/* ========== 官网落地页样式 ========== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-1);
  color: var(--fg);
  font-family: system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  font-size: 14px;
  font-optical-sizing: auto; /* Apple 排版 §15 */
  text-rendering: optimizeLegibility;
}
.mono { font-family: ui-monospace, monospace; }
a { color: inherit; text-decoration: none; }

/* 按钮系统 —— Apple Response §1：即时按压反馈 + 弹簧缓动 */
.btn {
  font-weight: 600; font-size: 13px;
  padding: 0 20px; min-height: 40px;
  border-radius: var(--r-full);
  border: 1px solid transparent;
  cursor: pointer; transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring), background var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring), color var(--dur-base) var(--ease-spring);
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  -webkit-tap-highlight-color: transparent;
}
.btn:active:not(:disabled) { transform: scale(.97); }
.btn-primary {
  background: var(--grad-main); color: #fff;
  border-color: transparent; box-shadow: var(--shadow-pink);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-pink-hover); }
.btn-primary:active { transform: scale(.97); }
.btn-ghost { background: var(--bg-0); color: var(--fg); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--pink-deep); color: var(--pink-deep); background: var(--pink-soft); }
.btn-ghost:active { transform: scale(.97); }
.btn-lg { padding: 0 28px; min-height: 46px; font-size: 15px; }

/* 顶栏 —— 玻璃材质（§12），更柔和 */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 40px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--line);
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 20px; letter-spacing: -.015em; color: var(--pink-deep);
}
.logo .mark { width: 28px; height: 28px; display: grid; grid-template-columns: repeat(3,1fr); gap: 3px; }
.logo .mark i { border-radius: 50%; }
.logo .mark i:nth-child(1) { background: var(--pink); }
.logo .mark i:nth-child(2) { background: var(--yellow); }
.logo .mark i:nth-child(3) { background: var(--mint); }
.logo .mark i:nth-child(4) { background: var(--sky); }
.logo .mark i:nth-child(5) { background: var(--purple); }
.logo .mark i:nth-child(6) { background: var(--coral); }
.logo .mark i:nth-child(7) { background: var(--pink-deep); }
.logo .mark i:nth-child(8) { background: var(--purple-deep); }
.logo .mark i:nth-child(9) { background: var(--mint); }
.nav { display: flex; gap: 32px; font-size: 14px; color: var(--fg-2); font-weight: 500; }
.nav a { transition: .15s; }
.nav a:hover { color: var(--pink-deep); }

/* HERO */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding: 120px 40px 80px; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,143,171,.12), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(195,162,232,.1), transparent 45%),
    radial-gradient(circle at 50% 100%, rgba(168,230,207,.08), transparent 50%);
}
.float-bead { position: absolute; border-radius: 50%; opacity: .5; animation: float 6s ease-in-out infinite; z-index: 1; }
@keyframes float { 0%,100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-20px) rotate(180deg); } }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr 1fr; gap: 60px; align-items: center; max-width: 1320px; margin: 0 auto; width: 100%; }
.kicker { font-size: 13px; color: var(--pink-deep); letter-spacing: .03em; font-weight: 600; margin-bottom: 24px; display: inline-flex; align-items: center; gap: 10px; background: var(--pink-soft); padding: 8px 18px; border-radius: var(--r-full); }
h1.hero-title { font-weight: 700; font-size: clamp(40px, 5.5vw, 72px); line-height: 1.05; letter-spacing: -.025em; margin-bottom: 28px; color: var(--fg); }
h1.hero-title em { font-style: normal; background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lede { font-size: 17px; color: var(--fg-2); line-height: 1.7; max-width: 540px; margin-bottom: 36px; }
.hero-cta { display: flex; gap: 14px; align-items: center; margin-bottom: 48px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.stat .num { font-weight: 700; font-size: 34px; letter-spacing: -.02em; background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .lbl { font-size: 12px; color: var(--fg-3); font-weight: 600; margin-top: 4px; }

/* 拼豆方格 */
.pixel-art { position: relative; width: 100%; aspect-ratio: 1; max-width: 460px; margin-left: auto; }
.pixel-grid { display: grid; grid-template-columns: repeat(20,1fr); grid-template-rows: repeat(20,1fr); gap: 3px; width: 100%; height: 100%; background: var(--bg-0); padding: 16px; border-radius: var(--r-xl); box-shadow: var(--shadow-lg); border: 1px solid var(--line); }
.pixel-grid i { border-radius: 50%; transition: background .6s ease; }
.pixel-tag { position: absolute; bottom: 24px; right: 24px; background: rgba(255,255,255,.95); border: 1px solid var(--line); border-radius: var(--r-full); padding: 8px 14px; font-family: ui-monospace, monospace; font-size: 11px; color: var(--fg-2); backdrop-filter: blur(8px); box-shadow: var(--shadow-sm); }
.pixel-tag .v { color: var(--pink-deep); font-weight: 600; }
.pixel-caps { position: absolute; top: -14px; left: 24px; background: var(--grad-main); color: #fff; padding: 6px 14px; border-radius: var(--r-full); font-size: 11px; font-weight: 600; box-shadow: var(--shadow-sm); }

/* 区块通用 */
section.block { padding: 100px 40px; position: relative; }
.container { max-width: 1320px; margin: 0 auto; }
.sec-head { margin-bottom: 56px; max-width: 720px; }
.sec-kicker { font-size: 13px; color: var(--pink-deep); letter-spacing: .03em; font-weight: 600; margin-bottom: 14px; display: inline-flex; align-items: center; gap: 8px; background: var(--pink-soft); padding: 6px 14px; border-radius: var(--r-full); }
.sec-title { font-weight: 700; font-size: clamp(30px, 4vw, 46px); line-height: 1.1; letter-spacing: -.02em; margin-bottom: 18px; color: var(--fg); }
.sec-title em { font-style: normal; background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sec-desc { font-size: 16px; color: var(--fg-2); line-height: 1.7; max-width: 560px; }

/* 功能卡片 —— 弹簧缓动 hover（§4） */
.feat-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.feat { background: var(--bg-0); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 32px; position: relative; overflow: hidden; transition: transform var(--dur-base) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring); box-shadow: var(--shadow-sm); }
.feat:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--pink); }
.feat::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--grad-main); opacity: 0; transition: opacity var(--dur-base) var(--ease-spring); }
.feat:hover::before { opacity: 1; }
.feat .idx { position: absolute; top: 24px; right: 24px; font-size: 14px; color: var(--fg-3); font-weight: 600; }
.feat .icon { width: 56px; height: 56px; border-radius: var(--r-md); display: grid; place-items: center; margin-bottom: 24px; color: #fff; font-size: 24px; }
.feat .icon.g1 { background: var(--grad-main); }
.feat .icon.g2 { background: var(--grad-warm); }
.feat .icon.g3 { background: var(--grad-cool); }
.feat h3 { font-weight: 700; font-size: 21px; letter-spacing: -.015em; margin-bottom: 12px; color: var(--fg); }
.feat p { color: var(--fg-2); font-size: 14px; line-height: 1.7; margin-bottom: 20px; }
.feat .feat-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--purple-deep); background: var(--purple-soft); padding: 6px 12px; border-radius: var(--r-full); font-weight: 600; }

/* 流程 —— 节点弹簧放大（§4） */
.flow { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; position: relative; }
.flow::before { content: ""; position: absolute; top: 32px; left: 10%; right: 10%; height: 2px; background: linear-gradient(90deg, transparent, var(--pink), var(--purple), transparent); z-index: 0; }
.flow-step { position: relative; padding: 0 16px; text-align: center; z-index: 1; }
.flow-step .node { width: 64px; height: 64px; border-radius: 50%; background: var(--bg-0); border: 2px solid var(--pink); display: grid; place-items: center; margin: 0 auto 20px; position: relative; font-weight: 700; color: var(--pink-deep); box-shadow: var(--shadow-sm); transition: transform var(--dur-base) var(--ease-spring-bounce), box-shadow var(--dur-base) var(--ease-spring), background var(--dur-base) var(--ease-spring), color var(--dur-base) var(--ease-spring); }
.flow-step:hover .node { transform: scale(1.1); box-shadow: var(--shadow-md); background: var(--grad-main); color: #fff; }
.flow-step:active .node { transform: scale(1.02); }
.flow-step h4 { font-weight: 700; font-size: 16px; letter-spacing: -.01em; margin-bottom: 8px; color: var(--fg); }
.flow-step p { font-size: 13px; color: var(--fg-2); line-height: 1.6; }

/* 特性条 */
.feat-bar { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; background: var(--bg-0); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.feat-bar .fb { padding: 28px; border-right: 1px solid var(--line); }
.feat-bar .fb:last-child { border: none; }
.feat-bar .fb .ic { width: 40px; height: 40px; border-radius: var(--r-full); display: grid; place-items: center; color: #fff; font-size: 18px; margin-bottom: 14px; }
.feat-bar .fb:nth-child(1) .ic { background: var(--grad-main); }
.feat-bar .fb:nth-child(2) .ic { background: var(--grad-warm); }
.feat-bar .fb:nth-child(3) .ic { background: var(--grad-cool); }
.feat-bar .fb:nth-child(4) .ic { background: linear-gradient(135deg, var(--purple), var(--pink)); }
.feat-bar .fb h4 { font-weight: 700; font-size: 15px; margin-bottom: 6px; color: var(--fg); }
.feat-bar .fb p { font-size: 12px; color: var(--fg-2); line-height: 1.6; }

/* 编辑工具展示 */
.tools-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-top: 32px; }
.tool-card { background: var(--bg-0); border: 1px solid var(--line); border-radius: var(--r-md); padding: 20px; display: flex; gap: 14px; align-items: flex-start; transition: transform var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring); }
.tool-card:hover { transform: translateY(-2px); border-color: var(--pink); box-shadow: var(--shadow-sm); }
.tool-card .ic { width: 36px; height: 36px; border-radius: var(--r-full); background: var(--pink-soft); color: var(--pink-deep); display: grid; place-items: center; font-size: 16px; flex-shrink: 0; }
.tool-card .info h5 { font-size: 13px; font-weight: 700; color: var(--fg); margin-bottom: 4px; }
.tool-card .info p { font-size: 12px; color: var(--fg-2); line-height: 1.5; }
.tool-card .info kbd { font-family: ui-monospace, monospace; font-size: 10px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; color: var(--fg-2); }

/* CTA */
.cta-final { text-align: center; padding: 120px 40px; position: relative; overflow: hidden; }
.cta-bg { position: absolute; inset: 0; background: radial-gradient(circle at 30% 50%, rgba(255,143,171,.12), transparent 50%), radial-gradient(circle at 70% 50%, rgba(195,162,232,.12), transparent 50%); }
.cta-inner { position: relative; z-index: 2; max-width: 680px; margin: 0 auto; }
.cta-inner h2 { font-weight: 700; font-size: clamp(36px, 4.5vw, 54px); line-height: 1.1; letter-spacing: -.02em; margin-bottom: 20px; color: var(--fg); }
.cta-inner h2 em { font-style: normal; background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cta-inner p { font-size: 17px; color: var(--fg-2); margin-bottom: 36px; line-height: 1.7; }

/* 品牌色卡区 —— 弹簧 hover（§4） */
.brands { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.brand-card { background: var(--bg-0); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 28px; transition: transform var(--dur-base) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring); box-shadow: var(--shadow-sm); overflow: hidden; position: relative; }
.brand-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--pink); }
.brand-card .b-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 20px; }
.brand-card .b-name { font-weight: 700; font-size: 22px; letter-spacing: -.015em; color: var(--fg); }
.brand-card .b-meta { font-family: ui-monospace, monospace; font-size: 11px; color: var(--pink-deep); background: var(--pink-soft); padding: 4px 10px; border-radius: var(--r-full); }
.brand-card .b-strip { display: flex; gap: 5px; height: 40px; border-radius: var(--r-full); overflow: hidden; margin-bottom: 16px; }
.brand-card .b-strip i { flex: 1; transition: flex var(--dur-base) var(--ease-spring); }
.brand-card .b-strip i:hover { flex: 2; }
.brand-card .b-desc { font-size: 13px; color: var(--fg-2); line-height: 1.7; }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 48px 40px 32px; background: var(--bg-2); }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1320px; margin: 0 auto 40px; }
.foot-brand p { color: var(--fg-2); font-size: 13px; line-height: 1.7; margin-top: 16px; max-width: 300px; }
.foot-col h5 { font-size: 12px; color: var(--fg-3); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 16px; font-weight: 700; }
.foot-col a { display: block; color: var(--fg-2); font-size: 13px; margin-bottom: 10px; transition: .15s; }
.foot-col a:hover { color: var(--pink-deep); }
.foot-bottom { display: flex; justify-content: space-between; align-items: center; max-width: 1320px; margin: 0 auto; padding-top: 24px; border-top: 1px solid var(--line); font-family: ui-monospace, monospace; font-size: 11px; color: var(--fg-3); }

/* 滚动渐显 —— Apple 弹簧曲线（§4 critically damped）
   渐进增强：默认可见；仅当 JS 成功接管（html.js）后才隐藏，避免脚本异常整页空白（D-05） */
.reveal { opacity: 1; transform: none; }
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity var(--dur-slow) var(--ease-spring), transform var(--dur-slow) var(--ease-spring); }
.js .reveal.in { opacity: 1; transform: none; }

@media(max-width:980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .pixel-art { max-width: 380px; margin: 40px auto 0; }
  .feat-grid, .brands, .tools-grid { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2,1fr); gap: 32px 0; }
  .flow::before { display: none; }
  .feat-bar { grid-template-columns: repeat(2,1fr); }
  .feat-bar .fb { border-bottom: 1px solid var(--line); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

/* ========== 无障碍：减少动效 / 减少透明度 / 增强对比（Apple §14） ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .float-bead { animation: none; }
}
@media (prefers-reduced-transparency: reduce) {
  .topbar, .pixel-tag { background: var(--bg-0) !important; backdrop-filter: none !important; -webkit-backdrop-filter: none !important; }
}
@media (prefers-contrast: more) {
  .btn-ghost, .feat, .brand-card, .tool-card, .feat-bar, .pixel-grid { border-color: var(--fg-2) !important; }
  .topbar { border-color: var(--fg-2) !important; }
}