/* =========================================================
   楼少侠官网 · 品牌样式
   视觉关键词：纸张底色 / 墨黑大字 / 荧光绿点缀 / 编辑排版
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  --paper: #f2efe6;        /* 主背景：纸张米白 */
  --paper-2: #e9e5d7;      /* 次级背景：略深纸张 */
  --paper-3: #ded9c8;
  --ink: #14150f;          /* 主文字：墨黑 */
  --ink-soft: #24251c;
  --lime: #b9f34c;         /* 品牌强调：荧光绿 */
  --lime-deep: #a5e02f;
  --muted: #6f7264;        /* 次要文字 */
  --line: rgba(20, 21, 15, .14);
  --line-strong: rgba(20, 21, 15, .28);

  /* 字体栈 */
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;

  --wrap: 1240px;                              /* 内容最大宽度 */
  --pad: clamp(20px, 4vw, 64px);               /* 页面左右安全边距 */
  --ease: cubic-bezier(.2, .8, .25, 1);        /* 统一缓动曲线 */
  --header-h: 72px;
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 纸张轻微纹理：用两层极淡的径向渐变模拟，不依赖外部图片 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    radial-gradient(rgba(20, 21, 15, .035) 1px, transparent 1px),
    radial-gradient(rgba(20, 21, 15, .025) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 2px 3px;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3, p, dl, dd, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
::selection { background: var(--lime); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--lime-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 跳转链接：键盘用户可见 */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--lime);
  border-radius: 8px;
  transform: translateY(-160%);
  transition: transform .25s var(--ease);
}
.skip-link:focus { transform: none; }

main { position: relative; z-index: 1; }

/* ---------- 3. 通用排版 ---------- */
.sec-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
  text-transform: uppercase;
}
.sec-label::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--lime-deep);
  border: 1px solid var(--ink);
  flex: none;
}

.section-title {
  margin-top: 18px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.1rem, 4.2vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink);
}

/* 标题里的荧光绿高亮：像用记号笔划了一道 */
.section-title em,
.hero-title em {
  position: relative;
  display: inline-block;
  z-index: 0;
  font-style: normal;
  white-space: nowrap;
}
.section-title em::after,
.hero-title em::after {
  content: "";
  position: absolute;
  left: -.06em;
  right: -.06em;
  bottom: .08em;
  height: .34em;
  background: var(--lime);
  transform: rotate(-1deg);
  z-index: -1;
}

.section-lead {
  margin-top: 20px;
  max-width: 34em;
  color: var(--muted);
  font-size: .98rem;
  line-height: 1.95;
}

.section {
  position: relative;
  padding: clamp(72px, 9vw, 120px) var(--pad);
}
.section-inner {
  max-width: var(--wrap);
  margin: 0 auto;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(24px, 5vw, 72px);
  margin-bottom: clamp(34px, 5vw, 58px);
}
.section-remark {
  max-width: 320px;
  padding-bottom: 6px;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.9;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: .93rem;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              background-color .25s var(--ease), color .25s var(--ease);
}
.btn svg { width: 18px; height: 18px; flex: none; }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--lime);
}
.btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--lime);
}

.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.btn-lime {
  background: var(--lime);
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}
.btn-lime:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--ink);
}

.btn-outline-light {
  border-color: rgba(242, 239, 230, .5);
  color: var(--paper);
}
.btn-outline-light:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(242, 239, 230, .82);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px -24px rgba(20, 21, 15, .6);
}

.nav-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: var(--wrap);
  height: var(--header-h);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}
.brand-mark {
  /* 站点图标：直接用吉祥物猫头，去掉原来「楼」字的底色方块 */
  display: block;
  width: 34px;
  height: 34px;
  border-radius: 9px;
}
.brand-name {
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 600;
  letter-spacing: .06em;
}
.brand-sub {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .22em;
  color: var(--muted);
  padding-left: 2px;
  border-left: 1px solid var(--line-strong);
  line-height: 1.1;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  margin-left: auto;
}
.nav-links a {
  position: relative;
  font-size: .9rem;
  color: var(--ink-soft);
  padding: 6px 0;
  transition: color .2s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--lime-deep);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  flex: none;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--lime);
  font-size: .85rem;
  font-weight: 600;
  transition: background-color .2s var(--ease), transform .2s var(--ease);
}
.nav-cta:hover { background: var(--lime-deep); transform: translateY(-1px); }

/* 移动端汉堡按钮 */
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  border: 1px solid var(--ink);
  border-radius: 10px;
  background: transparent;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }

/* ---------- 6. 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 7vw, 96px) var(--pad) clamp(64px, 8vw, 108px);
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }

/* 网格背景：向四周淡出 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(20, 21, 15, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 21, 15, .07) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 80% 70% at 55% 40%, #000 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 55% 40%, #000 20%, transparent 80%);
}

/* 荧光绿光晕 */
.hero-glow {
  position: absolute;
  top: -18%;
  right: -6%;
  width: 46vw;
  max-width: 620px;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(185, 243, 76, .55), rgba(185, 243, 76, 0) 66%);
  filter: blur(10px);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.04fr .96fr;
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
  max-width: var(--wrap);
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--ink-soft);
  background: rgba(242, 239, 230, .6);
}
.dot-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime-deep);
  box-shadow: 0 0 0 0 rgba(165, 224, 47, .7);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(165, 224, 47, .6); }
  70% { box-shadow: 0 0 0 9px rgba(165, 224, 47, 0); }
  100% { box-shadow: 0 0 0 0 rgba(165, 224, 47, 0); }
}

.hero-title {
  margin-top: 22px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.9rem, 6.4vw, 5.9rem);
  line-height: 1.02;
  letter-spacing: -.035em;
}
.hero-title .line { display: block; }

.hero-lead {
  margin-top: 26px;
  max-width: 31em;
  color: var(--muted);
  font-size: clamp(.95rem, 1.1vw, 1.04rem);
  line-height: 1.95;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-note {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* 首屏四项统计 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.hero-stats > div { padding-left: 14px; border-left: 1px solid var(--line); }
.hero-stats > div:first-child { padding-left: 0; border-left: 0; }
.hero-stats dt {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--muted);
}
.hero-stats dd {
  margin-top: 4px;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1;
  font-weight: 600;
}
.hero-stats dd span {
  margin-left: 2px;
  font-family: var(--sans);
  font-size: .62em;
  font-weight: 500;
  color: var(--muted);
}

/* ---------- 7. 手机模型 ---------- */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px 0;
}
.phone-glow {
  position: absolute;
  width: 66%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(185, 243, 76, .7), rgba(185, 243, 76, 0) 68%);
  filter: blur(30px);
  z-index: 0;
}

.phone {
  position: relative;
  z-index: 1;
  width: clamp(232px, 23vw, 292px);
}
.phone-bezel {
  position: relative;
  padding: 9px;
  background: #0c0d09;
  border-radius: 44px;
  box-shadow:
    0 2px 0 rgba(255, 255, 255, .14) inset,
    0 30px 60px -28px rgba(20, 21, 15, .55),
    0 0 0 1px rgba(20, 21, 15, .9);
}
.phone-bezel img {
  width: 100%;
  border-radius: 36px;
  background: #fff;
}
.phone-island {
  position: absolute;
  top: 17px;
  left: 50%;
  transform: translateX(-50%);
  width: 30%;
  height: 18px;
  border-radius: 999px;
  background: #0c0d09;
  z-index: 2;
}

.phone-hero { transform: rotate(1.6deg); }

/* 悬浮小卡片 */
.float-card {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 12px;
  box-shadow: 4px 4px 0 var(--ink);
}
.float-card b { display: block; font-size: .82rem; line-height: 1.2; }
.float-card small { display: block; font-size: .68rem; color: var(--muted); line-height: 1.4; }

/* 首屏小程序码：沿用浮卡的白底、黑描边、实心投影，保留同样的浮动动画 */
.float-qr {
  top: 3%;
  left: -13%;
  flex-direction: column;
  gap: 8px;
  padding: 10px 10px 9px;
  background: #fff;      /* 纯白底充当二维码的「安静区」，保证可扫 */
  animation: floaty 5.5s ease-in-out infinite;
}
.float-qr img { display: block; width: 132px; height: 132px; border-radius: 6px; }
.fq-caption {
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .08em;
  color: var(--ink);
  white-space: nowrap;
}
/* 价格卡放在左下，与右下角旋转徽章错开，避免叠在一起 */
.float-price { bottom: 9%; left: -8%; animation: floaty 6.5s ease-in-out .8s infinite; }
.float-price b { font-family: var(--serif); font-size: 1.3rem; line-height: 1.1; }
.float-price b span { font-family: var(--sans); font-size: .6rem; color: var(--muted); margin-left: 2px; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* 旋转圆形徽章 */
.hero-stamp {
  position: absolute;
  right: 1%;
  bottom: 6%;
  z-index: 3;
  display: grid;
  place-items: center;
  width: clamp(84px, 9vw, 112px);
  aspect-ratio: 1;
  background: var(--lime);
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  box-shadow: 4px 4px 0 var(--ink);
  transform: rotate(-11deg);
}
.hero-stamp svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  animation: spin 24s linear infinite;
}
.hero-stamp text {
  font-family: var(--mono);
  font-size: 9.4px;
  letter-spacing: 2.1px;
  fill: var(--ink);
}
.hero-stamp > span {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: .08em;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 8. 滚动标语 ---------- */
/* 裁切层：上下留出余量容纳旋转后的斜角，横向剪掉溢出视口的部分 */
.marquee-wrap {
  overflow: hidden;
  padding: 26px 0;
}
.marquee {
  position: relative;
  z-index: 1;
  overflow: hidden;
  width: 104%;
  margin-left: -2%;
  padding: 16px 0;
  background: var(--ink);
  color: var(--paper);
  transform: rotate(-1.4deg);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.marquee-track {
  display: flex;
  align-items: center;
  gap: 30px;
  width: max-content;
  animation: marquee 40s linear infinite;
}
.marquee-track span {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 1.8vw, 1.5rem);
  letter-spacing: .04em;
  white-space: nowrap;
}
.marquee-track i { color: var(--lime); font-style: normal; font-size: 1rem; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 9. 为什么 ---------- */
.why-grid {
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  gap: clamp(36px, 6vw, 88px);
  align-items: start;
}
.why-head .section-title { margin-top: 16px; }

.why-list { padding-top: 6px; }
.why-row {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}
.why-row:last-of-type { border-bottom: 1px solid var(--line); }
.why-row:hover { background: rgba(185, 243, 76, .24); padding-left: 12px; }
.why-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}
.why-body h3 {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: .01em;
}
.why-body p {
  margin-top: 5px;
  color: var(--muted);
  font-size: .89rem;
  line-height: 1.75;
}
.why-tag {
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--ink-soft);
  white-space: nowrap;
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}
.why-row:hover .why-tag { background: var(--lime); border-color: var(--ink); }

.why-summary {
  margin-top: 26px;
  padding-left: 18px;
  border-left: 3px solid var(--lime-deep);
  font-size: .96rem;
  line-height: 1.85;
}
.why-summary b { font-weight: 600; }

/* ---------- 10. 服务 ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.service-card {
  display: flex;
  flex-direction: column;
  padding: 26px 22px 28px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease),
              border-color .35s var(--ease), background-color .35s var(--ease);
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--ink);
  background: #f7f4ec;
  box-shadow: 7px 7px 0 var(--ink);
}
.sc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 26px;
}
.sc-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}
.sc-icon {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  background: var(--lime);
  border: 1px solid var(--ink);
  border-radius: 12px;
  color: var(--ink);
}
.sc-icon svg { width: 27px; height: 27px; }
.service-card h3 {
  font-family: var(--serif);
  font-size: 1.28rem;
  font-weight: 600;
}
.service-card p {
  margin-top: 9px;
  color: var(--muted);
  font-size: .87rem;
  line-height: 1.8;
}

/* ---------- 11. 怎么用 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(18px, 2.6vw, 34px);
}
.step {
  position: relative;
  padding-top: 28px;
  border-top: 1.5px solid var(--ink);
}
.step::before {
  content: "";
  position: absolute;
  top: -5.5px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  border: 1.5px solid var(--ink);
}
.step-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}
.step h3 {
  margin-top: 10px;
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.4;
}
.step p {
  margin-top: 8px;
  color: var(--muted);
  font-size: .87rem;
  line-height: 1.8;
}
.step-chip {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .08em;
  color: var(--ink-soft);
}

.how-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: clamp(40px, 5vw, 64px);
  padding: 24px 28px;
  background: var(--lime);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}
.hb-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: rgba(20, 21, 15, .62);
}
.how-banner p {
  margin-top: 4px;
  font-size: .98rem;
}
.how-banner p b { font-family: var(--serif); font-size: 1.12rem; }
.how-banner .btn { background: var(--ink); color: var(--lime); border-color: var(--ink); }
.how-banner .btn:hover { transform: translateY(-2px); }

/* ---------- 12. 产品三端 ---------- */
.product { background: var(--paper-2); }

.tabs { margin-top: 8px; }

.tab-list {
  position: relative;
  display: inline-flex;
  gap: 2px;
  padding: 5px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 999px;
}
.tab-btn {
  position: relative;
  z-index: 1;
  padding: 10px 20px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-size: .89rem;
  font-weight: 500;
  color: var(--muted);
  transition: color .25s var(--ease);
  white-space: nowrap;
}
.tab-btn.is-active { color: var(--ink); font-weight: 600; }
.tab-thumb {
  position: absolute;
  top: 5px;
  left: 0;
  z-index: 0;
  height: calc(100% - 10px);
  width: 0;
  background: var(--lime);
  border-radius: 999px;
  transition: transform .38s var(--ease), width .38s var(--ease);
}

.tab-panel {
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  align-items: center;
  gap: clamp(32px, 5vw, 68px);
  padding-top: clamp(32px, 4vw, 52px);
}
.tab-panel[hidden] { display: none; }

.panel-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--muted);
}
.panel-label::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--lime-deep);
  border: 1px solid var(--ink);
}
.panel-copy h3 {
  margin: 14px 0 22px;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.3vw, 2rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -.01em;
}
.feature-list li {
  position: relative;
  padding: 11px 0 11px 24px;
  border-top: 1px dashed var(--line-strong);
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.75;
}
.feature-list li:last-child { border-bottom: 1px dashed var(--line-strong); }
.feature-list li::before {
  content: "";
  position: absolute;
  top: 19px;
  left: 4px;
  width: 7px;
  height: 7px;
  background: var(--lime-deep);
  transform: rotate(45deg);
}
.feature-list b {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
  font-size: .95rem;
  font-weight: 600;
}

/* 产品截图区 */
.panel-shots { display: flex; justify-content: center; }
.phone-pair { gap: clamp(12px, 2vw, 22px); align-items: flex-start; }
.phone-sm { width: clamp(150px, 15vw, 204px); }
.phone-sm .phone-bezel { padding: 7px; border-radius: 32px; }
.phone-sm .phone-bezel img { border-radius: 26px; }
.phone-sm .phone-island { top: 13px; height: 13px; }
.phone-offset { margin-top: 40px; }

.panel-shots figcaption {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--muted);
  text-align: center;
}

.leader-shot {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 26px);
}
.leader-board {
  flex: 1;
  min-width: 0;
  padding: 20px 22px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 14px;
  box-shadow: 5px 5px 0 var(--ink);
}
.lb-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--muted);
}
.lb-row {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 13px 0;
  border-top: 1px dashed var(--line-strong);
}
.lb-row b { font-family: var(--serif); font-size: 1rem; }
.lb-row span { font-size: .8rem; color: var(--muted); }
.lb-row i {
  font-family: var(--mono);
  font-size: 9.5px;
  font-style: normal;
  color: var(--muted);
}

.admin-shots {
  display: grid;
  gap: 16px;
  width: 100%;
  justify-items: stretch;
}
.browser-shot {
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 12px;
  box-shadow: 0 26px 60px -34px rgba(20, 21, 15, .75);
}
.browser-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 9px 12px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line-strong);
}
.browser-bar i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--paper);
}
.browser-bar i:first-child { background: var(--lime); border-color: var(--ink); }
.browser-bar span {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .06em;
  color: var(--muted);
}
.browser-shot img { width: 100%; }
.browser-shot figcaption {
  padding: 9px 14px 11px;
  margin: 0;
  text-align: left;
  border-top: 1px solid var(--line);
}
.browser-small { width: 84%; justify-self: end; }

.shot-note {
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 13. 安全保障 ---------- */
.safety {
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}
.safety-inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
}
.sec-label.light { color: rgba(242, 239, 230, .55); }
.sec-label.light::before { border-color: var(--paper); }
.section-title.light { color: var(--paper); }
/* 深色区的高亮词保持米白字，仅靠底部荧光绿记号条做强调，避免深底深字看不清 */
.section-title.light em { color: var(--paper); }
.section-lead.light { color: rgba(242, 239, 230, .62); }

.safety-head { max-width: 640px; }

.safety-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: clamp(36px, 5vw, 60px);
}
.safety-card {
  padding: 24px 22px 26px;
  background: var(--ink-soft);
  border: 1px solid rgba(242, 239, 230, .16);
  border-radius: 14px;
  transition: border-color .3s var(--ease), transform .3s var(--ease),
              background-color .3s var(--ease);
}
.safety-card:hover {
  transform: translateY(-5px);
  border-color: var(--lime);
  background: #2b2d22;
}
.safety-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--lime);
}
.safety-card h3 {
  margin-top: 12px;
  font-family: var(--serif);
  font-size: 1.16rem;
  font-weight: 600;
  color: var(--paper);
}
.safety-card p {
  margin-top: 8px;
  color: rgba(242, 239, 230, .6);
  font-size: .85rem;
  line-height: 1.8;
}

/* 圆形印章 */
/* 印章改为普通流式布局，靠右下角排布，不再压住第 4 张卡片文字 */
.safety-seal {
  position: static;
  margin: 34px 6px 0 auto;
  display: grid;
  place-items: center;
  width: 132px;
  aspect-ratio: 1;
  color: var(--lime);
  transform: rotate(9deg);
}
.safety-seal svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  animation: spin 30s linear infinite reverse;
}
.safety-seal text {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2.6px;
  fill: rgba(185, 243, 76, .8);
}
.safety-seal > span {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1;
  text-align: center;
  color: var(--lime);
}
.safety-seal small { font-family: var(--sans); font-size: .5rem; letter-spacing: .1em; }

/* ---------- 14. 价格与时段 ---------- */
.price-layout {
  display: grid;
  grid-template-columns: 1.32fr .68fr;
  gap: clamp(18px, 2.4vw, 28px);
  align-items: stretch;
}
/* 五档规格（小件 / 中件 / 大件 / 超大件 / 巨大）并排展示，窄屏时按断点折行 */
.price-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px 16px 20px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease),
              border-color .3s var(--ease);
}
.price-card:hover {
  transform: translateY(-4px);
  border-color: var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}
.price-card.is-featured {
  background: var(--lime);
  border-color: var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
  transform: translateY(-6px);
}
.pc-badge {
  position: absolute;
  top: -12px;
  right: 16px;
  padding: 4px 10px;
  background: var(--ink);
  color: var(--lime);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .1em;
}
.pc-name {
  font-family: var(--serif);
  font-size: 1.24rem;
  font-weight: 600;
}
.pc-desc {
  margin-top: 6px;
  min-height: 2.8em;
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.6;
}
.pc-price {
  margin-top: 18px;
  font-family: var(--serif);
  font-size: 2.3rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
}
.pc-price > span { font-size: .42em; vertical-align: .55em; margin-right: 2px; }
.pc-price i {
  margin-left: 6px;
  font-family: var(--sans);
  font-size: .3em;
  font-style: normal;
  font-weight: 500;
  color: var(--muted);
}
.pc-was {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: rgba(20, 21, 15, .55);
  text-decoration: line-through;
}
/* 荧光绿卡片上把次要文字加深，保证在亮底上的可读性 */
.price-card.is-featured .pc-desc,
.price-card.is-featured .pc-was,
.price-card.is-featured .pc-price i { color: rgba(20, 21, 15, .7); }

.slot-card {
  display: flex;
  flex-direction: column;
  padding: 28px 26px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 18px;
}
.slot-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--lime);
}
.slot-card h3 {
  margin-top: 8px;
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
}
.slot-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px dashed rgba(242, 239, 230, .22);
}
.slot-card h3 + .slot-row { margin-top: 16px; }
.slot-time {
  font-family: var(--serif);
  font-size: 1.42rem;
  color: var(--lime);
  letter-spacing: .01em;
}
.slot-name { font-size: .76rem; color: rgba(242, 239, 230, .55); }
.slot-note {
  margin-top: 14px;
  color: rgba(242, 239, 230, .6);
  font-size: .78rem;
  line-height: 1.8;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 18px;
  color: var(--lime);
  font-size: .84rem;
  font-weight: 600;
}
.text-link span { transition: transform .25s var(--ease); }
.text-link:hover span { transform: translateX(4px); }

.price-note {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-strong);
  font-size: .78rem;
  color: var(--muted);
}

/* ---------- 15. 校区覆盖 ---------- */
/* 用略深的纸张色与相邻区块区分，形成「价格（米白）→ 校区（深米白）→ 合作（墨黑）」的节奏 */
.campus { background: var(--paper-2); }

/* 服务速览：四格贴在一起，用 1px 线条分隔，像一个整体数据条 */
.campus-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-bottom: clamp(30px, 4vw, 48px);
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  overflow: hidden;
}
.campus-facts > div {
  padding: 18px 20px;
  background: var(--paper-2);
}
.campus-facts dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--muted);
}
.campus-facts dd {
  margin-top: 8px;
  font-size: .95rem;
  line-height: 1.6;
}
.campus-facts dd b {
  font-family: var(--serif);
  font-size: 1.05rem;
}

/* 校区分组卡片：三列，悬停时整卡向左上浮起并压上硬边阴影 */
.campus-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.campus-card {
  display: flex;
  flex-direction: column;
  padding: 24px 24px 26px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease),
              border-color .3s var(--ease);
}
.campus-card:hover {
  transform: translate(-5px, -5px);
  border-color: var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}
.cc-tag {
  align-self: flex-start;
  padding: 4px 10px;
  background: var(--lime);
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .1em;
}
.campus-card h3 {
  margin-top: 14px;
  font-family: var(--serif);
  font-size: 1.16rem;
  font-weight: 600;
  line-height: 1.35;
}
/* 第二行小字放「校区 · 简称」，方便家长和新生对上号 */
.campus-card h3 small {
  display: block;
  margin-top: 4px;
  font-family: var(--sans);
  font-size: .82rem;
  font-weight: 400;
  color: var(--muted);
}
.campus-card p {
  margin-top: 12px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.85;
}
.cc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 18px;
}
.cc-meta span {
  padding: 4px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: .74rem;
  color: var(--ink-soft);
}
.campus-note {
  margin-top: 26px;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.9;
}
/* 校区卡片里的文字链不加额外上边距，跟正文连排 */
.campus-note .text-link { margin-top: 0; padding-top: 0; color: var(--ink); text-decoration: underline; }
/* 校区提示里的邮箱链接：跟随正文墨色，避免浏览器默认蓝色 */
.campus-note a { color: var(--ink); text-decoration: underline; }

/* ---------- 16. 校园合作 ---------- */
.partner {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 9vw, 120px) var(--pad);
  background: var(--ink);
  color: var(--paper);
}
.partner-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: clamp(36px, 6vw, 80px);
  max-width: var(--wrap);
  margin: 0 auto;
  align-items: center;
}
/* 文字内容压在「少侠」水印之上，避免描边线条穿过标题 */
.partner-copy,
.partner-steps { position: relative; z-index: 1; }
.partner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.partner-note {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .05em;
  color: rgba(242, 239, 230, .45);
}
.partner-steps li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid rgba(242, 239, 230, .18);
}
.partner-steps li:last-child { border-bottom: 1px solid rgba(242, 239, 230, .18); }
.partner-steps span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--lime);
  padding-top: 3px;
}
.partner-steps h3 {
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 600;
  color: var(--paper);
}
.partner-steps p {
  margin-top: 4px;
  color: rgba(242, 239, 230, .58);
  font-size: .85rem;
  line-height: 1.75;
}
.partner-word {
  position: absolute;
  right: -2%;
  bottom: -14%;
  z-index: 0;
  font-family: var(--serif);
  font-size: clamp(140px, 20vw, 260px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(242, 239, 230, .13);
  pointer-events: none;
  user-select: none;
}

/* ---------- 17. 常见问题 ---------- */
.faq-grid {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(36px, 6vw, 80px);
  align-items: start;
}
.faq-head { position: sticky; top: calc(var(--header-h) + 32px); }

.faq-list { border-top: 1px solid var(--line-strong); }
.faq-item { border-bottom: 1px solid var(--line); }

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  transition: color .2s var(--ease);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--ink); }

/* 加号图标：展开时竖线收起变成减号 */
.faq-item summary i {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transition: background-color .25s var(--ease), border-color .25s var(--ease),
              transform .3s var(--ease);
}
.faq-item summary i::before,
.faq-item summary i::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--ink);
  transform: translate(-50%, -50%);
}
.faq-item summary i::before { width: 10px; height: 1.5px; }
.faq-item summary i::after { width: 1.5px; height: 10px; transition: opacity .2s var(--ease); }
.faq-item[open] summary i { background: var(--lime); border-color: var(--ink); }
.faq-item[open] summary i::after { opacity: 0; }

.faq-a {
  padding: 0 40px 24px 0;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.95;
}

/* ---------- 18. 行动区 ---------- */
.download {
  padding: clamp(72px, 9vw, 120px) var(--pad);
  background: var(--lime);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.download-inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: clamp(36px, 6vw, 72px);
  align-items: center;
  max-width: var(--wrap);
  margin: 0 auto;
}

/* 荧光绿底上的浅色文字需要改为墨色 */
.download .sec-label.light { color: rgba(20, 21, 15, .6); }
.download .sec-label.light::before { border-color: var(--ink); }
.download h2 {
  margin-top: 18px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 5vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: -.025em;
}
.download h2 em { color: var(--paper); }
.download h2 em::after { background: var(--ink); }
.download .section-lead.light { color: rgba(20, 21, 15, .72); max-width: 28em; }

.download-card {
  padding: 28px 30px 30px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 18px;
  box-shadow: 10px 10px 0 rgba(20, 21, 15, .28);
}
.dc-step {
  display: block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .18em;
  color: var(--lime);
}
.dc-step:first-child { margin-top: 0; }
.download-card h3 {
  margin-top: 4px;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
}
.download-card p {
  margin-top: 2px;
  color: rgba(242, 239, 230, .58);
  font-size: .84rem;
  line-height: 1.7;
}

/* ---------- 19. 页脚 ---------- */
.site-footer {
  padding: clamp(48px, 6vw, 72px) var(--pad) 26px;
  background: var(--ink);
  color: var(--paper);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: clamp(28px, 4vw, 48px);
  max-width: var(--wrap);
  margin: 0 auto;
}
.footer-brand .brand-name { color: var(--paper); }
.footer-slogan {
  margin-top: 16px;
  font-family: var(--serif);
  font-size: 1.12rem;
  letter-spacing: .02em;
}
.footer-desc {
  margin-top: 8px;
  max-width: 24em;
  color: rgba(242, 239, 230, .5);
  font-size: .82rem;
  line-height: 1.8;
}
.footer-col h3 {
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .16em;
  color: rgba(242, 239, 230, .42);
  text-transform: uppercase;
}
.footer-col a,
.footer-col span {
  display: block;
  margin-bottom: 9px;
  color: rgba(242, 239, 230, .72);
  font-size: .85rem;
  line-height: 1.7;
  transition: color .2s var(--ease);
}
.footer-col a:hover { color: var(--lime); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  max-width: var(--wrap);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(242, 239, 230, .14);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: rgba(242, 239, 230, .42);
}

/* 网络安全合规信息：备案号按《网络安全法》要求展示在页脚底部 */
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: var(--wrap);
  margin: 10px auto 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .04em;
  line-height: 1.7;
  color: rgba(242, 239, 230, .34);
}
.footer-legal a {
  color: inherit;
  text-decoration: none;
  transition: color .2s var(--ease);
}
.footer-legal a:hover { color: var(--lime); }
.legal-sep { opacity: .45; }

/* ---------- 20. 滚动入场动画 ---------- */
/* 默认可见；仅在 JS 正常运行时才隐藏，避免脚本失败导致内容不可见 */
html.js .reveal,
html.js .rise {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .75s var(--ease), transform .75s var(--ease);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
html.js .reveal.is-in,
html.js .rise.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 21. 响应式 ---------- */
/* 价格区五档卡片需要足够宽度：1280 以下让卡片整行铺开，避免被挤成细条 */
@media (max-width: 1280px) {
  .price-layout { grid-template-columns: 1fr; }
  .slot-card h3 + .slot-row { margin-top: 10px; }
}

@media (max-width: 1080px) {
  .why-grid { grid-template-columns: 1fr; gap: 36px; }
  .why-head { max-width: 600px; }

  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 34px; }

  .tab-panel { grid-template-columns: 1fr; gap: 44px; }
  .panel-copy { max-width: 620px; }
  .phone-pair { justify-content: flex-start; }
  .leader-shot { justify-content: flex-start; }
  .leader-board { max-width: 420px; }

  .faq-grid { grid-template-columns: 1fr; gap: 32px; }
  .faq-head { position: static; max-width: 560px; }

  /* 校区卡片从三列折成两列，服务速览也从四格折成两格 */
  .campus-list { grid-template-columns: repeat(2, 1fr); }
  .campus-facts { grid-template-columns: repeat(2, 1fr); }

  .partner-inner { grid-template-columns: 1fr; gap: 40px; }
  .partner-copy { max-width: 620px; }

  .download-inner { grid-template-columns: 1fr; }
  .download-card { max-width: 480px; }

  .footer-inner { grid-template-columns: 1fr 1fr; row-gap: 36px; }
}

/* 首屏收窄到 920px 以下才折成单列，让 1000px 左右仍能同时看到文案与手机产品图 */
@media (max-width: 920px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-copy { max-width: 640px; }
  .hero-visual { justify-content: flex-start; padding-left: 26px; }
  .float-qr { left: -2%; }
  /* 单列时徽章挪到图右上、价格卡留在右下，避免两个浮层抢同一个角 */
  .hero-stamp { top: 2%; right: 2%; bottom: auto; }
  .float-price { left: auto; right: 6%; bottom: 10%; }
}

@media (max-width: 860px) {
  .brand-sub { display: none; }

  /* 移动端导航变成下拉面板 */
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 90;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 8px var(--pad) 22px;
    background: var(--paper);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: 0 24px 40px -30px rgba(20, 21, 15, .8);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform .38s var(--ease), opacity .3s var(--ease);
  }
  .nav-links.is-open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    padding: 14px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--line);
  }
  .nav-links a::after { display: none; }

  .nav-cta { display: none; }
  .menu-toggle { display: block; }

  .safety-seal { position: static; margin: 40px 0 0 auto; }
  .safety-grid { grid-template-columns: repeat(2, 1fr); }

  .price-cards { grid-template-columns: 1fr; }
  .price-card.is-featured { transform: none; }
  .pc-desc { min-height: 0; }
  .slot-card { margin-top: 6px; }
}

@media (max-width: 620px) {
  :root { --header-h: 64px; }

  body::before { opacity: .35; }

  .hero { padding-top: 48px; }
  .hero-title { font-size: clamp(2.5rem, 10vw, 3.4rem); }
  .hero-actions .btn { flex: 1 1 auto; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 18px; }
  .hero-stats > div:nth-child(3) { padding-left: 0; border-left: 0; }
  .hero-visual { padding-left: 0; justify-content: center; }
  .phone { width: min(72vw, 280px); }
  .float-card { display: none; }
  .hero-stamp { right: -2%; bottom: 0; }

  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .section-remark { padding-bottom: 0; }
  .why-row { grid-template-columns: 36px 1fr; row-gap: 8px; }
  .why-tag { grid-column: 2; justify-self: start; }
  .why-row:hover { padding-left: 0; }

  .service-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; row-gap: 26px; }

  /* 手机上校区卡片与速览都改为单列，保证每行文字不挤 */
  .campus-list { grid-template-columns: 1fr; }
  .campus-facts { grid-template-columns: 1fr; }

  .how-banner { flex-direction: column; align-items: flex-start; padding: 22px; }
  .how-banner .btn { width: 100%; }

  .tab-list { width: 100%; display: flex; }
  .tab-btn { flex: 1; padding: 10px 8px; font-size: .82rem; }

  .phone-pair { flex-wrap: wrap; justify-content: center; gap: 18px; }
  .phone-sm { width: 42%; }
  .phone-offset { margin-top: 26px; }

  .leader-shot { flex-direction: column; align-items: stretch; }
  .leader-board { max-width: none; }
  .leader-shot .phone-sm { width: 62%; align-self: center; }

  .browser-small { width: 100%; justify-self: stretch; margin-top: 0; }

  .safety-grid { grid-template-columns: 1fr; }
  .safety-seal { width: 116px; margin-top: 32px; margin-right: auto; margin-left: 0; }

  .partner-actions .btn { width: 100%; }
  .partner-word { font-size: 130px; bottom: -6%; }

  .faq-a { padding-right: 8px; }
  .faq-item summary { font-size: .95rem; }

  .download-card { padding: 24px 22px 26px; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  /* 手机上合规信息竖排，避免长句挤在一行溢出 */
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 4px; }
  .legal-sep { display: none; }
}

/* ---------- 22. 无障碍：减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js .reveal,
  html.js .rise {
    opacity: 1;
    transform: none;
  }
  .marquee-track { animation: none; }
}