35); font: 10px ui-monospace, monospace; letter-spacing: 0.12em; }
.folio-label span { color: var(--gold-300); font-family: var(--serif); font-size: 24px; }

.product-window {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(18,47,76,0.13);
  border-radius: 9px;
  background: #fff;
  box-shadow: var(--shadow-lg);
}
.product-window-hero { transform: perspective(1200px) rotateY(-4deg) rotateX(1deg); transform-origin: center left; border-color: rgba(226,201,143,0.23); box-shadow: 0 28px 68px rgba(7,21,38,0.2); }
.product-window-hero > img { height: auto; }
.product-window img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; background: var(--paper-deep); }
.window-bar { height: 38px; display: flex; align-items: center; justify-content: space-between; padding: 0 14px; color: rgba(255,255,255,0.66); background: var(--navy-950); font-size: 10px; }
.window-bar-paper { color: var(--muted); background: #f4efe5; border-bottom: 1px solid var(--line); }
.window-brand { display: inline-flex; align-items: center; gap: 7px; }
.window-brand img { width: 16px; height: 16px; border-radius: 4px; }
.window-brand i { width: 7px; height: 7px; display: inline-block; border-radius: 50%; background: var(--gold-500); }
.window-state { font-family: ui-monospace, monospace; letter-spacing: 0.05em; }

.task-slip {
  position: absolute;
  z-index: 3;
  width: 220px;
  display: grid;
  grid-template-columns: 8px 1fr;
  gap: 2px 10px;
  padding: 13px 15px;
  color: var(--ink);
  background: rgba(252,250,245,0.96);
  border-left: 3px solid var(--gold-500);
  box-shadow: 0 16px 38px rgba(7,21,38,0.17);
}
.task-slip i { grid-row: 1 / 3; width: 7px; height: 7px; margin-top: 4px; border-radius: 50%; background: #2c8b62; box-shadow: 0 0 0 4px rgba(44,139,98,0.12); }
.task-slip span { color: var(--muted); font-size: 10px; }
.task-slip b { font-family: var(--serif); font-size: 13px; }
.task-slip-top { top: 82px; left: -32px; }
.task-slip-bottom { right: -8px; bottom: 4px; }

.hero-foot { position: absolute; right: 0; bottom: 26px; left: 0; display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 9px; letter-spacing: 0.16em; }
.hero-foot i { width: 60px; height: 1px; background: var(--line); }
.hero-foot b { margin-left: auto; color: rgba(255,255,255,0.5); font-family: ui-monospace, monospace; font-weight: 400; }

.section-heading { display: grid; grid-template-columns: 190px minmax(0, 720px); gap: 42px; align-items: start; margin-bottom: 64px; }
.section-heading > div:last-child > p:last-child { max-width: 660px; margin: 22px 0 0; color: var(--muted); }
.section-heading h2, .feature-copy h2, .privacy-copy h2, .faq-intro h2, .final-cta h2 {
  margin: 0;
  color: var(--navy-900);
  font-family: var(--serif);
  font-size: clamp(38px, 4vw, 58px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
}
.section-index { display: flex; align-items: center; gap: 10px; padding-top: 8px; color: var(--muted); font-size: 11px; letter-spacing: 0.15em; }
.section-index span { color: var(--gold-600); font: 21px var(--serif); }
.section-index i { width: 36px; height: 1px; background: var(--line); }
.section-index-light { color: rgba(255,255,255,0.46); }
.section-index-light i { background: rgba(255,255,255,0.18); }
.section-index-light span { color: var(--gold-300); }

.overview { background: var(--paper-soft); }
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.mode-card { min-height: 410px; position: relative; display: flex; flex-direction: column; padding: 34px 32px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--ink); background: rgba(255,255,255,0.36); text-decoration: none; transition: background 220ms ease, transform 220ms ease, box-shadow 220ms ease; }
.mode-card::after { content: ""; position: absolute; right: 0; bottom: 0; left: 0; height: 3px; background: var(--gold-500); transform: scaleX(0); transform-origin: left; transition: transform 240ms ease; }
.mode-card:hover { z-index: 1; background: white; transform: translateY(-8px); box-shadow: var(--shadow-sm); }
.mode-card:hover::after { transform: scaleX(1); }
.mode-number { position: absolute; top: 28px; right: 28px; color: #d8d1c5; font: 30px var(--serif); }
.mode-icon { width: 62px; height: 62px; display: grid; place-items: center; margin-bottom: 46px; color: var(--navy-700); border: 1px solid var(--line); border-radius: 50%; background: var(--paper-soft); }
.mode-icon svg { width: 34px; fill: none; stroke: currentColor; stroke-width: 1.4; }
.mode-type { margin: 0 0 10px; color: var(--gold-600); font: 10px ui-monospace, monospace; letter-spacing: 0.15em; }
.mode-card h3 { margin: 0; color: var(--navy-900); font: 600 30px var(--serif); }
.mode-card > p:not(.mode-type) { margin: 16px 0 28px; color: var(--muted); font-size: 14px; }
.text-link { margin-top: auto; color: var(--navy-700); font-size: 12px; font-weight: 700; }
.text-link i { margin-left: 6px; color: var(--gold-600); font-style: normal; }

.mode-section { padding: 146px 0; }
.mode-section-dark { color: white; background: var(--navy-900); }
.writing-section { background: var(--paper); }
.ppt-section { background: #f0eadf; }
.feature-layout { display: grid; grid-template-columns: minmax(350px, 0.82fr) minmax(0, 1.18fr); gap: 88px; align-items: center; }
.feature-layout-reverse { grid-template-columns: minmax(0, 1.18fr) minmax(350px, 0.82fr); }
.feature-layout-reverse .feature-copy { grid-column: 2; grid-row: 1; }
.feature-layout-reverse .feature-visual { grid-column: 1; grid-row: 1; }
.feature-copy h2 { margin-top: 0; font-size: clamp(36px, 3.4vw, 52px); }
.mode-section-dark .feature-copy h2 { color: white; }
.feature-lead { margin: 26px 0 0; color: var(--muted); font-size: 15px; line-height: 2; }
.mode-section-dark .feature-lead { color: rgba(255,255,255,0.62); }
.feature-copy blockquote { margin: 34px 0 0; padding: 4px 0 4px 22px; color: var(--navy-800); border-left: 2px solid var(--gold-500); font: 600 20px/1.7 var(--serif); }
.mode-section-dark .feature-copy blockquote { color: var(--gold-300); }
.feature-visual { position: relative; min-width: 0; }
.product-window-dark { border-color: rgba(226,201,143,0.2); }
.evidence-card { position: absolute; right: -26px; bottom: -28px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; min-width: 340px; padding: 15px 18px; color: var(--ink); background: white; box-shadow: var(--shadow-lg); }
.evidence-mark { width: 30px; height: 30px; display: grid; place-items: center; color: white; background: #2d8360; border-radius: 50%; }
.evidence-card div { display: flex; flex-direction: column; }
.evidence-card small { color: var(--muted); font-size: 9px; }
.evidence-card b { font-size: 12px; }
.evidence-card > span:last-child { padding: 4px 7px; color: var(--navy-700); background: #eaf0f5; font-size: 9px; }

.task-chain { margin: 42px 0 0; padding: 0; list-style: none; }
.task-chain li { display: grid; grid-template-columns: 34px 1fr; gap: 14px; padding: 13px 0; border-top: 1px solid rgba(255,255,255,0.1); }
.task-chain li:last-child { border-bottom: 1px solid rgba(255,255,255,0.1); }
.task-chain > li > span { color: var(--gold-400); font: 11px ui-monospace, monospace; }
.task-chain div { display: flex; justify-content: space-between; gap: 16px; }
.task-chain b { font-size: 13px; }
.task-chain small { color: rgba(255,255,255,0.4); font-size: 11px; }

.writing-steps { display: grid; grid-template-columns: repeat(5, 1fr); margin: 84px 0 0; padding: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); list-style: none; }
.writing-steps li { position: relative; padding: 25px 22px 27px; border-right: 1px solid var(--line); }
.writing-steps li:last-child { border-right: 0; }
.writing-steps li::before { content: ""; position: absolute; top: -3px; left: 0; width: 34%; height: 3px; background: var(--gold-500); }
.writing-steps span { display: block; color: var(--gold-600); font: 10px ui-monospace, monospace; }
.writing-steps b { display: block; margin-top: 9px; color: var(--navy-900); font: 600 22px var(--serif); }
.writing-steps small { color: var(--muted); font-size: 11px; }

.ppt-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: 8px; margin-top: 38px; }
.ppt-flow span { min-height: 72px; display: flex; flex-direction: column; justify-content: center; padding: 12px; border: 1px solid var(--line); background: rgba(255,255,255,0.38); color: var(--navy-800); font-size: 11px; }
.ppt-flow i { color: var(--gold-600); font: 9px ui-monospace, monospace; }
.ppt-flow > b { color: var(--gold-600); font-weight: 400; }
.template-tabs { display: flex; gap: 8px; margin: 0 0 12px; }
.template-tabs span { padding: 6px 12px; border: 1px solid var(--line); color: var(--muted); background: rgba(255,255,255,0.35); font-size: 10px; }
.template-tabs .active { color: var(--navy-900); border-color: var(--gold-500); background: rgba(255,255,255,0.74); }
.palette-slip { position: absolute; right: -22px; bottom: -28px; display: flex; align-items: center; gap: 7px; padding: 13px 15px; background: white; box-shadow: var(--shadow-sm); }
.palette-slip small { margin-right: 6px; color: var(--muted); font-size: 9px; }
.palette-slip span { width: 22px; height: 22px; background: var(--swatch); border: 1px solid rgba(0,0,0,0.08); }

.difference-section { position: relative; overflow: hidden; padding: 140px 0; color: white; background: var(--navy-950); }
.difference-section::before { content: "WORK CONTEXT"; position: absolute; right: -30px; top: 24px; color: rgba(255,255,255,0.018); font: 700 130px/1 var(--sans); letter-spacing: -0.04em; white-space: nowrap; }
.difference-line { position: absolute; top: 0; bottom: 0; left: calc((100vw - min(1200px, calc(100vw - 64px))) / 2 + 190px); width: 1px; background: rgba(255,255,255,0.06); }
.section-heading-light h2 { color: white; }
.section-heading-light > div:last-child > p:last-child { color: rgba(255,255,255,0.58); }
.difference-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.difference-card { min-height: 430px; position: relative; overflow: hidden; padding: 42px 34px; border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.difference-card::after { content: ""; position: absolute; right: 0; bottom: 0; width: 55px; height: 55px; border-right: 1px solid var(--gold-500); border-bottom: 1px solid var(--gold-500); opacity: 0; transform: translate(10px, 10px); transition: opacity 220ms ease, transform 220ms ease; }
.difference-card:hover::after { opacity: 1; transform: translate(0,0); }
.big-character { position: absolute; right: 12px; top: -28px; color: rgba(255,255,255,0.035); font: 190px var(--serif); }
.difference-card > p:first-of-type { margin: 0 0 36px; color: var(--gold-400); font: 9px ui-monospace, monospace; letter-spacing: 0.14em; }
.difference-card h3 { margin: 0; color: white; font: 600 31px var(--serif); }
.difference-card > p:nth-of-type(2) { min-height: 82px; margin: 20px 0 30px; color: rgba(255,255,255,0.57); font-size: 13px; }
.difference-card ul { margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,0.08); list-style: none; }
.difference-card li { padding: 8px 0; color: rgba(255,255,255,0.7); border-bottom: 1px solid rgba(255,255,255,0.08); font-size: 11px; }
.difference-card li::before { content: "·"; margin-right: 8px; color: var(--gold-400); }

.compare-section { background: var(--paper-soft); }
.compare-wrap { overflow-x: auto; border: 1px solid var(--line); background: white; box-shadow: var(--shadow-sm); }
.compare-wrap:focus-visible { outline-offset: 6px; }
table { width: 100%; min-width: 920px; border-collapse: collapse; table-layout: fixed; }
th, td { padding: 21px 20px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 12px; line-height: 1.65; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
th:last-child, td:last-child { border-right: 0; }
thead th { color: var(--navy-900); background: #f2ede3; font-family: var(--serif); font-size: 14px; }
thead th small { display: block; margin-top: 5px; color: var(--muted); font-family: var(--sans); font-size: 10px; font-weight: 400; letter-spacing: 0.02em; }
thead th:first-child { width: 15%; color: var(--muted); font-family: var(--sans); font-size: 11px; }
tbody th { color: var(--navy-700); background: #faf7f0; font-size: 11px; }
tbody td { color: var(--muted); }
.zhiwen-col { color: var(--navy-900); background: rgba(200,164,90,0.1); }
thead .zhiwen-col { position: relative; color: white; background: var(--navy-800); }
thead .zhiwen-col::after { content: "推荐理解"; position: absolute; top: 5px; right: 8px; color: var(--gold-300); font: 8px ui-monospace, monospace; letter-spacing: 0.05em; }
.compare-note { margin: 14px 0 0; color: var(--muted); font-size: 10px; }

.privacy-section { padding: 140px 0; color: white; background: linear-gradient(125deg, var(--navy-800), var(--navy-900)); }
.privacy-layout { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 96px; align-items: start; }
.privacy-copy h2 { color: white; }
.privacy-statement { margin: 28px 0 0; color: rgba(255,255,255,0.66); font-size: 14px; line-height: 2; }
.privacy-warning { margin: 28px 0 0; padding: 13px 15px; color: var(--gold-300); border: 1px solid rgba(226,201,143,0.26); background: rgba(7,21,38,0.18); font-size: 11px; }
.privacy-ledger { border: 1px solid rgba(255,255,255,0.14); background: rgba(7,21,38,0.22); }
.ledger-head { height: 58px; display: flex; align-items: center; justify-content: space-between; padding: 0 22px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.ledger-head span { color: var(--gold-300); font: 9px ui-monospace, monospace; letter-spacing: 0.15em; }
.ledger-head b { font-family: var(--serif); font-size: 14px; }
.privacy-ledger ul { margin: 0; padding: 0 22px; list-style: none; }
.privacy-ledger li { display: grid; grid-template-columns: 34px 1fr auto; gap: 14px; align-items: center; padding: 22px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
.privacy-ledger li:last-child { border-bottom: 0; }
.privacy-ledger li > span { color: var(--gold-400); font: 10px ui-monospace, monospace; }
.privacy-ledger li div { display: flex; flex-direction: column; }
.privacy-ledger li b { font-size: 13px; }
.privacy-ledger li small { margin-top: 3px; color: rgba(255,255,255,0.42); font-size: 10px; }
.privacy-ledger li > i { padding: 3px 7px; color: var(--gold-300); border: 1px solid rgba(226,201,143,0.24); font-size: 9px; font-style: normal; }

.plans-section { background: var(--paper-soft); }
.plan-groups { display: grid; gap: 26px; }
.plan-group { padding: 42px; border: 1px solid var(--line); background: white; box-shadow: var(--shadow-sm); }
.plan-group-lifetime { color: white; border-color: rgba(226,201,143,0.24); background: var(--navy-900); }
.plan-group-head { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; align-items: end; margin-bottom: 30px; }
.plan-group-head h3 { margin: 5px 0 0; color: var(--navy-900); font: 600 31px var(--serif); }
.plan-group-head > p { margin: 0; color: var(--muted); font-size: 13px; }
.plan-group-lifetime .plan-group-head h3 { color: white; }
.plan-group-lifetime .plan-group-head > p { color: rgba(255,255,255,0.62); }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.plan-card { min-height: 142px; padding: 24px; border: 1px solid var(--line); background: var(--paper-soft); }
.plan-card > span { color: var(--gold-600); font: 9px ui-monospace, monospace; letter-spacing: 0.14em; }
.plan-card h4 { margin: 19px 0 2px; color: var(--navy-900); font: 600 24px var(--serif); }
.plan-card p { margin: 0; color: var(--muted); font-size: 12px; }
.lifetime-details { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid rgba(255,255,255,0.14); }
.lifetime-details div { min-height: 110px; display: flex; flex-direction: column; justify-content: center; padding: 20px 24px; border-right: 1px solid rgba(255,255,255,0.14); }
.lifetime-details div:last-child { border-right: 0; }
.lifetime-details b { color: var(--gold-300); font: 600 18px var(--serif); }
.lifetime-details span { margin-top: 6px; color: rgba(255,255,255,0.54); font-size: 11px; }
.lifetime-boundary { margin: 22px 0 0; padding: 13px 15px; color: rgba(255,255,255,0.7); border-left: 3px solid var(--gold-500); background: rgba(7,21,38,0.24); font-size: 11px; }
.plan-actions { display: flex; align-items: center; gap: 20px; margin-top: 28px; }
.plan-actions small { color: var(--muted); font-size: 10px; }
.plan-group-lifetime .plan-actions small { color: rgba(255,255,255,0.48); }
.purchase-steps { display: grid; grid-template-columns: repeat(4, 1fr); margin: 26px 0 0; padding: 0; border: 1px solid var(--line); background: var(--paper); list-style: none; }
.purchase-steps li { min-height: 112px; display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: center; padding: 20px; border-right: 1px solid var(--line); }
.purchase-steps li:last-child { border-right: 0; }
.purchase-steps li > span { color: var(--gold-600); font: 10px ui-monospace, monospace; }
.purchase-steps li div { display: flex; flex-direction: column; }
.purchase-steps b { color: var(--navy-900); font: 600 15px var(--serif); }
.purchase-steps small { margin-top: 4px; color: var(--muted); font-size: 10px; line-height: 1.6; }

.start-section { background: var(--paper); }
.start-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; list-style: none; }
.start-grid li { padding: 0 42px 0 0; }
.start-grid li > span { color: var(--gold-600); font: 34px var(--serif); }
.start-line { position: relative; height: 1px; margin: 19px 0 28px; background: var(--line); }
.start-line::before { content: ""; position: absolute; top: -3px; left: 0; width: 7px; height: 7px; border-radius: 50%; background: var(--gold-500); }
.start-grid h3 { margin: 0; color: var(--navy-900); font: 600 23px var(--serif); }
.start-grid p { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.faq-section { background: var(--paper-soft); border-top: 1px solid var(--line); }
.faq-layout { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 90px; align-items: start; }
.faq-intro { position: sticky; top: 120px; }
.faq-intro h2 { margin-top: 0; }
.faq-intro > p:last-child { margin-top: 24px; color: var(--muted); font-size: 13px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { min-height: 72px; display: grid; grid-template-columns: 34px 1fr 20px; gap: 14px; align-items: center; cursor: pointer; color: var(--navy-900); font-family: var(--serif); font-size: 16px; font-weight: 600; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--gold-600); font: 10px ui-monospace, monospace; }
.faq-list summary i { position: relative; width: 16px; height: 16px; }
.faq-list summary i::before, .faq-list summary i::after { content: ""; position: absolute; top: 7px; left: 2px; width: 12px; height: 1px; background: var(--navy-700); transition: transform 180ms ease; }
.faq-list summary i::after { transform: rotate(90deg); }
.faq-list details[open] summary i::after { transform: rotate(0deg); }
.faq-list details p { margin: -4px 50px 24px 48px; color: var(--muted); font-size: 13px; }

.final-cta { position: relative; isolation: isolate; overflow: hidden; padding: 120px 0; color: white; background: var(--navy-950); text-align: center; }
.final-cta::after { content: ""; position: absolute; z-index: -1; width: 520px; height: 520px; left: 50%; top: 50%; border: 1px solid rgba(226,201,143,0.12); border-radius: 50%; transform: translate(-50%,-50%); box-shadow: 0 0 0 90px rgba(226,201,143,0.025), 0 0 0 180px rgba(226,201,143,0.018); }
.final-cta-inner { display: flex; flex-direction: column; align-items: center; }
.final-cta-inner > img { margin-bottom: 22px; border-radius: 17px; box-shadow: 0 12px 34px rgba(0,0,0,0.25); }
.final-cta h2 { max-width: 820px; color: white; font-size: clamp(36px, 4.5vw, 60px); }
.final-cta-inner > p:not(.kicker):not(.release-meta) { max-width: 620px; margin: 22px 0 0; color: rgba(255,255,255,0.55); }
.hero-actions-center { justify-content: center; }

.site-footer { color: rgba(255,255,255,0.6); background: #05111f; border-top: 1px solid rgba(255,255,255,0.08); }
.footer-inner { min-height: 112px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { border-radius: 9px; }
.footer-brand div { display: flex; flex-direction: column; line-height: 1.3; }
.footer-brand b { color: white; font: 600 15px var(--serif); }
.footer-brand small { margin-top: 4px; font-size: 9px; }
.site-footer nav { display: flex; gap: 24px; }
.site-footer a { font-size: 11px; text-decoration: none; }
.site-footer a:hover { color: var(--gold-300); }
.site-footer p { margin: 0; text-align: right; font-size: 10px; }

.dialog-backdrop { position: fixed; inset: 0; z-index: 150; display: grid; place-items: center; padding: 20px; background: rgba(5,17,31,0.72); backdrop-filter: blur(8px); }
.dialog-backdrop[hidden] { display: none; }
.consult-dialog { width: min(430px, 100%); position: relative; padding: 38px; color: var(--ink); background: var(--paper-soft); border-top: 4px solid var(--gold-500); box-shadow: var(--shadow-lg); text-align: center; }
.consult-dialog h2 { margin: 0; color: var(--navy-900); font: 600 30px var(--serif); }
.consult-dialog > p:not(.kicker):not(.wechat-account) { color: var(--muted); font-size: 13px; }
.consult-dialog img { margin: 22px auto 16px; padding: 8px; background: white; border: 1px solid var(--line); }
.wechat-account { margin: 0; color: var(--muted); font-size: 12px; }
.wechat-account b { color: var(--navy-800); }
.dialog-close { position: absolute; top: 10px; right: 12px; width: 34px; height: 34px; border: 0; color: var(--muted); background: transparent; cursor: pointer; font-size: 28px; line-height: 1; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity 650ms cubic-bezier(.2,.7,.2,1) var(--delay, 0ms), transform 650ms cubic-bezier(.2,.7,.2,1) var(--delay, 0ms); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1060px) {
  :root { --shell: min(100% - 44px, 960px); }
  .site-nav { gap: 18px; }
  .hero { min-height: auto; }
  .hero::after { top: 48%; width: 46%; }
  .hero-layout { grid-template-columns: 1fr; gap: 62px; }
  .hero-copy { max-width: 720px; }
  .hero-visual { width: min(840px, 100%); margin-inline: auto; }
  .section-heading { grid-template-columns: 145px 1fr; }
  .feature-layout, .feature-layout-reverse { grid-template-columns: 1fr; gap: 64px; }
  .feature-layout-reverse .feature-copy, .feature-layout-reverse .feature-visual { grid-column: 1; }
  .feature-layout-reverse .feature-copy { grid-row: 1; }
  .feature-layout-reverse .feature-visual { grid-row: 2; }
  .feature-copy { max-width: 760px; }
  .evidence-card { right: 0; }
  .privacy-layout { gap: 54px; }
  .faq-layout { gap: 50px; }
}

@media (max-width: 840px) {
  .nav-shell > .button { display: none; }
  .menu-toggle {
    order: 3;
    width: 82px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 0;
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 2px;
    background: transparent;
    cursor: pointer;
  }
  .menu-label { font-size: 11px; }
  .menu-lines { width: 16px; display: flex; flex-direction: column; gap: 4px; }
  .menu-lines i { height: 1px; background: currentColor; transition: transform 180ms ease; }
  .menu-toggle[aria-expanded="true"] .menu-lines i:first-child { transform: translateY(2.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-lines i:last-child { transform: translateY(-2.5px) rotate(-45deg); }
  .site-nav {
    position: absolute;
    top: 76px;
    right: 0;
    left: 0;
    display: grid;
    gap: 0;
    padding: 8px max(22px, calc((100vw - var(--shell)) / 2));
    background: rgba(7,21,38,0.98);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    transform: translateY(-130%);
    visibility: hidden;
    opacity: 0;
    transition: transform 200ms ease, opacity 200ms ease, visibility 200ms;
  }
  .site-nav.is-open { transform: translateY(0); visibility: visible; opacity: 1; }
  .site-nav a { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .site-nav a:last-child { border-bottom: 0; }
  .site-nav a.nav-extra { display: block; }
  .mode-grid { grid-template-columns: 1fr; }
  .mode-card { min-height: 330px; }
  .difference-grid { grid-template-columns: 1fr; }
  .difference-card { min-height: 340px; }
  .privacy-layout, .faq-layout { grid-template-columns: 1fr; }
  .faq-intro { position: static; }
  .plan-group-head { grid-template-columns: 1fr; gap: 14px; }
  .purchase-steps { grid-template-columns: repeat(2, 1fr); }
  .purchase-steps li:nth-child(2) { border-right: 0; }
  .purchase-steps li:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .start-grid { gap: 30px; }
}

@media (max-width: 720px) {
  :root { --shell: calc(100vw - 32px); }
  html { scroll-padding-top: 72px; }
  body { font-size: 15px; }
  .section, .mode-section { padding: 88px 0; }
  .nav-shell { height: 66px; }
  .brand img { width: 34px; height: 34px; }
  .brand-word strong { font-size: 17px; }
  .brand-word small { display: none; }
  .site-nav { top: 66px; }
  .hero { padding: 120px 0 74px; }
  .hero::after { display: none; }
  .hero-orbit { display: none; }
  .hero-grid { opacity: 0.2; mask-image: linear-gradient(to bottom, black, transparent 72%); }
  .hero h1 { font-size: clamp(48px, 14.5vw, 64px); }
  .hero-lead { font-size: 19px; }
  .hero-body { font-size: 14px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-facts { gap: 18px; justify-content: space-between; }
  .hero-facts b { font-size: 19px; }
  .hero-facts span { max-width: 70px; }
  .hero-visual { padding: 42px 0 60px; }
  .hero-visual::before {
    content: "";
    position: absolute;
    inset: 54px -16px 18px;
    z-index: -1;
    background: var(--navy-800);
  }
  .product-window-hero { transform: none; }
  .task-slip { width: 190px; padding: 10px 12px; }
  .task-slip-top { top: 4px; left: -4px; }
  .task-slip-bottom { right: -4px; bottom: 10px; }
  .folio-label { display: none; }
  .hero-foot { display: none; }
  .section-heading { grid-template-columns: 1fr; gap: 24px; margin-bottom: 42px; }
  .section-heading h2, .feature-copy h2, .privacy-copy h2, .faq-intro h2, .final-cta h2 { font-size: 36px; }
  .section-index { padding-top: 0; }
  .mode-card { min-height: 300px; padding: 28px 25px; }
  .mode-icon { margin-bottom: 28px; }
  .feature-layout { gap: 46px; }
  .feature-lead { font-size: 14px; }
  .feature-copy blockquote { font-size: 18px; }
  .evidence-card { right: 8px; bottom: -30px; min-width: 270px; }
  .task-chain div { flex-direction: column; gap: 0; }
  .writing-steps { grid-template-columns: 1fr; margin-top: 64px; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
  .writing-steps li { display: grid; grid-template-columns: 36px 1fr 1fr; align-items: center; padding: 15px 18px; border-right: 0; border-bottom: 1px solid var(--line); }
  .writing-steps li:last-child { border-bottom: 0; }
  .writing-steps li::before { top: 0; bottom: 0; width: 3px; height: auto; }
  .writing-steps b { margin: 0; font-size: 18px; }
  .ppt-flow { grid-template-columns: 1fr; }
  .ppt-flow > b { transform: rotate(90deg); text-align: center; }
  .palette-slip { right: 8px; bottom: -30px; }
  .difference-section, .privacy-section { padding: 94px 0; }
  .difference-line { display: none; }
  .difference-card { min-height: 330px; padding: 32px 26px; }
  .privacy-layout { gap: 48px; }
  .privacy-ledger li { grid-template-columns: 28px 1fr; }
  .privacy-ledger li > i { grid-column: 2; justify-self: start; }
  .plan-group { padding: 28px 22px; }
  .plan-grid { grid-template-columns: 1fr; }
  .lifetime-details { grid-template-columns: 1fr; }
  .lifetime-details div { border-right: 0; border-bottom: 1px solid rgba(255,255,255,0.14); }
  .lifetime-details div:last-child { border-bottom: 0; }
  .plan-actions { align-items: stretch; flex-direction: column; }
  .plan-actions .button { width: 100%; }
  .purchase-steps { grid-template-columns: 1fr; }
  .purchase-steps li, .purchase-steps li:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .purchase-steps li:last-child { border-bottom: 0; }
  .start-grid { grid-template-columns: 1fr; gap: 52px; }
  .start-grid li { padding-right: 0; }
  .faq-list summary { min-height: 68px; font-size: 14px; }
  .faq-list details p { margin: 0 34px 22px 48px; }
  .final-cta { padding: 94px 0; }
  .footer-inner { grid-template-columns: 1fr; justify-items: start; padding: 32px 0; }
  .site-footer nav { flex-wrap: wrap; }
  .site-footer p { text-align: left; }
  .consult-dialog { padding: 34px 22px 26px; }
}

@media (max-width: 430px) {
  .menu-toggle { width: 70px; }
  .hero h1 { font-size: 46px; }
  .hero-facts { gap: 10px; }
  .hero-facts span { font-size: 9px; }
  .task-slip { transform: scale(0.86); }
  .task-slip-top { transform-origin: top left; }
  .task-slip-bottom { transform-origin: bottom right; }
  .palette-slip { transform: scale(0.9); transform-origin: bottom right; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}