/* ==========================================================================
   赏帮赚新手指南 - 样式表
   纯手写 CSS，无框架依赖；大屏 / 平板 / 手机自适应
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --ink: #241b18;          /* 主文字色（深棕） */
  --muted: #6f625d;        /* 次要文字色 */
  --paper: #fffaf4;        /* 页面底色（暖白） */
  --surface: #fff;         /* 卡片底色 */
  --soft: #f8efe6;         /* 浅强调底色 */
  --line: #422b2321;       /* 分隔线 */
  --coral: #f14a37;        /* 主色（珊瑚红） */
  --coral-dark: #c92f21;   /* 主色加深（悬停） */
  --amber: #f7a928;        /* 琥珀黄点缀 */
  --blue: #2674d9;         /* 蓝色点缀 */
  --green: #238a63;        /* 绿色（通过/安全） */
}

/* ---------- 基础重置 ---------- */
* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px; /* 锚点定位时避开吸顶导航 */
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.5;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; font-weight: 400; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; border: 0; background: none; cursor: pointer; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid #246fd4;
  outline-offset: 3px;
}

::selection { background: #f14a3733; }

/* 跳转正文链接（无障碍，仅聚焦时可见） */
.skip-link {
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 1000;
  color: #fff;
  background: var(--ink);
  border-radius: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 76px;
  padding: 0 max(24px, 50vw - 600px);
  background: #fffaf4ed;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand-mark {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px #da332433;
}
.brand-mark img { width: 100%; height: 100%; object-fit: contain; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.1; }
.brand-copy strong { font-size: 16px; letter-spacing: -0.02em; }
.brand-copy small { color: var(--muted); font-size: 10px; letter-spacing: 0.08em; margin-top: 5px; }

.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav a {
  color: #5f524d;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 12px;
  border-radius: 9px;
}
.site-nav a:hover,
.site-nav a.is-active { color: var(--coral-dark); background: #f14a3714; }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #fff;
  background: var(--coral);
  font-size: 14px;
  font-weight: 800;
  padding: 11px 16px;
  border-radius: 12px;
  box-shadow: 0 8px 24px #da332433;
}
.header-cta:hover { background: var(--coral-dark); }

.menu-button { display: none; margin-left: auto; padding: 8px; color: var(--ink); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  align-items: center;
  gap: 70px;
  max-width: 1200px;
  min-height: 680px;
  margin: 0 auto;
  padding: 86px 24px 82px;
}

/* 背景光晕 */
.hero-glow { position: absolute; z-index: -1; border-radius: 50%; filter: blur(1px); opacity: 0.75; }
.hero-glow-one { width: 560px; height: 560px; top: 10px; left: -280px; background: radial-gradient(circle, #fa6b4a29, #fa6b4a00 68%); }
.hero-glow-two { width: 480px; height: 480px; bottom: -120px; right: -180px; background: radial-gradient(circle, #f9ae2f2e, #f9ae2f00 70%); }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--coral-dark);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.04em;
  margin: 0 0 18px;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(46px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.055em;
}
.hero h1 span { color: var(--coral); }

.hero-lead { max-width: 680px; color: #5f524d; font-size: 19px; line-height: 1.85; margin-top: 28px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 900;
  transition: all 0.2s;
}
.primary-button {
  color: #fff;
  background: var(--coral);
  border: 1px solid var(--coral);
  box-shadow: 0 12px 30px #d2302233;
}
.primary-button:hover { background: var(--coral-dark); transform: translateY(-1px); }
.secondary-button { border: 1px solid var(--line); background: #ffffffb8; }
.secondary-button:hover { color: var(--coral-dark); border-color: #f14a3766; }

.outbound-note {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  max-width: 650px;
  color: #7d6e68;
  font-size: 12px;
  line-height: 1.6;
  margin-top: 16px;
}
.outbound-note svg { flex: none; margin-top: 2px; }

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  color: #544843;
  font-size: 13px;
  font-weight: 700;
  margin-top: 26px;
}
.trust-row span { display: inline-flex; align-items: center; gap: 6px; }
.trust-row svg { color: var(--green); }

/* 邀请码卡片 */
.invite-card {
  position: relative;
  overflow: hidden;
  justify-self: end;
  max-width: 390px;
  padding: 20px;
  text-align: center;
  background: #ffffffe0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid #5630251c;
  border-radius: 30px;
  box-shadow: 0 30px 80px #52301e24;
}
/* 卡片顶部渐变条 */
.invite-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 8px;
  background: linear-gradient(90deg, var(--coral), var(--amber));
}

.invite-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 5px 2px 16px;
  font-size: 12px;
  color: var(--muted);
}
.invite-card-head span { color: var(--ink); font-weight: 900; }
.invite-card-head em { font-style: normal; font-size: 11px; }

.qr-wrap {
  width: min(250px, 72vw);
  margin: 0 auto;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
}
.qr-wrap img { width: 100%; border-radius: 12px; }

.code-label { color: var(--muted); font-size: 12px; margin: 17px 0 4px; }
.invite-code { display: block; color: var(--coral); font-size: 36px; letter-spacing: 0.08em; }

.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 42px;
  margin-top: 10px;
  padding: 0 16px;
  color: var(--coral-dark);
  background: #f14a3712;
  border: 1px solid #f14a3738;
  border-radius: 11px;
  font-weight: 800;
}
.copy-button:hover { background: #f14a371f; }
.copy-button.is-copied { color: var(--green); background: #238a6317; border-color: #238a6340; }

.invite-disclosure { color: var(--muted); font-size: 11px; line-height: 1.6; margin-top: 14px; }

/* ---------- 四条原则横条 ---------- */
.truth-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 1200px;
  margin: 0 auto 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
}
.truth-strip div { position: relative; padding: 24px; }
.truth-strip div + div { border-left: 1px solid var(--line); }
.truth-strip span { color: #f14a3761; font-size: 12px; font-weight: 900; }
.truth-strip strong { display: block; margin-top: 8px; font-size: 16px; }
.truth-strip p { color: var(--muted); font-size: 13px; line-height: 1.6; margin-top: 6px; }

/* ---------- 通用板块 ---------- */
.section-wrap { max-width: 1200px; margin: 0 auto; padding: 100px 24px; }

.section-heading { max-width: 720px; margin-bottom: 42px; }
.section-heading.center { text-align: center; margin-inline: auto; }
.section-heading.center .eyebrow { justify-content: center; }
.section-heading h2 {
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.18;
  letter-spacing: -0.045em;
}
.section-heading > p:last-child { color: var(--muted); line-height: 1.8; margin-top: 18px; }

.answer-section { padding-top: 120px; }

/* ---------- 直接回答区 ---------- */
.answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.direct-answer {
  padding: 38px;
  color: #fff;
  background: linear-gradient(145deg, #30241f, #1e1715);
  border-radius: 26px;
  box-shadow: 0 22px 55px #2e1e1626;
}
.direct-answer > svg { color: #ffb35a; }
.direct-answer h3 { margin: 22px 0 12px; font-size: 24px; }
.direct-answer p { color: #eadfd8; font-size: 17px; line-height: 1.9; }

.boundary-list { display: grid; gap: 12px; }
.boundary-list > div {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
}
.boundary-list svg { flex: none; color: var(--green); }
.boundary-list > div:nth-child(2) svg { color: var(--amber); }
.boundary-list > div:nth-child(3) svg { color: var(--coral); }
.boundary-list p { display: flex; flex-direction: column; gap: 6px; }
.boundary-list strong { font-size: 16px; }
.boundary-list span { color: var(--muted); line-height: 1.65; }

/* ---------- 四步操作路径 ---------- */
.steps-section { background: #fff; max-width: none; }
.steps-section > * { max-width: 1152px; margin-left: auto; margin-right: auto; }

.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.step-card {
  min-height: 250px;
  padding: 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 22px;
}
.step-card > span {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: var(--coral-dark);
  background: #f14a3717;
  border-radius: 13px;
  font-size: 13px;
  font-weight: 900;
}
.step-card h3 { margin: 28px 0 12px; font-size: 20px; }
.step-card p { color: var(--muted); font-size: 14px; line-height: 1.8; }

.section-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 28px; margin-top: 34px; }

.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--coral-dark); font-weight: 900; }
.text-link:hover { color: var(--coral); }

/* ---------- App 界面展示 ---------- */
.app-showcase { background: #fffaf7; }
.app-showcase > * { max-width: 1152px; margin-left: auto; margin-right: auto; }
.app-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.app-preview-card { margin: 0; padding: 14px 14px 22px; background: #fff; border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 18px 45px #462a1c12; }
.app-screen { min-height: 360px; padding: 0; overflow: hidden; color: #332722; background: #f8f1ec; border: 7px solid #2d2421; border-radius: 25px; box-shadow: inset 0 0 0 1px #ffffff70; }
.app-image { display: block; width: 100%; height: 360px; object-fit: contain; background: #f8f1ec; }
.screen-status, .screen-topline, .screen-tabs, .wallet-line { display: flex; align-items: center; justify-content: space-between; }
.screen-status { color: #8b7770; font-size: 9px; font-weight: 900; }
.screen-topline { margin-top: 22px; font-size: 12px; }
.screen-topline strong { font-size: 18px; }
.screen-topline span { color: var(--coral-dark); font-size: 11px; }
.screen-balance { margin-top: 24px; padding: 22px 18px; color: #fff; background: linear-gradient(135deg, #e84431, #fa9b3c); border-radius: 17px; }
.screen-balance small, .wallet-total small { display: block; color: #ffe8dc; font-size: 10px; }
.screen-balance strong, .wallet-total strong { display: block; margin-top: 6px; font-size: 30px; letter-spacing: -0.04em; }
.screen-balance span { display: block; margin-top: 12px; color: #fff5ec; font-size: 10px; }
.screen-tabs { margin: 22px 2px 16px; color: #9f8b84; font-size: 11px; }
.screen-tabs b { color: var(--coral-dark); }
.screen-list { display: grid; gap: 9px; }
.screen-list i { display: block; height: 42px; background: #fff; border: 1px solid #eee0d8; border-radius: 11px; }
.screen-search { margin: 22px 0 14px; padding: 11px 13px; color: #a28e86; background: #fff; border: 1px solid #eee0d8; border-radius: 11px; font-size: 11px; }
.screen-search b { float: right; color: var(--coral-dark); font-size: 15px; }
.task-row { display: grid; grid-template-columns: 1fr auto; gap: 7px; margin-top: 10px; padding: 15px 13px; background: #fff; border: 1px solid #eee0d8; border-radius: 12px; }
.task-row b { font-size: 12px; }
.task-row em { color: var(--coral-dark); font-size: 11px; font-style: normal; font-weight: 900; }
.task-row small { grid-column: 1 / -1; color: #9f8b84; font-size: 10px; }
.task-row.muted { opacity: .58; }
.wallet-total { margin-top: 24px; padding: 22px 18px; color: #fff; background: #302522; border-radius: 17px; }
.wallet-total button { margin-top: 16px; padding: 8px 15px; color: #fff; background: var(--coral); border: 0; border-radius: 99px; font-size: 11px; font-weight: 900; }
.wallet-line { padding: 17px 4px; border-bottom: 1px solid #e9dbd3; font-size: 12px; }
.wallet-line span { color: #967f77; }
.screen-tip { margin-top: 18px; color: #9f8b84; font-size: 10px; line-height: 1.6; }
.app-preview-card figcaption { padding: 18px 4px 0; }
.app-preview-card figcaption span { color: #f14a3761; font-size: 12px; font-weight: 900; }
.app-preview-card figcaption strong { display: block; margin-top: 8px; font-size: 17px; }
.app-preview-card figcaption p { margin-top: 7px; color: var(--muted); font-size: 13px; line-height: 1.65; }

/* ---------- 指南精选卡片 ---------- */
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.guide-card {
  display: block;
  min-height: 360px;
  padding: 32px;
  border: 1px solid transparent;
  border-radius: 26px;
  transition: all 0.2s;
}
.guide-card:hover { transform: translateY(-4px); box-shadow: 0 22px 45px #472f231c; }
.guide-card > svg { width: 34px; height: 34px; }
.guide-card > span { display: block; margin-top: 52px; font-size: 12px; font-weight: 900; letter-spacing: 0.06em; }
.guide-card h3 { margin: 10px 0 12px; font-size: 25px; letter-spacing: -0.025em; }
.guide-card p { color: #655750; line-height: 1.8; }
.guide-card b { display: flex; align-items: center; gap: 8px; margin-top: 28px; font-size: 14px; }

.guide-card.coral { color: #5b211a; background: #ffe8df; border-color: #ffd2c4; }
.guide-card.amber { color: #573813; background: #fff1d2; border-color: #f8dfaa; }
.guide-card.blue { color: #173f72; background: #e8f2ff; border-color: #cfe4fc; }

/* ---------- 信息核验区 ---------- */
.proof-section {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: center;
  gap: 76px;
}
.proof-copy > h2 {
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.18;
  letter-spacing: -0.045em;
}
.proof-copy > p:not(.eyebrow) { color: var(--muted); font-size: 17px; line-height: 1.9; margin: 22px 0 28px; }

.proof-panel {
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 20px 60px #462a1c17;
}
.proof-panel > div { display: flex; align-items: flex-start; gap: 16px; padding: 24px; }
.proof-panel > div + div { border-top: 1px solid var(--line); }

.status-dot { flex: none; width: 13px; height: 13px; margin-top: 5px; border-radius: 50%; box-shadow: 0 0 0 7px #0000000a; }
.status-dot.verified { background: var(--green); }
.status-dot.changing { background: var(--amber); }
.status-dot.excluded { background: var(--coral); }

.proof-panel p { display: flex; flex-direction: column; gap: 7px; }
.proof-panel span:last-child { color: var(--muted); line-height: 1.65; }

/* ---------- 常见问题 ---------- */
.faq-section { padding-top: 70px; }

.faq-list { max-width: 850px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 4px;
  font-size: 17px;
  font-weight: 900;
  cursor: pointer;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary svg { flex: none; transition: transform 0.2s; }
.faq-list details[open] summary svg { transform: rotate(180deg); }
.faq-list summary:hover { color: var(--coral-dark); }
.faq-list details p { max-width: 760px; color: var(--muted); line-height: 1.85; margin: -6px 0 24px; }

/* ---------- 底部行动号召 ---------- */
.final-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  max-width: 1152px;
  margin: 20px auto 100px;
  padding: 48px 54px;
  color: #fff;
  background: linear-gradient(120deg, #e83e2e, #fa7547 60%, #f5a429);
  border-radius: 30px;
  box-shadow: 0 25px 65px #c5342338;
}
.final-cta .eyebrow { color: #ffe4d9; }
.final-cta h2 { font-size: 38px; letter-spacing: -0.03em; }
.final-cta p:last-child { color: #fff1e9; line-height: 1.7; margin-top: 12px; }

.final-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.final-actions .copy-button { margin: 0; color: #fff; background: #ffffff1f; border-color: #ffffff59; }
.final-actions .copy-button:hover { background: #ffffff33; }
.final-actions .copy-button.is-copied { color: #eafff5; background: #238a63aa; border-color: #ffffff88; }

.primary-button.light { color: var(--coral-dark); background: #fff; border-color: #fff; box-shadow: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 70px max(24px, 50vw - 576px) 30px;
  color: #dcd0ca;
  background: #211a18;
}

.footer-grid { display: grid; grid-template-columns: 1.5fr 0.75fr 0.75fr 1fr; gap: 52px; }

.footer-brand .brand-copy strong { color: #fff; }
.footer-brand .brand-copy small { color: #a99b95; }
.footer-brand > p { max-width: 420px; color: #a99b95; font-size: 13px; line-height: 1.9; margin-top: 22px; }

.footer-grid h2 { margin: 0 0 18px; color: #fff; font-size: 14px; }
.footer-grid > div:not(:first-child) { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; font-size: 13px; }
.footer-grid a { color: #bdb0aa; }
.footer-grid a:hover { color: #fff; }
.footer-grid p { color: #a99b95; margin: 0; line-height: 1.75; }
.footer-grid strong { color: #fff; }

.footer-copy { color: #bdb0aa; padding: 0; font-size: 13px; text-decoration: underline; text-underline-offset: 4px; }
.footer-copy:hover { color: #fff; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 55px;
  padding-top: 24px;
  color: #81736e;
  font-size: 12px;
  border-top: 1px solid #ffffff1a;
}

/* ---------- 移动端底部注册栏 ---------- */
.mobile-cta { display: none; }

/* ---------- 联系客服悬浮按钮 ---------- */
.service-widget {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 120;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
}

.service-fab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  color: #fff;
  background: linear-gradient(120deg, var(--coral), #fa7547);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 900;
  box-shadow: 0 14px 34px #d2302244;
  transition: all 0.2s;
}
.service-fab:hover { transform: translateY(-2px); box-shadow: 0 18px 40px #d2302255; }

.service-panel {
  width: 288px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 24px 60px #52301e2e;
  animation: service-pop 0.18s ease-out;
}

@keyframes service-pop {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.service-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.service-head strong { font-size: 16px; }

.service-close {
  display: inline-flex;
  padding: 6px;
  color: var(--muted);
  border-radius: 8px;
}
.service-close:hover { color: var(--ink); background: var(--soft); }

.service-text { color: var(--muted); font-size: 13px; line-height: 1.75; }

.service-qq {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--soft);
  border-radius: 14px;
}
.service-qq-label { width: 100%; color: var(--muted); font-size: 12px; }
.service-qq strong { color: var(--coral-dark); font-size: 18px; letter-spacing: 0.04em; white-space: nowrap; }
.service-qq .copy-button { min-height: 34px; margin: 0 0 0 auto; padding: 0 12px; font-size: 13px; white-space: nowrap; }

.service-tip { color: #a2938d; font-size: 11px; line-height: 1.6; margin-top: 12px; }

/* ---------- 中屏适配（≤1000px：平板） ---------- */
@media (width <= 1000px) {
  .site-header { padding-inline: 20px; }
  .site-nav { gap: 0; }
  .site-nav a { padding-inline: 9px; font-size: 13px; }
  .header-cta { display: none; }

  .hero { grid-template-columns: 1fr; gap: 42px; padding-top: 70px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .invite-card { justify-self: center; }
  .outbound-note { text-align: left; }
  .trust-row { justify-content: center; }

  .truth-strip { grid-template-columns: 1fr 1fr; margin-inline: 24px; }
  .truth-strip div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .truth-strip div:nth-child(4) { border-top: 1px solid var(--line); }

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

  .app-preview-grid { grid-template-columns: 1fr 1fr; }

  .app-preview-card:last-child { grid-column: 1 / -1; max-width: calc(50% - 11px); justify-self: center; }

  .guide-grid { grid-template-columns: 1fr; }
  .guide-card { min-height: 280px; }
  .guide-card > span { margin-top: 34px; }

  .proof-section { grid-template-columns: 1fr; gap: 40px; }

  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-grid > div:last-child { grid-column: 1 / -1; }
}

/* ---------- 小屏适配（≤720px：手机） ---------- */
@media (width <= 720px) {
  body { padding-bottom: 60px; } /* 给底部注册栏留出空间 */

  .site-header { height: 68px; }
  .brand-copy strong { font-size: 14px; }
  .brand-copy small { display: none; }
  .brand-mark { width: 36px; height: 36px; }

  .menu-button { display: inline-flex; }

  /* 移动端下拉导航 */
  .site-nav {
    position: absolute;
    top: 62px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: 0 20px 50px #2d1d1629;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 13px; }

  .hero { min-height: auto; padding: 56px 20px 64px; }
  .hero h1 { font-size: 43px; }
  .hero-lead { font-size: 16px; }
  .hero-actions,
  .hero-actions > * { width: 100%; }
  .trust-row {
    display: grid;
    justify-items: start;
    align-self: stretch;
    padding: 18px;
    background: #ffffffa6;
    border-radius: 16px;
  }
  .invite-card { width: 100%; padding: 17px; }

  .truth-strip { grid-template-columns: 1fr; margin: 0 20px; }
  .truth-strip div + div,
  .truth-strip div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }

  .section-wrap { padding: 76px 20px; }
  .section-heading { margin-bottom: 30px; }
  .section-heading h2,
  .proof-copy h2 { font-size: 34px; }

  .answer-grid,
  .steps-grid,
  .app-preview-grid { grid-template-columns: 1fr; }

  .app-preview-card:last-child { grid-column: auto; max-width: none; }

  .direct-answer { padding: 28px; }
  .step-card { min-height: auto; }
  .guide-card { min-height: 300px; padding: 26px; }

  .final-cta {
    flex-direction: column;
    align-items: stretch;
    margin: 10px 20px 80px;
    padding: 34px 26px;
  }
  .final-cta h2 { font-size: 31px; }
  .final-actions > * { width: 100%; }

  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-grid > div:last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; }

  /* 移动端底部注册栏 */
  .mobile-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 60px;
    color: #fff;
    background: var(--coral);
    font-size: 14px;
    font-weight: 900;
    box-shadow: 0 -8px 28px #60221833;
  }

  /* 客服按钮上移，避开底部注册栏 */
  .service-widget { right: 16px; bottom: 76px; }
  .service-fab { padding: 12px 16px; }
  .service-panel { width: min(288px, calc(100vw - 32px)); }
}

/* ---------- 减弱动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}