/* ============================================================
   河马 · 个人IP网站  —  设计令牌与基础
   河马·活力人格：暖白底 + 珊瑚橙 + 河马丁香紫 + 深青信任色
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 颜色 */
  --cream:      #FBF7F1;   /* 页面暖白底 */
  --paper:      #FFFFFF;   /* 卡片/浮层 */
  --sand:       #F4EDE2;   /* 次级浅底 */
  --ink:        #221C18;   /* 正文墨色（暖近黑） */
  --ink-soft:   #574C42;   /* 次级文字 */
  --mute:       #8C8175;   /* 辅助/说明文字 */
  --line:       #E8DCC9;   /* 暖色描边 */
  --line-soft:  #F0E7D8;

  --coral:      #FF6A43;   /* 主强调色·活力 */
  --coral-deep: #DB4A21;   /* 强调·深（悬停/对比） */
  --coral-tint: #FFE7DD;   /* 强调·浅底 */
  --lilac:      #8C7BB6;   /* 河马丁香紫·品牌辅色 */
  --lilac-deep: #6A5896;
  --lilac-tint: #ECE6F6;
  --teal:       #2C6B66;   /* 深青·toB信任色 */
  --teal-tint:  #DDEDEB;

  /* 圆角 */
  --r-xs: 8px;
  --r-sm: 12px;
  --r:    16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --r-pill: 999px;

  /* 阴影（暖、柔） */
  --shadow-xs: 0 1px 2px rgba(80, 52, 30, .06);
  --shadow-sm: 0 4px 14px rgba(80, 52, 30, .07);
  --shadow:    0 12px 32px rgba(80, 52, 30, .10);
  --shadow-lg: 0 24px 60px rgba(80, 52, 30, .14);

  /* 字体 */
  --font-display: "Space Grotesk", "PingFang SC", "HarmonyOS Sans SC",
                  "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-body:    "Space Grotesk", "PingFang SC", "HarmonyOS Sans SC",
                  "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "Cascadia Code",
                  "SFMono-Regular", Menlo, monospace;

  /* 字号 */
  --fs-hero: clamp(2.7rem, 7.5vw, 5.25rem);
  --fs-h1:   clamp(2.05rem, 4.6vw, 3.25rem);
  --fs-h2:   clamp(1.6rem, 3.2vw, 2.5rem);
  --fs-h3:   clamp(1.2rem, 1.8vw, 1.45rem);
  --fs-lead: clamp(1.1rem, 1.6vw, 1.32rem);
  --fs-body: 1.0625rem;
  --fs-sm:   .9rem;
  --fs-xs:   .78rem;

  /* 间距 */
  --container: 1180px;
  --gutter: clamp(1.1rem, 4vw, 2rem);
  --section-y: clamp(3.5rem, 8vw, 7rem);

  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; padding: 0; }
input, textarea { font: inherit; }
:focus-visible { outline: 2.5px solid var(--coral); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--coral); color: #fff; }

/* ---------- 基础排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
}
p { color: var(--ink-soft); }
strong { color: var(--ink); font-weight: 600; }

.lead { font-size: var(--fs-lead); line-height: 1.6; color: var(--ink-soft); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--coral-deep);
  display: inline-flex;
  align-items: center;
  gap: .5em;
}
.eyebrow::before { content: "//"; color: var(--lilac); opacity: .8; }
.eyebrow.muted { color: var(--mute); }

.mono { font-family: var(--font-mono); }

/* 强调内联 */
.hl { color: var(--coral-deep); font-weight: 600; }
.hl-lilac { color: var(--lilac-deep); font-weight: 600; }
.hl-teal { color: var(--teal); font-weight: 600; }
.under {
  background-image: linear-gradient(transparent 62%, var(--coral-tint) 62%);
  padding: 0 .08em;
}

/* ---------- 布局原语 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: 1320px; }
.container--narrow { max-width: 820px; }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }

.section-head { max-width: 760px; margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: var(--fs-h2); margin-top: .7rem; }
.section-head p { margin-top: 1rem; font-size: var(--fs-lead); }

.grid { display: grid; gap: clamp(1rem, 2.5vw, 1.6rem); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  padding: .85em 1.5em;
  border-radius: var(--r-pill);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              background .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
  line-height: 1;
}
.btn svg { width: 1.1em; height: 1.1em; }
.btn-primary { background: var(--coral); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--coral-deep); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-ink { background: var(--ink); color: var(--cream); }
.btn-ink:hover { background: #342a24; transform: translateY(-2px); }
.btn-ghost { background: var(--paper); color: var(--ink); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn-soft { background: var(--coral-tint); color: var(--coral-deep); }
.btn-soft:hover { background: #ffd9cc; transform: translateY(-2px); }
.btn-lg { font-size: 1.08rem; padding: 1em 1.9em; }
.btn-block { width: 100%; }

.link-arrow {
  display: inline-flex; align-items: center; gap: .4em;
  font-weight: 600; color: var(--coral-deep);
  font-family: var(--font-display);
}
.link-arrow svg { width: 1.05em; height: 1.05em; transition: transform .25s var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ============================================================
   头部 / 导航
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251, 247, 241, .82);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s, box-shadow .3s;
}
.site-header.scrolled { border-color: var(--line); box-shadow: var(--shadow-xs); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--font-display); font-weight: 700; font-size: 1.18rem; letter-spacing: -.01em; }
.brand-mark { width: 38px; height: 38px; flex-shrink: 0; }
.brand:hover .brand-mark { transform: rotate(-4deg) scale(1.04); }
.brand-mark { transition: transform .3s var(--ease); }

.nav-links { display: flex; align-items: center; gap: .3rem; }
.nav-links a {
  font-family: var(--font-display); font-weight: 500; font-size: .96rem;
  padding: .5rem .85rem; border-radius: var(--r-pill);
  color: var(--ink-soft); transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--ink); background: var(--sand); }
.nav-links a.active { color: var(--coral-deep); }
.nav-cta { margin-left: .5rem; }
.nav-cta .btn { padding: .6em 1.2em; font-size: .92rem; }

.nav-toggle {
  display: none; width: 44px; height: 44px; border-radius: var(--r-sm);
  align-items: center; justify-content: center;
}
.nav-toggle:hover { background: var(--sand); }
.nav-toggle span {
  position: relative; width: 22px; height: 2px; background: var(--ink); border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 22px; height: 2px;
  background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease);
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle span::after { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; inset: 68px 0 0 0;
    flex-direction: column; align-items: stretch; justify-content: flex-start;
    gap: .25rem; padding: 1.5rem var(--gutter) 2rem;
    background: var(--cream);
    transform: translateX(100%); transition: transform .35s var(--ease);
    height: auto; overflow-y: auto;
  }
  .nav-links a { font-size: 1.15rem; padding: .9rem 1rem; border-radius: var(--r-sm); }
  .nav-links a:hover { background: var(--sand); }
  .nav-cta { margin: .75rem 0 0; }
  .nav-cta .btn { width: 100%; padding: 1em; font-size: 1.05rem; }
  body.nav-open .nav-links { transform: translateX(0); }
  body.nav-open { overflow: hidden; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--ink);
  color: #E7DDCD;
  padding-block: clamp(3rem, 6vw, 4.5rem) 2rem;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: clamp(2rem, 4vw, 3.5rem);
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 2rem; } }
.footer-brand .brand { color: #FBF7F1; font-size: 1.3rem; }
.footer-brand p { color: #B8A991; margin-top: 1rem; max-width: 34ch; font-size: .95rem; }
.footer-col h4 {
  font-family: var(--font-mono); font-size: var(--fs-xs); font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: var(--coral);
  margin-bottom: 1.1rem;
}
.footer-col ul li { margin-bottom: .65rem; }
.footer-col a { color: #D6C8B0; font-size: .96rem; transition: color .2s; display: inline-flex; align-items: center; gap: .5em; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  margin-top: clamp(2.5rem, 5vw, 3.5rem); padding-top: 1.6rem;
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  font-size: .85rem; color: #9A8B74;
}
.footer-bottom .mono { opacity: .8; }

/* ============================================================
   通用组件
   ============================================================ */

/* 卡片 */
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.4rem, 2.4vw, 1.9rem);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  position: relative;
}
.card.hover:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--coral-tint); }

/* 通用标签 chip */
.chip {
  display: inline-flex; align-items: center; gap: .4em;
  font-family: var(--font-mono); font-size: .72rem; font-weight: 500;
  padding: .35em .8em; border-radius: var(--r-pill);
  background: var(--sand); color: var(--ink-soft);
  letter-spacing: .02em;
}
.chip--coral { background: var(--coral-tint); color: var(--coral-deep); }
.chip--lilac { background: var(--lilac-tint); color: var(--lilac-deep); }
.chip--teal  { background: var(--teal-tint); color: var(--teal); }

/* 大数字统计 */
.stat { display: flex; flex-direction: column; gap: .25rem; }
.stat-num {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.9rem); line-height: 1;
  color: var(--ink); letter-spacing: -.03em;
}
.stat-num .unit { font-size: .5em; color: var(--mute); font-weight: 500; margin-left: .15em; }
.stat-num.coral { color: var(--coral-deep); }
.stat-num.lilac { color: var(--lilac-deep); }
.stat-num.teal { color: var(--teal); }
.stat-label { font-size: var(--fs-sm); color: var(--mute); }

/* 序号徽标 */
.num-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--r-sm);
  background: var(--ink); color: var(--cream);
  font-family: var(--font-mono); font-weight: 600; font-size: 1rem;
  flex-shrink: 0;
}

/* 区块分隔的暖色"波形"装饰 */
.blob {
  position: absolute; border-radius: 50%; filter: blur(60px);
  opacity: .5; pointer-events: none; z-index: 0;
}

/* 滚动揭示 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none; }
}

/* ---------- 首页 HERO ---------- */
.hero {
  position: relative; overflow: hidden;
  padding-block: clamp(3rem, 7vw, 5.5rem) clamp(3rem, 6vw, 5rem);
}
.hero .blob-coral { width: 420px; height: 420px; background: var(--coral); top: -120px; right: -100px; opacity: .14; }
.hero .blob-lilac { width: 380px; height: 380px; background: var(--lilac); bottom: -140px; left: -120px; opacity: .18; }

.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.15fr .85fr;
  gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
@media (max-width: 900px) { .hero-inner { grid-template-columns: 1fr; } }

.hero-copy h1 {
  font-size: var(--fs-hero); margin-top: 1.2rem;
  line-height: 1.04;
}
.hero-copy h1 .hippo-word {
  position: relative; display: inline-block; color: var(--coral-deep);
}
.hero-tag {
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .45em 1em .45em .5em; border-radius: var(--r-pill);
  background: var(--paper); border: 1px solid var(--line);
  font-size: var(--fs-sm); color: var(--ink-soft); box-shadow: var(--shadow-xs);
}
.hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--coral); box-shadow: 0 0 0 4px var(--coral-tint); }
.hero-sub {
  margin-top: 1.5rem; font-size: var(--fs-lead); max-width: 46ch; color: var(--ink-soft);
}
.hero-roles { display: flex; flex-wrap: wrap; gap: .5rem .4rem; margin-top: 1.4rem; }
.hero-roles .chip { background: var(--paper); border: 1px solid var(--line); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.hero-meta {
  margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: 1.6rem; border-top: 1px dashed var(--line);
}

/* hero 右侧：河马 + 浮动卡片视觉 */
.hero-visual { position: relative; min-height: 380px; display: flex; align-items: center; justify-content: center; }
.hero-art {
  width: 100%; border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
}
@media (max-width: 900px) { .hero-visual { min-height: auto; } }
.hippo-stage { position: relative; width: 100%; max-width: 380px; }
.hippo-stage .hippo-big { width: 100%; filter: drop-shadow(0 24px 40px rgba(108, 88, 150, .28)); }
.float-card {
  position: absolute; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r); padding: .8rem 1rem; box-shadow: var(--shadow);
  font-size: .85rem; display: flex; align-items: center; gap: .6rem;
  animation: floaty 5s ease-in-out infinite;
}
.float-card .fc-ico { width: 30px; height: 30px; border-radius: var(--r-xs); display: grid; place-items: center; flex-shrink: 0; }
.float-card strong { font-family: var(--font-display); font-size: .9rem; }
.float-card span { display: block; font-size: .72rem; color: var(--mute); }
.fc-1 { top: 6%; left: -6%; animation-delay: 0s; }
.fc-2 { bottom: 14%; right: -8%; animation-delay: 1.2s; }
.fc-3 { bottom: -4%; left: 8%; animation-delay: 2.1s; }
@media (max-width: 520px) { .float-card { display: none; } }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@media (prefers-reduced-motion: reduce) { .float-card { animation: none; } }

/* ---------- "第三种AI公司" 对比带 ---------- */
.triple-band { background: var(--ink); color: var(--cream); border-radius: var(--r-xl); padding: clamp(1.8rem, 4vw, 3rem); }
.triple-band h2, .triple-band h3 { color: var(--cream); }
.triple-band .eyebrow { color: var(--coral); }
.triple-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 2rem; background: rgba(255,255,255,.1); border-radius: var(--r-lg); overflow: hidden; }
@media (max-width: 760px) { .triple-grid { grid-template-columns: 1fr; } }
.triple-cell { background: var(--ink); padding: clamp(1.3rem, 2.5vw, 1.9rem); }
.triple-cell .tc-num { font-family: var(--font-mono); color: var(--mute); font-size: .85rem; }
.triple-cell .tc-title { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; margin: .6rem 0 .5rem; }
.triple-cell .tc-desc { font-size: .92rem; color: #C9BBA3; line-height: 1.6; }
.triple-cell.you { background: linear-gradient(160deg, #2a2018, #221a16); }
.triple-cell.you .tc-num { color: var(--coral); }
.triple-cell.you .tc-title { color: #fff; }
.triple-cell.you .tc-desc { color: #E7DDCD; }
.triple-cell.you::after { content: "← 河马在这里"; display: block; margin-top: 1rem; font-family: var(--font-mono); font-size: .8rem; color: var(--coral); }

/* ---------- 能力三角 ---------- */
.triangle-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
@media (max-width: 880px) { .triangle-wrap { grid-template-columns: 1fr; } }
.triangle-svg { width: 100%; max-width: 460px; margin-inline: auto; }
.tri-points { display: flex; flex-direction: column; gap: 1.2rem; }
.tri-point { display: flex; gap: 1rem; align-items: flex-start; }
.tri-point .tp-ico { width: 48px; height: 48px; border-radius: var(--r-sm); display: grid; place-items: center; flex-shrink: 0; }
.tri-point h4 { font-size: 1.12rem; margin-bottom: .3rem; }
.tri-point p { font-size: .94rem; }

/* ---------- 5类成品卡片 ---------- */
.product-card { display: flex; flex-direction: column; gap: .7rem; overflow: hidden; padding: 0; }
.product-card .pc-media { position: relative; aspect-ratio: 16/7; overflow: hidden; background: var(--sand); }
.product-card .pc-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.product-card.hover:hover .pc-media img { transform: scale(1.05); }
.product-card .pc-media .pc-letter {
  position: absolute; top: .7rem; left: .7rem; margin: 0;
  width: 46px; height: 46px; font-size: 1.6rem; border-radius: var(--r-xs);
  display: grid; place-items: center; box-shadow: var(--shadow-sm);
}
.product-card .pc-head { padding: clamp(1.2rem, 2.4vw, 1.5rem) clamp(1.3rem, 2.4vw, 1.7rem) 0; }
.product-card .pc-letter {
  font-family: var(--font-display); font-weight: 700; font-size: 2.4rem; line-height: 1;
  width: 56px; height: 56px; border-radius: var(--r-sm); display: grid; place-items: center;
  margin-bottom: .8rem;
}
.product-card h3 { font-size: 1.22rem; }
.product-card .pc-one { font-size: .95rem; color: var(--ink-soft); }
.product-card .pc-body { padding: 0 clamp(1.3rem, 2.4vw, 1.7rem) clamp(1.3rem, 2.4vw, 1.7rem); margin-top: auto; }
.product-card .pc-body ul { display: flex; flex-direction: column; gap: .45rem; margin-top: .8rem; }
.product-card .pc-body li { font-size: .88rem; color: var(--ink-soft); display: flex; gap: .5em; align-items: flex-start; }
.product-card .pc-body li::before { content: "▸"; color: var(--coral); flex-shrink: 0; }
.product-card .pc-foot { padding: 1rem clamp(1.3rem, 2.4vw, 1.7rem); border-top: 1px dashed var(--line); display: flex; justify-content: space-between; align-items: center; gap: .5rem; background: var(--sand); }
.product-card .pc-foot .price { font-family: var(--font-mono); font-size: .82rem; color: var(--mute); }
.product-card .pc-foot .price strong { color: var(--ink); font-size: .92rem; }

/* 5色调 */
.t-a { background: var(--coral-tint); color: var(--coral-deep); }
.t-b { background: var(--lilac-tint); color: var(--lilac-deep); }
.t-c { background: var(--teal-tint); color: var(--teal); }
.t-d { background: #FFF1D6; color: #9A6B12; }
.t-e { background: #FDE2E4; color: #B23A48; }

/* ---------- toC / toB 双路径 ---------- */
.dualpath { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1rem, 2.5vw, 1.6rem); }
@media (max-width: 760px) { .dualpath { grid-template-columns: 1fr; } }
.dp-card {
  border-radius: var(--r-lg); padding: clamp(1.5rem, 3vw, 2.2rem);
  border: 1.5px solid var(--line); background: var(--paper);
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
  display: flex; flex-direction: column; gap: 1rem;
}
.dp-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.dp-card.c { border-color: var(--coral-tint); }
.dp-card.b { border-color: var(--teal-tint); }
.dp-tag { font-family: var(--font-mono); font-size: .78rem; font-weight: 600; letter-spacing: .06em; }
.dp-card.c .dp-tag { color: var(--coral-deep); }
.dp-card.b .dp-tag { color: var(--teal); }
.dp-card h3 { font-size: clamp(1.3rem, 2.2vw, 1.6rem); }
.dp-card .dp-list { display: flex; flex-direction: column; gap: .6rem; margin-top: .3rem; }
.dp-card .dp-list li { font-size: .94rem; color: var(--ink-soft); display: flex; gap: .6em; align-items: flex-start; }
.dp-card.c .dp-list li::before { content: "●"; color: var(--coral); font-size: .7em; margin-top: .5em; }
.dp-card.b .dp-list li::before { content: "●"; color: var(--teal); font-size: .7em; margin-top: .5em; }
.dp-card .dp-cta { margin-top: auto; }

/* ---------- 4层产品漏斗 ---------- */
.tier-list { display: flex; flex-direction: column; gap: .9rem; }
.tier {
  display: grid; grid-template-columns: 64px 1fr auto; gap: clamp(1rem, 2.5vw, 1.8rem);
  align-items: center; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: clamp(1.1rem, 2.2vw, 1.5rem);
  transition: transform .25s var(--ease), box-shadow .25s, border-color .25s;
}
.tier:hover { transform: translateX(6px); box-shadow: var(--shadow-sm); border-color: var(--coral-tint); }
.tier-level {
  width: 64px; height: 64px; border-radius: var(--r-sm); display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; color: #fff;
  flex-shrink: 0;
}
.tier h4 { font-size: 1.1rem; display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.tier h4 .tier-role { font-family: var(--font-mono); font-size: .75rem; font-weight: 500; color: var(--mute); }
.tier p { font-size: .9rem; margin-top: .25rem; }
.tier .tier-price { font-family: var(--font-mono); font-weight: 600; color: var(--ink); white-space: nowrap; text-align: right; }
.tier .tier-price .small { display: block; font-size: .72rem; color: var(--mute); font-weight: 400; }
.l1 { background: linear-gradient(135deg, #8C7BB6, #6A5896); }
.l2 { background: linear-gradient(135deg, var(--coral), var(--coral-deep)); }
.l3 { background: linear-gradient(135deg, var(--teal), #1f4f4b); }
.l4 { background: linear-gradient(135deg, #3a3a3a, var(--ink)); }
@media (max-width: 620px) {
  .tier { grid-template-columns: 52px 1fr; }
  .tier-level { width: 52px; height: 52px; font-size: 1.2rem; }
  .tier .tier-price { grid-column: 1 / -1; text-align: left; }
}

/* ---------- 案例卡 ---------- */
.case-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.case-card .cc-media { position: relative; aspect-ratio: 16/7; overflow: hidden; background: var(--sand); }
.case-card .cc-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.case-card:hover .cc-media img { transform: scale(1.05); }
.case-card .cc-media .cc-badge {
  position: absolute; top: .7rem; left: .7rem; margin: 0;
  font-family: var(--font-mono); font-size: .7rem; font-weight: 600;
  padding: .35em .7em; border-radius: var(--r-pill); background: rgba(34,28,24,.78); color: #fff;
  backdrop-filter: blur(4px);
}
.case-card .cc-top { padding: clamp(1.3rem, 2.4vw, 1.7rem); }
.case-card .cc-industry { font-family: var(--font-mono); font-size: .76rem; color: var(--mute); letter-spacing: .04em; }
.case-card h3 { font-size: 1.2rem; margin: .6rem 0 .7rem; }
.case-card .cc-one { font-size: .94rem; color: var(--ink-soft); }
.case-card .cc-deliver { padding: 0 clamp(1.3rem, 2.4vw, 1.7rem); display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1rem; }
.case-card .cc-foot { margin-top: auto; padding: 1rem clamp(1.3rem, 2.4vw, 1.7rem); border-top: 1px solid var(--line-soft); display: flex; gap: 1.2rem; flex-wrap: wrap; }
.case-card .cc-foot .stat-num { font-size: 1.35rem; }

/* ---------- 过滤器 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2rem; }
.filter-btn {
  font-family: var(--font-mono); font-size: .82rem; font-weight: 500;
  padding: .55em 1.1em; border-radius: var(--r-pill);
  border: 1.5px solid var(--line); background: var(--paper); color: var(--ink-soft);
  transition: all .2s var(--ease);
}
.filter-btn:hover { border-color: var(--ink-soft); color: var(--ink); }
.filter-btn.active { background: var(--ink); color: var(--cream); border-color: var(--ink); }

/* ---------- AI实验室作品卡 ---------- */
.lab-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.lab-card .lc-media { aspect-ratio: 16/10; background: var(--sand); position: relative; overflow: hidden; }
.lab-card .lc-media img { width: 100%; height: 100%; object-fit: cover; }
.lab-card .lc-media .lc-ph { width: 100%; height: 100%; display: grid; place-items: center; }
.lab-card .lc-badge {
  position: absolute; top: .8rem; left: .8rem;
  font-family: var(--font-mono); font-size: .7rem; font-weight: 600;
  padding: .35em .7em; border-radius: var(--r-pill); background: rgba(34,28,24,.8); color: #fff;
  backdrop-filter: blur(4px);
}
.lab-card .lc-body { padding: clamp(1.2rem, 2.2vw, 1.5rem); display: flex; flex-direction: column; gap: .7rem; flex: 1; }
.lab-card h3 { font-size: 1.16rem; }
.lab-card .lc-desc { font-size: .9rem; color: var(--ink-soft); }
.lab-card .lc-tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; }

/* ---------- 金句墙 ---------- */
.quote-wall { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1rem, 2.5vw, 1.5rem); }
@media (max-width: 700px) { .quote-wall { grid-template-columns: 1fr; } }
.quote-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: clamp(1.4rem, 2.6vw, 1.9rem); position: relative; transition: transform .3s var(--ease), box-shadow .3s;
}
.quote-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.quote-card::before {
  content: """; position: absolute; top: -.2rem; left: .9rem;
  font-family: Georgia, serif; font-size: 4rem; line-height: 1; color: var(--coral-tint);
}
.quote-card p { position: relative; font-size: 1.02rem; color: var(--ink); line-height: 1.6; font-weight: 500; }
.quote-card .q-tag { display: block; margin-top: 1rem; font-family: var(--font-mono); font-size: .76rem; color: var(--mute); }

/* ---------- 平台卡 ---------- */
.platform-card {
  display: flex; flex-direction: column; gap: .8rem; padding: clamp(1.4rem, 2.6vw, 1.9rem);
  border-radius: var(--r-lg); border: 1.5px solid var(--line); background: var(--paper);
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
}
.platform-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.platform-card .pl-head { display: flex; align-items: center; gap: .8rem; }
.platform-card .pl-ico { width: 46px; height: 46px; border-radius: var(--r-sm); display: grid; place-items: center; flex-shrink: 0; }
.platform-card .pl-name { font-family: var(--font-display); font-weight: 700; font-size: 1.08rem; }
.platform-card .pl-handle { font-size: .82rem; color: var(--mute); font-family: var(--font-mono); }
.platform-card .pl-desc { font-size: .92rem; color: var(--ink-soft); }
.platform-card .pl-role { font-family: var(--font-mono); font-size: .72rem; color: var(--coral-deep); margin-top: auto; padding-top: .5rem; border-top: 1px dashed var(--line); }

/* ---------- CTA 大横幅 ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--coral) 0%, var(--coral-deep) 100%);
  border-radius: var(--r-xl); padding: clamp(2.2rem, 5vw, 3.5rem);
  color: #fff; position: relative; overflow: hidden;
  display: grid; grid-template-columns: 1.4fr .9fr; gap: 2rem; align-items: center;
}
@media (max-width: 760px) { .cta-band { grid-template-columns: 1fr; } }
.cta-band::before { content: ""; position: absolute; width: 360px; height: 360px; border-radius: 50%; background: rgba(255,255,255,.12); top: -160px; right: -80px; }
.cta-band h2 { color: #fff; font-size: var(--fs-h2); position: relative; }
.cta-band p { color: rgba(255,255,255,.92); margin-top: .8rem; font-size: var(--fs-lead); position: relative; }
.cta-band .cta-actions { position: relative; display: flex; flex-direction: column; gap: .8rem; }
.cta-band .btn-primary { background: var(--ink); color: #fff; }
.cta-band .btn-primary:hover { background: #000; }
.cta-band .btn-ghost { background: rgba(255,255,255,.15); color: #fff; border-color: rgba(255,255,255,.4); }
.cta-band .btn-ghost:hover { background: rgba(255,255,255,.25); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  text-align: left; padding: 1.3rem 0; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--ink);
}
.faq-q .faq-ico { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--line); display: grid; place-items: center; transition: transform .3s var(--ease), background .2s; font-size: 1.2rem; color: var(--coral-deep); }
.faq-item.open .faq-ico { transform: rotate(45deg); background: var(--coral); color: #fff; border-color: var(--coral); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s var(--ease); }
.faq-a-inner { padding-bottom: 1.3rem; color: var(--ink-soft); font-size: .98rem; max-width: 70ch; }

/* ---------- 步骤流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1rem, 2vw, 1.4rem); counter-reset: step; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-top: 2.6rem; }
.step .step-num {
  position: absolute; top: 0; left: 0;
  font-family: var(--font-display); font-weight: 700; font-size: 2rem; color: var(--coral-tint);
  line-height: 1;
}
.step h4 { font-size: 1.05rem; margin-bottom: .4rem; }
.step p { font-size: .9rem; }
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 1rem; left: calc(100% - 1rem); width: 2rem; height: 2px;
  background: var(--line);
}
@media (max-width: 760px) { .step:not(:last-child)::after { display: none; } }

/* ---------- about hero / 大段叙述 ---------- */
.prose-narrow { max-width: 68ch; }
.prose-narrow p { font-size: 1.06rem; line-height: 1.8; margin-bottom: 1.1rem; }
.prose-narrow h3 { font-size: 1.4rem; margin: 2.2rem 0 .9rem; }

.principle-list { display: flex; flex-direction: column; gap: 1rem; }
.principle { display: flex; gap: 1rem; align-items: baseline; padding: 1.1rem 0; border-bottom: 1px dashed var(--line); }
.principle .p-key { font-family: var(--font-mono); font-size: .85rem; color: var(--coral-deep); font-weight: 600; flex-shrink: 0; min-width: 80px; }
.principle .p-val { font-size: 1.02rem; color: var(--ink); }

/* ---------- 通用 hero(内页) ---------- */
.page-hero { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 4vw, 3rem); position: relative; overflow: hidden; }
.page-hero .blob-coral { width: 360px; height: 360px; background: var(--coral); top: -120px; right: -80px; opacity: .12; }
.page-hero h1 { font-size: var(--fs-h1); margin-top: 1rem; max-width: 18ch; }
.page-hero p { font-size: var(--fs-lead); margin-top: 1.2rem; max-width: 60ch; }
.breadcrumb { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--mute); letter-spacing: .04em; }
.breadcrumb a:hover { color: var(--coral-deep); }

/* 色块标识 */
.tag-row { display: flex; flex-wrap: wrap; gap: .5rem; }

/* 工具：文字居中、间距 */
.text-center { text-align: center; }
.mt-1 { margin-top: .5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.6rem; } .mt-4 { margin-top: 2.4rem; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; } .items-center { align-items: center; } .gap-1 { gap: .5rem; } .gap-2 { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }
.divider { height: 1px; background: var(--line); border: none; margin-block: clamp(2rem, 5vw, 4rem); }

/* 可访问性：屏幕阅读器专用 */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ---------- 页面级响应式覆盖（内联栅格在窄屏折叠为单列） ---------- */
@media (max-width: 760px) {
  .card[style*="64px 1fr"] { grid-template-columns: 1fr !important; }
  .card[style*="1.1fr 1fr"] { grid-template-columns: 1fr !important; }
  .card[style*="1.1fr 1fr"] > div:first-child { min-height: 240px; }
}
@media (max-width: 880px) {
  .grid[style*="1fr 1.3fr"] { grid-template-columns: 1fr !important; }
}