/* ==========================================================================
   云南东汇知识产权运营有限公司 — 官网样式
   设计基调：宣纸底 + 靛蓝扎染 + 丹霞橙 + 孔雀绿，文脉取自云南少数民族织锦
   ========================================================================== */

/* --- 1. 设计令牌 ------------------------------------------------------- */
:root {
  /* 色彩 */
  --paper:      #FBF8F3;   /* 宣纸白 */
  --paper-2:    #F4EFE6;
  --card:       #FFFFFF;
  --ink:        #1C2A38;   /* 主文字 */
  --ink-2:      #4A5B6B;   /* 次文字 */
  --ink-3:      #7C8B99;   /* 弱文字 */
  --line:       #E4DCCE;
  --indigo:     #23508F;   /* 扎染靛蓝 */
  --indigo-d:   #173A6B;
  --indigo-l:   #E8EFF8;
  --danxia:     #C0502C;   /* 丹霞 */
  --danxia-l:   #FBEDE8;
  --peacock:    #1B8A6E;   /* 孔雀绿 */
  --peacock-l:  #E6F4EF;
  --gold:       #B98A2E;
  --gold-l:     #FAF3E2;

  /* 排版 */
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", "SimSun", Georgia, serif;

  /* 尺度 */
  --wrap: 1180px;
  --nav-h: 72px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;

  /* 阴影 */
  --sh-sm: 0 2px 8px rgba(28, 42, 56, .06);
  --sh-md: 0 10px 30px rgba(28, 42, 56, .08);
  --sh-lg: 0 24px 60px rgba(28, 42, 56, .12);
}

/* --- 2. 基础重置 ------------------------------------------------------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

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

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 700; line-height: 1.3; letter-spacing: .01em; }

.container { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

::selection { background: var(--indigo); color: #fff; }

/* 页面加载动画 */
.fade-up { opacity: 0; transform: translateY(26px); transition: opacity .8s cubic-bezier(.2,.7,.3,1), transform .8s cubic-bezier(.2,.7,.3,1); }
.fade-up.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .fade-up { opacity: 1; transform: none; transition: none; } }

/* --- 3. 顶部导航 ------------------------------------------------------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(251, 248, 243, .82);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, box-shadow .3s;
}
.nav.scrolled { background: rgba(255, 255, 255, .92); border-bottom-color: var(--line); box-shadow: var(--sh-sm); }

.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark { width: 40px; height: 40px; flex-shrink: 0; }
.brand-txt b { display: block; font-family: var(--font-serif); font-size: 17px; letter-spacing: .06em; line-height: 1.2; }
.brand-txt span { display: block; font-size: 10.5px; color: var(--ink-3); letter-spacing: .22em; text-transform: uppercase; }

.menu { display: flex; align-items: center; gap: 4px; }
.menu a {
  position: relative; padding: 8px 14px; border-radius: 999px;
  font-size: 14.5px; color: var(--ink-2); transition: color .25s, background .25s;
}
.menu a:hover { color: var(--indigo); background: var(--indigo-l); }
.menu a.on { color: var(--indigo); font-weight: 600; }

.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 999px; white-space: nowrap;
  background: var(--indigo); color: #fff; font-size: 14px; font-weight: 600;
  box-shadow: 0 6px 16px rgba(35, 80, 143, .24); transition: transform .25s, background .25s, box-shadow .25s;
}
.nav-cta:hover { background: var(--indigo-d); transform: translateY(-2px); box-shadow: 0 10px 22px rgba(35, 80, 143, .3); }

.burger { display: none; width: 42px; height: 42px; border-radius: 10px; }
.burger span { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--ink); border-radius: 2px; transition: .3s; }

/* --- 4. 通用组件 ------------------------------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; letter-spacing: .18em; color: var(--danxia);
  text-transform: uppercase; font-weight: 600; margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--danxia); border-radius: 2px; }

.sec-head { max-width: 720px; margin-bottom: 52px; }
.sec-head h2 { font-size: clamp(28px, 3.6vw, 42px); margin-bottom: 16px; }
.sec-head h2 em { font-style: normal; color: var(--indigo); position: relative; }
.sec-head h2 em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 10px;
  background: rgba(35, 80, 143, .12); z-index: -1; border-radius: 3px;
}
.sec-head p { color: var(--ink-2); font-size: 16.5px; }

.section { padding: 104px 0; position: relative; }
.section.tight { padding: 80px 0; }
.section.alt { background: var(--paper-2); }
.section.dark { background: var(--ink); color: #E8E4DC; }
.section.dark .sec-head p { color: #A9B6C2; }
.section.dark .sec-head h2 { color: #fff; }
.section.dark .sec-head h2 em { color: #8FB6E8; }
.section.dark .sec-head h2 em::after { background: rgba(143, 182, 232, .18); }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 30px; border-radius: 999px; font-size: 15px; font-weight: 600;
  transition: transform .25s, box-shadow .25s, background .25s, color .25s, border-color .25s;
}
.btn svg { transition: transform .25s; }
.btn:hover svg { transform: translateX(4px); }
.btn-primary { background: var(--indigo); color: #fff; box-shadow: 0 10px 26px rgba(35, 80, 143, .26); }
.btn-primary:hover { background: var(--indigo-d); transform: translateY(-3px); box-shadow: 0 16px 34px rgba(35, 80, 143, .32); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--indigo); color: var(--indigo); transform: translateY(-3px); }
.section.dark .btn-ghost { background: transparent; border-color: rgba(255,255,255,.22); color: #fff; }
.section.dark .btn-ghost:hover { border-color: #8FB6E8; color: #8FB6E8; }

/* 标签 */
.tag {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: .02em;
}
.tag.blue  { background: var(--indigo-l); color: var(--indigo); }
.tag.red   { background: var(--danxia-l); color: var(--danxia); }
.tag.green { background: var(--peacock-l); color: var(--peacock); }
.tag.gold  { background: var(--gold-l); color: var(--gold); }

/* --- 5. Hero ----------------------------------------------------------- */
.hero {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-h) + 92px) 0 108px;
  background:
    radial-gradient(1100px 560px at 88% -8%, rgba(35, 80, 143, .12), transparent 62%),
    radial-gradient(760px 460px at 6% 12%, rgba(192, 80, 44, .09), transparent 60%),
    linear-gradient(180deg, #FDFBF7, var(--paper));
}
.hero-pattern {
  position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-repeat: repeat; background-size: 132px 132px;
}
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.06fr .94fr; gap: 60px; align-items: center; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 26px;
  padding: 7px 16px 7px 8px; border-radius: 999px; background: #fff;
  border: 1px solid var(--line); box-shadow: var(--sh-sm); font-size: 13.5px; color: var(--ink-2);
}
.hero-badge b { color: var(--indigo); font-weight: 600; }
.hero-badge i {
  font-style: normal; font-size: 11px; font-weight: 700; letter-spacing: .08em;
  background: var(--danxia); color: #fff; padding: 3px 9px; border-radius: 999px;
}

.hero h1 { font-size: clamp(36px, 5.2vw, 62px); line-height: 1.16; margin-bottom: 24px; letter-spacing: .005em; }
.hero h1 .l2 { display: block; color: var(--indigo); }
.hero h1 .l3 {
  display: block; margin-top: 6px; font-size: .52em; color: var(--danxia);
  letter-spacing: .12em; font-weight: 600;
}
.hero-lead { font-size: 17px; color: var(--ink-2); max-width: 540px; margin-bottom: 34px; }
.hero-lead b { color: var(--ink); font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 48px; }

.hero-stats { display: flex; flex-wrap: wrap; gap: 34px; }
.hero-stats div b {
  display: block; font-family: var(--font-serif); font-size: 32px; color: var(--indigo); line-height: 1.1;
}
.hero-stats div span { font-size: 13px; color: var(--ink-3); letter-spacing: .04em; }

/* Hero 视觉 */
.hero-visual { position: relative; }
.hero-card {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  background: #fff; box-shadow: var(--sh-lg); border: 1px solid var(--line);
}
.hero-card .art { width: 100%; height: auto; display: block; }
.hero-float {
  position: absolute; display: flex; align-items: center; gap: 12px;
  padding: 13px 18px; border-radius: 16px; background: rgba(255,255,255,.95);
  box-shadow: var(--sh-md); border: 1px solid rgba(228,220,206,.8);
  animation: floaty 5s ease-in-out infinite;
}
.hero-float .ic { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; flex-shrink: 0; }
.hero-float b { display: block; font-size: 14px; font-family: var(--font-serif); }
.hero-float span { font-size: 11.5px; color: var(--ink-3); }
.hero-float.f1 { left: -26px; top: 16%; }
.hero-float.f2 { right: -22px; bottom: 13%; animation-delay: 2.2s; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-13px); } }

.scroll-hint {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-size: 11.5px; letter-spacing: .2em; color: var(--ink-3); text-transform: uppercase;
}
.scroll-hint i { display: block; width: 1px; height: 40px; background: linear-gradient(var(--ink-3), transparent); animation: drop 2s infinite; }
@keyframes drop { 0% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } 51% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* --- 6. 业务板块 ------------------------------------------------------- */
.biz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.biz-card {
  position: relative; padding: 42px 38px 38px; border-radius: var(--r-lg); background: var(--card);
  border: 1px solid var(--line); box-shadow: var(--sh-sm); overflow: hidden;
  transition: transform .4s cubic-bezier(.2,.7,.3,1), box-shadow .4s, border-color .4s;
}
.biz-card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%;
  background: linear-gradient(90deg, var(--indigo), var(--danxia)); transform: scaleX(0); transform-origin: left;
  transition: transform .5s;
}
.biz-card:hover { transform: translateY(-8px); box-shadow: var(--sh-lg); border-color: transparent; }
.biz-card:hover::before { transform: scaleX(1); }
.biz-card .ic {
  width: 58px; height: 58px; border-radius: 17px; display: grid; place-items: center; margin-bottom: 24px;
  background: var(--indigo-l);
}
.biz-card.alt .ic { background: var(--danxia-l); }
.biz-card h3 { font-size: 24px; margin-bottom: 12px; }
.biz-card > p { color: var(--ink-2); margin-bottom: 24px; }
.biz-list { display: grid; gap: 12px; margin-bottom: 26px; }
.biz-list li { display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; color: var(--ink-2); }
.biz-list li::before {
  content: ""; width: 7px; height: 7px; margin-top: 8px; border-radius: 2px; flex-shrink: 0;
  background: var(--indigo); transform: rotate(45deg);
}
.biz-card.alt .biz-list li::before { background: var(--danxia); }
.biz-card .more { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--indigo); }
.biz-card.alt .more { color: var(--danxia); }
.biz-card .more svg { transition: transform .25s; }
.biz-card:hover .more svg { transform: translateX(5px); }

/* 双栏（关于我们 / 联系方式） */
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 32px; align-items: start; }
.split.even { grid-template-columns: 1.15fr .85fr; }

/* --- 7. 民族特色 ------------------------------------------------------- */
.ethnic { position: relative; overflow: hidden; background: var(--ink); color: #EDE9E1; }
.ethnic-tex { position: absolute; inset: 0; opacity: .07; pointer-events: none; }
.ethnic-inner { position: relative; z-index: 2; }
.ethnic-head { max-width: 760px; margin-bottom: 56px; }
.ethnic-head h2 { font-size: clamp(28px, 3.6vw, 42px); color: #fff; margin-bottom: 16px; }
.ethnic-head h2 em { font-style: normal; color: #E8A87C; }
.ethnic-head p { color: #A9B6C2; }

.eth-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.eth-card {
  padding: 34px 26px; border-radius: var(--r-md); text-align: center;
  background: rgba(255,255,255,.045); border: 1px solid rgba(255,255,255,.09);
  transition: transform .4s, background .4s, border-color .4s;
}
.eth-card:hover { transform: translateY(-8px); background: rgba(255,255,255,.08); border-color: rgba(232,168,124,.4); }
.eth-card .ic { width: 60px; height: 60px; margin: 0 auto 18px; }
.eth-card h4 { font-size: 19px; color: #fff; margin-bottom: 8px; }
.eth-card p { font-size: 14px; color: #A9B6C2; }

.eth-note {
  margin-top: 48px; padding: 26px 32px; border-radius: var(--r-md); display: flex; gap: 18px; align-items: center;
  background: rgba(232, 168, 124, .09); border: 1px solid rgba(232, 168, 124, .22);
}
.eth-note b { color: #E8A87C; font-family: var(--font-serif); font-size: 17px; }
.eth-note p { font-size: 14.5px; color: #C6CFd8; }

/* --- 8. 流程 ----------------------------------------------------------- */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: s; }
.flow-step { position: relative; padding: 30px 22px 30px 0; counter-increment: s; }
.flow-step::after {
  content: ""; position: absolute; right: 22px; top: 58px; width: calc(100% - 74px); height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 6px, transparent 6px 12px);
}
.flow-step:last-child::after { display: none; }
.flow-num {
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; margin-bottom: 18px;
  background: var(--indigo-l); color: var(--indigo); font-family: var(--font-serif); font-weight: 700; font-size: 17px;
  position: relative; z-index: 2;
}
.flow-step h4 { font-size: 18px; margin-bottom: 8px; }
.flow-step p { font-size: 14px; color: var(--ink-2); }

/* --- 9. 案例 / 作品 ---------------------------------------------------- */
.work-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.work-card {
  border-radius: var(--r-md); overflow: hidden; background: var(--card);
  border: 1px solid var(--line); transition: transform .4s, box-shadow .4s;
}
.work-card:hover { transform: translateY(-8px); box-shadow: var(--sh-md); }
.work-thumb { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: var(--paper-2); }
.work-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.work-card:hover .work-thumb img { transform: scale(1.06); }
.work-thumb .tag { position: absolute; left: 14px; top: 14px; background: rgba(255,255,255,.94); backdrop-filter: blur(4px); }
.work-body { padding: 22px 24px 26px; }
.work-body h4 { font-size: 18px; margin-bottom: 8px; }
.work-body p { font-size: 14px; color: var(--ink-2); }
.work-meta { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); display: flex; justify-content: space-between; font-size: 12.5px; color: var(--ink-3); }

/* --- 10. 优势 / 数据 --------------------------------------------------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv-card { padding: 32px 26px; border-radius: var(--r-md); background: #fff; border: 1px solid var(--line); transition: border-color .3s, box-shadow .3s; }
.adv-card:hover { border-color: rgba(35,80,143,.35); box-shadow: var(--sh-md); }
.adv-card .n { font-family: var(--font-serif); font-size: 15px; color: var(--danxia); letter-spacing: .1em; margin-bottom: 14px; }
.adv-card h4 { font-size: 19px; margin-bottom: 10px; }
.adv-card p { font-size: 14.5px; color: var(--ink-2); }

.stat-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-band div b { display: block; font-family: var(--font-serif); font-size: clamp(34px, 4vw, 50px); color: #E8A87C; line-height: 1.1; }
.stat-band div span { font-size: 14.5px; color: #A9B6C2; }

/* --- 11. 合作 / CTA --------------------------------------------------- */
.cta-band {
  position: relative; overflow: hidden; border-radius: var(--r-lg);
  padding: 62px 58px; background: linear-gradient(135deg, var(--indigo-d), var(--indigo) 52%, #2E63A8);
  color: #fff; display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
}
.cta-band::after { content: ""; position: absolute; right: -60px; top: -60px; width: 300px; height: 300px; border-radius: 50%; background: rgba(255,255,255,.06); }
.cta-band h2 { color: #fff; font-size: clamp(25px, 3vw, 36px); margin-bottom: 12px; }
.cta-band p { color: #D2DEEC; max-width: 560px; }
.cta-band .btn { background: #fff; color: var(--indigo); position: relative; z-index: 2; box-shadow: 0 10px 26px rgba(0,0,0,.18); }
.cta-band .btn:hover { transform: translateY(-3px); }

/* --- 12. 表单 ---------------------------------------------------------- */
.form-card { padding: 40px; border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line); box-shadow: var(--sh-md); }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 8px; }
.field label i { color: var(--danxia); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 15px; border-radius: var(--r-sm); font-family: inherit; font-size: 15px;
  color: var(--ink); background: var(--paper); border: 1.5px solid var(--line); transition: border-color .25s, background .25s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--indigo); background: #fff; }
.field textarea { resize: vertical; min-height: 118px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-tip { font-size: 13px; color: var(--ink-3); margin-top: 14px; }
.form-ok {
  display: none; align-items: center; gap: 10px; padding: 14px 18px; border-radius: var(--r-sm);
  background: var(--peacock-l); color: var(--peacock); font-size: 14.5px; font-weight: 600; margin-bottom: 18px;
}
.form-ok.show { display: flex; }

/* --- 13. FAQ ----------------------------------------------------------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 22px 0; text-align: left; font-size: 17px; font-family: var(--font-serif); font-weight: 700;
}
.faq-q .pm { position: relative; width: 18px; height: 18px; flex-shrink: 0; }
.faq-q .pm::before, .faq-q .pm::after { content: ""; position: absolute; background: var(--indigo); border-radius: 2px; transition: transform .3s; }
.faq-q .pm::before { left: 0; top: 8px; width: 18px; height: 2px; }
.faq-q .pm::after { left: 8px; top: 0; width: 2px; height: 18px; }
.faq-item.open .pm::after { transform: rotate(90deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .45s cubic-bezier(.2,.7,.3,1); }
.faq-a p { padding: 0 0 24px; color: var(--ink-2); font-size: 15px; max-width: 760px; }
.faq-item.open .faq-a { max-height: 260px; }

/* --- 14. 页脚 ---------------------------------------------------------- */
.footer { background: #16222E; color: #93A2B0; padding: 68px 0 0; font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 44px; padding-bottom: 48px; }
.footer .brand-txt b { color: #fff; }
.footer-col h5 { color: #fff; font-family: var(--font-serif); font-size: 16px; margin-bottom: 18px; }
.footer-col li { margin-bottom: 11px; }
.footer-col a:hover { color: #E8A87C; }
.footer-desc { margin-top: 18px; max-width: 300px; line-height: 1.85; }
.footer-ct li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; }
.footer-ct svg { flex-shrink: 0; margin-top: 4px; color: #E8A87C; }
.footer-bot {
  border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0; display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: space-between; font-size: 13px; color: #6F7F8D;
}
.footer-bot a:hover { color: #E8A87C; }

/* --- 15. 返回顶部 ------------------------------------------------------ */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90; width: 46px; height: 46px; border-radius: 50%;
  background: var(--indigo); color: #fff; display: grid; place-items: center; box-shadow: var(--sh-md);
  opacity: 0; visibility: hidden; transform: translateY(14px); transition: .35s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--indigo-d); }

/* --- 16. 移动端菜单 ---------------------------------------------------- */
.mobile-mask {
  position: fixed; inset: 0; z-index: 98; background: rgba(28,42,56,.4);
  opacity: 0; visibility: hidden; transition: .3s;
}
.mobile-mask.show { opacity: 1; visibility: visible; }

/* --- 17. 响应式 ------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual { max-width: 560px; margin: 0 auto; }
  .eth-grid, .adv-grid, .stat-band, .work-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 8px 0; }
  .flow-step::after { display: none; }
  .cta-band { grid-template-columns: 1fr; padding: 48px 36px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 780px) {
  :root { --nav-h: 64px; }
  .section { padding: 72px 0; }
  .menu {
    position: fixed; inset: var(--nav-h) 0 auto 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 2px; padding: 16px 20px 26px;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--sh-md);
    transform: translateY(-130%); transition: transform .4s cubic-bezier(.2,.7,.3,1);
  }
  .menu.show { transform: none; }
  .menu a { padding: 13px 12px; font-size: 16px; }
  .nav-cta { display: none; }
  .burger { display: block; }
  .burger.act span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .burger.act span:nth-child(2) { opacity: 0; }
  .burger.act span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .biz-grid, .eth-grid, .adv-grid, .work-grid, .stat-band, .field-row, .split, .split.even { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .biz-card { padding: 34px 26px; }
  .form-card { padding: 28px 22px; }
  .hero { padding-top: calc(var(--nav-h) + 56px); }
  .hero-stats { gap: 24px; }
  .hero-stats div b { font-size: 26px; }
  .hero-float.f1 { left: -8px; } .hero-float.f2 { right: -8px; }
  .cta-band { padding: 38px 26px; }
  .footer-top { grid-template-columns: 1fr; }
  .scroll-hint { display: none; }
}