/* ==============================================================================
 * Lives — Minimal Zine Poster & Dark Editorial System (Inspired by PaperRss)
 * Dark Tone & Warm Ink Aesthetic (深炭黑暗调、珍珠白、琥珀金高光、极简海报排版)
 * ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Noto+Serif+SC:wght@500;600;700&display=swap');

:root {
  /* Dark Tone & Warm Ink Palette */
  --bg-body: #0e0d0b;
  --bg-canvas: #12110e;
  --surface: #171612;
  --surface-raised: #1e1c17;
  --surface-hover: #26241e;
  --card: #181713;
  --card-hover: #211f1a;
  --chip: #201e19;
  --chip-hover: #2a2721;
  --panel: #161511;

  /* Ink / Text */
  --ink: #f5f2eb;
  --ink-primary: #f5f2eb;
  --ink-muted: #a39e93;
  --ink-subtle: #736e63;
  --muted: #a39e93;
  --subtle: #736e63;
  --label: rgba(245, 242, 235, 0.42);

  /* Accents */
  --amber: #f4b942;
  --amber-soft: #ffd77f;
  --amber-glow: rgba(244, 185, 66, 0.16);
  --amber-border: rgba(244, 185, 66, 0.35);
  --green: #79bf91;
  --green-soft: rgba(121, 191, 145, 0.15);

  /* Borders & Hairlines */
  --hairline: rgba(245, 242, 235, 0.08);
  --border: rgba(245, 242, 235, 0.09);
  --border-medium: rgba(245, 242, 235, 0.16);
  --ring: rgba(244, 185, 66, 0.28);
  --kbd-bg: rgba(255, 255, 255, 0.07);

  /* Shadows */
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 28px 72px -16px rgba(0, 0, 0, 0.75), 0 4px 16px rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'STSong', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;

  /* Layout */
  --max-width: 1080px;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-body);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  background: var(--bg-body);
  color: var(--ink);
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* 纸张深色微噪点纹理 */
body::before {
  content: "";
  position: fixed;
  z-index: 999;
  inset: 0;
  pointer-events: none;
  opacity: 0.026;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
}

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

button, a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

:focus-visible {
  outline: 2px solid var(--amber-soft);
  outline-offset: 3px;
}

::selection {
  color: #11100e;
  background: var(--amber-soft);
}

.inline-link {
  color: var(--amber-soft);
  text-decoration: underline;
  text-decoration-color: rgba(255, 215, 127, 0.35);
  text-underline-offset: 0.25em;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}

.inline-link:hover {
  text-decoration-color: var(--amber);
  color: var(--amber);
}

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 20px;
  top: 16px;
  padding: 8px 16px;
  transform: translateY(-160%);
  border-radius: 8px;
  color: #11100e;
  background: var(--amber);
  font-size: 13px;
  font-weight: 600;
  transition: transform 0.18s ease;
}

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

/* Layout Container */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ==============================================================================
 * Header / Navbar (Hidden by default for pure Minimal Zine Poster experience, like PaperRss)
 * ============================================================================== */
.site-header {
  display: none !important;
}

/* ==============================================================================
 * Section Dividers (Minimal Zine Hairline + Monospace uppercase labels)
 * ============================================================================== */
.section-divider {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin: 5rem auto 3rem;
  max-width: 960px;
}

.section-divider .hairline {
  height: 1px;
  flex: 1;
  background-color: var(--hairline);
}

.section-divider .section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--label);
  white-space: nowrap;
}

/* ==============================================================================
 * Hero Section (Minimal Zine Poster Aesthetic — 纯粹海报质感)
 * ============================================================================== */
.hero {
  padding: 5.5rem 0 3.5rem 0;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 820px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-app-icon {
  width: 84px;
  height: 84px;
  margin: 0 0 1.25rem;
  user-select: none;
  -webkit-user-drag: none;
}

.hero-app-icon img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 22px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--border);
}

/* Slogan Title — 3 秒从模糊到清晰的 Live Photo 动态聚焦定格 */
.scramble-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5.4vw, 3.8rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.035em;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
  margin-bottom: 1.15rem;
  max-width: 800px;
  transition: transform 0.2s ease;
}

.scramble-title:active {
  transform: scale(0.99);
}

.scramble-target {
  display: inline-block;
  line-height: inherit;
  white-space: normal;
  will-change: filter, opacity, letter-spacing;
  transition: filter 0.15s ease-out, opacity 0.15s ease-out;
}

.hero-subtitle {
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  color: var(--ink-muted);
  max-width: 620px;
  line-height: 1.7;
  margin-bottom: 2.25rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* ==============================================================================
 * Hero Button Cluster (PaperRss 极简 44px 药丸胶囊体系)
 * ============================================================================== */
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  margin-bottom: 1.5rem;
}

/* Split / Main Download CTA */
.dl-split {
  display: inline-flex;
  align-items: stretch;
}

.dl-main {
  display: inline-flex;
  height: 44px;
  align-items: center;
  gap: 0.55rem;
  border-radius: 999px;
  background: var(--amber);
  color: #11100e;
  padding: 0 1.35rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(244, 185, 66, 0.2);
  transition: background 0.15s ease, transform 0.12s ease, box-shadow 0.15s ease;
}

.dl-main:hover {
  background: var(--amber-soft);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(244, 185, 66, 0.32);
}

.dl-main-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
}

.dl-main-icon svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.dl-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(17, 16, 14, 0.16);
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  margin-left: 0.35rem;
}

/* GitHub Star Pill Button */
.btn-github {
  display: inline-flex;
  height: 44px;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--chip);
  border: 1px solid var(--border);
  padding: 0 1.15rem;
  border-radius: 999px;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
  white-space: nowrap;
}

.btn-github:hover {
  background: var(--chip-hover);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.gh-star-badge {
  display: none;
  align-items: center;
  gap: 0.25rem;
  background: var(--kbd-bg);
  border: 1px solid var(--hairline);
  padding: 0.12rem 0.48rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--amber-soft);
  line-height: 1.2;
}

.gh-star-badge.is-visible {
  display: inline-flex;
}

.gh-star-icon {
  width: 11px;
  height: 11px;
  fill: var(--amber-soft);
}

/* Secondary CTA Chip (特性 / 快速上手) */
.hero-cta-secondary {
  display: inline-flex;
  height: 44px;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink);
  background: var(--chip);
  border: 1px solid var(--border);
  text-decoration: none;
  padding: 0 1.15rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.82rem;
  letter-spacing: -0.01em;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.hero-cta-secondary:hover {
  background: var(--chip-hover);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.hero-cta-secondary svg {
  width: 14px;
  height: 14px;
  transition: transform 0.15s ease;
}

.hero-cta-secondary:hover svg {
  transform: translate(2px, -2px);
}

.hero-note {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-subtle);
  letter-spacing: 0.02em;
}

/* ==============================================================================
 * Showcase Stage (Mac Window with Amber Glow)
 * ============================================================================== */
.product-stage {
  position: relative;
  width: 100%;
  margin: 2rem 0 3.5rem;
}

.window-glow {
  position: absolute;
  inset: 10% 12% 0;
  background: radial-gradient(circle, rgba(244, 185, 66, 0.12) 0%, rgba(14, 13, 11, 0) 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.real-window {
  position: relative;
  z-index: 1;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-lg);
  background: var(--surface);
}

.real-window img {
  width: 100%;
  height: auto;
  display: block;
}

.stage-caption {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-subtle);
  letter-spacing: 0.04em;
}

.stage-caption-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(244, 185, 66, 0.15);
}

/* ==============================================================================
 * Trust Rail / Core Philosophy Bento (4-Column Grid)
 * ============================================================================== */
.trust-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 0 0 3.5rem;
}

.trust-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.trust-item:hover {
  background: var(--card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.trust-item strong {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.trust-item span {
  font-size: 0.8rem;
  color: var(--ink-muted);
  line-height: 1.48;
}

.trust-item.link-item {
  text-decoration: none;
}

.trust-item.link-item strong {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==============================================================================
 * Section Headings
 * ============================================================================== */
.section-title-group {
  margin-bottom: 2.5rem;
}

.section-title-group.centered {
  text-align: center;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-soft);
  margin-bottom: 0.6rem;
}

.section-title-group h2,
.demo-copy h2,
.privacy-copy h2,
.final-cta h2,
.sponsor-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.22;
  color: var(--ink);
}

.section-title-group p.section-lede {
  margin-top: 0.75rem;
  font-size: 0.96rem;
  color: var(--ink-muted);
  max-width: 620px;
  line-height: 1.68;
}

.section-title-group.centered p.section-lede {
  margin-inline: auto;
}

/* ==============================================================================
 * Demo Section (Interactive Video Player — 左右排版严格保持)
 * ============================================================================== */
.demo-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(360px, 1.2fr);
  align-items: center;
  gap: clamp(2rem, 4vw, 4.5rem);
  margin-bottom: 3.5rem;
}

.demo-copy h2 {
  margin-bottom: 1.1rem;
}

.demo-copy > p:not(.section-eyebrow) {
  font-size: 0.95rem;
  color: var(--ink-muted);
  line-height: 1.72;
}

.demo-copy ul {
  list-style: none;
  display: grid;
  gap: 0.85rem;
  margin: 1.75rem 0 1.5rem;
}

.demo-copy li {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--ink);
}

.demo-copy li b {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--amber-soft);
  padding: 0.15rem 0.35rem;
  background: var(--chip);
  border: 1px solid var(--border);
  border-radius: 4px;
  text-align: center;
}

.demo-copy small {
  display: block;
  font-size: 0.75rem;
  color: var(--ink-subtle);
  line-height: 1.6;
}

.demo-player {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-medium);
  background: #000000;
  box-shadow: var(--shadow-lg);
}

.demo-player video {
  width: 100%;
  height: auto;
  display: block;
}

.demo-toggle {
  position: absolute;
  right: 14px;
  bottom: 46px;
  z-index: 10;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(14, 13, 11, 0.75);
  backdrop-filter: blur(8px);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: background 0.15s ease, transform 0.12s ease;
}

.demo-toggle:hover {
  background: rgba(14, 13, 11, 0.95);
  transform: scale(1.06);
}

.demo-player figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
}

.demo-player figcaption span:first-child {
  font-weight: 600;
  color: var(--ink);
}

/* ==============================================================================
 * Workflow Section (01 挑 / 02 拼 / 03 动)
 * ============================================================================== */
.workflow-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.workflow-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.workflow-card:hover {
  background: var(--card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.workflow-card-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber-soft);
  margin-bottom: 0.85rem;
}

.workflow-visual {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--surface);
  margin-bottom: 1.15rem;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.workflow-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.workflow-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 650;
  color: var(--ink);
  margin-bottom: 0.45rem;
}

.workflow-card p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.62;
}

/* ==============================================================================
 * Features Grid (Adaptive Bento Grid based on Image Proportions)
 * 左侧 01 / LAYOUTS 竖版长图跨两行完整呈现；右上 02 宽扁长条；右下 03 4:3 画布
 * ============================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  grid-template-rows: auto auto;
  gap: 1.25rem;
  align-items: stretch;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.15rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.feature-card:hover {
  background: var(--card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber-soft);
  margin-bottom: 0.45rem;
}

.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 650;
  color: var(--ink);
  margin-bottom: 0.45rem;
  letter-spacing: -0.02em;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

/* 01 / LAYOUTS: 左侧跨两行完整容纳竖版长图 */
.feature-card.feature-card-layouts {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.visual-layouts {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: #151410;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  max-height: 480px;
}

.visual-layouts img {
  width: 100%;
  max-height: 460px;
  object-fit: contain;
  display: block;
}

/* 02 / KEYFRAME: 右上卡片，完整呈现横向播放轴 */
.feature-card.feature-card-keyframe {
  grid-column: 2;
}

.visual-keyframe {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: #151410;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-keyframe img {
  width: 100%;
  height: auto;
  max-height: 56px;
  object-fit: contain;
  display: block;
}

/* 03 / RATIOS: 右下卡片，完整呈现 4:3 画布视图 */
.feature-card.feature-card-ratios {
  grid-column: 2;
}

.visual-ratios {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: #151410;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
}

.visual-ratios img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ==============================================================================
 * Privacy Section (Local First Bento — 左右排版严格保持)
 * ============================================================================== */
.privacy-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: clamp(1.75rem, 3.5vw, 3rem);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  align-items: center;
  gap: 2.5rem;
}

.privacy-copy h2 {
  margin-bottom: 0.9rem;
}

.privacy-copy > p:not(.section-eyebrow) {
  font-size: 0.95rem;
  color: var(--ink-muted);
  line-height: 1.72;
  margin-bottom: 1.5rem;
}

.privacy-bullets {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.75rem;
}

.privacy-bullets li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.86rem;
  color: var(--ink);
}

.privacy-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(121, 191, 145, 0.15);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--green);
}

.privacy-detail-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--amber-soft);
  border-bottom: 1px solid rgba(255, 215, 127, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.privacy-detail-link:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.privacy-badge-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  text-align: center;
}

.privacy-badge-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--chip);
  border: 1px solid var(--border-medium);
  color: var(--amber-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-sm);
}

.privacy-badge-box strong {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.privacy-badge-box span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-subtle);
  letter-spacing: 0.08em;
}

/* ==============================================================================
 * Install Section
 * ============================================================================== */
.install-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.install-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.install-item:hover {
  background: var(--card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.install-item-step {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--amber-soft);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--chip);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.install-item h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

.install-item p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.62;
}

.release-notice {
  background: var(--chip);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.15rem 1.4rem;
  font-size: 0.84rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

.release-notice strong {
  display: block;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

/* ==============================================================================
 * Support & Feedback Section
 * ============================================================================== */
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.support-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}

.support-card:hover {
  background: var(--card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.support-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-soft);
}

.support-card h3 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0.25rem 0 0.45rem;
}

.support-card p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

.support-card-action {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink);
  transition: color 0.15s ease;
}

.support-card:hover .support-card-action {
  color: var(--amber-soft);
}

/* ==============================================================================
 * FAQ Section (Minimal Accordion)
 * ============================================================================== */
.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-list details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.faq-list details[open] {
  background: var(--surface);
  border-color: var(--border-medium);
}

.faq-list summary {
  padding: 1.15rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--ink-subtle);
  transition: transform 0.15s ease;
}

.faq-list details[open] summary::after {
  content: "−";
  color: var(--amber-soft);
}

.faq-list details p {
  padding: 0 1.4rem 1.25rem;
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.72;
}

/* ==============================================================================
 * Final CTA Section
 * ============================================================================== */
.final-cta {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  margin: 3.5rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-md);
}

.final-cta img {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.final-cta h2 {
  margin-bottom: 1.5rem;
}

/* ==============================================================================
 * Sponsor & Feedback Section (左右排版严格保持)
 * ============================================================================== */
.sponsor-section {
  text-align: center;
  margin-bottom: 4rem;
}

.sponsor-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-soft);
  margin-bottom: 0.6rem;
}

.sponsor-section h2 {
  margin-bottom: 0.85rem;
}

.sponsor-desc {
  max-width: 580px;
  margin: 0 auto 2.2rem;
  font-size: 0.95rem;
  color: var(--ink-muted);
  line-height: 1.72;
}

.sponsor-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  max-width: 680px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
}

.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.qr-card img {
  width: 170px;
  height: 170px;
  border-radius: 12px;
  border: 1px solid var(--border-medium);
  padding: 6px;
  background: #ffffff;
  display: block;
}

.qr-caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-subtle);
  letter-spacing: 0.04em;
}

.feedback-links {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  flex: 1;
  min-width: 240px;
}

.feedback-btn {
  display: inline-flex;
  height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 1.25rem;
  background: var(--amber);
  color: #11100e;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 650;
  transition: background 0.15s ease, transform 0.12s ease;
}

.feedback-btn:hover {
  background: var(--amber-soft);
  transform: translateY(-1px);
}

.feedback-btn.secondary-feedback {
  background: var(--chip);
  color: var(--ink);
  border: 1px solid var(--border);
}

.feedback-btn.secondary-feedback:hover {
  background: var(--chip-hover);
  border-color: var(--border-medium);
}

/* ==============================================================================
 * Site Footer (4-Column Editorial Grid)
 * ============================================================================== */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 4rem 0 2.5rem;
  background: var(--bg-body);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.footer-brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  margin-bottom: 1rem;
  display: block;
}

.footer-brand p {
  font-size: 0.86rem;
  color: var(--ink-muted);
  line-height: 1.65;
  max-width: 280px;
}

.footer-col h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--label);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.footer-col a {
  font-size: 0.84rem;
  color: var(--ink-muted);
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--ink);
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.76rem;
  color: var(--ink-subtle);
}

.footer-bottom a {
  color: var(--ink-muted);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.footer-bottom a:hover {
  color: var(--ink);
}

/* ==============================================================================
 * Reveal Animations & Interaction Utils
 * ============================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================================================================
 * Legal / Auxiliary Page Styles (privacy.html, terms.html, notices.html, etc.)
 * ============================================================================== */
body.legal-page {
  background: var(--bg-body);
  color: var(--ink);
}

.legal-header {
  border-bottom: 1px solid var(--hairline);
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.legal-header a.back-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-muted);
}

.legal-header a.back-link:hover {
  color: var(--ink);
}

body.legal-page main {
  max-width: 760px;
  margin: 3.5rem auto 5rem;
  padding: 0 1.5rem;
}

body.legal-page h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0.75rem 0 1.25rem;
}

.legal-lede {
  font-size: 1rem;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.legal-summary {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}

.legal-summary li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-size: 0.82rem;
  color: var(--ink-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.legal-summary li b {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--amber-soft);
}

body.legal-page section {
  margin-bottom: 2rem;
}

body.legal-page section h2 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.6rem;
}

body.legal-page section p,
body.legal-page section ul {
  font-size: 0.92rem;
  color: var(--ink-muted);
  line-height: 1.75;
}

body.legal-page section ul {
  padding-left: 1.25rem;
}

body.legal-page footer {
  border-top: 1px solid var(--hairline);
  padding: 2rem 1.5rem;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--ink-subtle);
}

body.legal-page footer div {
  display: flex;
  gap: 1.25rem;
}

/* ==============================================================================
 * Responsive Media Queries
 * ============================================================================== */
@media (max-width: 900px) {
  .trust-rail {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-section {
    grid-template-columns: 1fr;
  }

  .workflow-list {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-card.wide {
    grid-template-columns: 1fr;
  }

  .privacy-card {
    grid-template-columns: 1fr;
  }

  .install-list {
    grid-template-columns: 1fr;
  }

  .support-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .legal-summary {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .hero {
    padding: 3.5rem 0 2rem;
  }

  .scramble-title {
    font-size: 2.1rem;
  }

  .hero-subtitle {
    font-size: 0.94rem;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
    max-width: 340px;
    margin-inline: auto;
  }

  .dl-split,
  .btn-github,
  .hero-cta-secondary {
    width: 100%;
    justify-content: center;
  }

  .trust-rail {
    grid-template-columns: 1fr;
  }

  .privacy-bullets {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .sponsor-box {
    padding: 1.5rem;
  }
}