:root {
  --pc-bg: #fff3e0;
  --pc-primary: #f0783f;
  --pc-primary-deep: #e05f28;
  --pc-text: #4a3728;
  --pc-muted: #9c8570;
  --pc-card: #fffaf2;
  --pc-peach: #fce8d5;
  --pc-accent: #ffc86b;
  --pc-line: rgba(74, 55, 40, 0.08);
  --pc-shadow: 0 10px 34px rgba(74, 55, 40, 0.10);
  --pc-warm-shadow: 0 14px 40px rgba(255, 140, 90, 0.16);
  --pc-radius: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', 'HarmonyOS Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--pc-bg);
  color: var(--pc-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ---------- 顶部导航 ---------- */
.pc-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(16px, 6vw, 88px);
  background: rgba(255, 243, 224, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--pc-line);
}
.pc-nav .brand { display: flex; align-items: center; gap: 12px; }
.pc-nav .brand img { width: 40px; height: 40px; border-radius: 10px; display: block; }
.pc-nav .brand b { font-size: 21px; font-weight: 700; letter-spacing: 2px; }
.pc-nav .nav-menu { display: flex; align-items: center; gap: 26px; }
.pc-nav .nav-menu a {
  font-size: 15px; color: var(--pc-muted); font-weight: 500; transition: color .2s;
}
.pc-nav .nav-menu a:hover { color: var(--pc-primary); }
.pc-nav .nav-right { display: flex; align-items: center; gap: 14px; }
.pc-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: none; cursor: pointer; font-family: inherit; font-weight: 600;
  border-radius: 999px; padding: 11px 26px; font-size: 15px; letter-spacing: 1px;
  transition: transform .15s, opacity .2s, background .2s;
}
.pc-btn:active { transform: translateY(1px); }
.pc-btn-primary { background: var(--pc-primary); color: #fff; }
.pc-btn-primary:hover { background: var(--pc-primary-deep); }
.pc-btn-ghost { background: transparent; color: var(--pc-primary); border: 1.5px solid var(--pc-primary); }
.pc-btn-ghost:hover { background: rgba(255, 140, 90, 0.08); }
.pc-btn-sm { padding: 8px 18px; font-size: 14px; }

.pc-nav .user-chip {
  display: inline-flex; align-items: center; gap: 9px; cursor: pointer;
  padding: 7px 16px; border-radius: 999px; background: #fff; border: 1px solid var(--pc-line);
}
.pc-nav .user-chip .avatar {
  width: 28px; height: 28px; border-radius: 50%; background: linear-gradient(135deg, #ffc86b, #ff8c5a);
  color: #fff; font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.pc-nav .user-chip .nick { font-size: 14px; color: var(--pc-text); max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- Hero ---------- */
.pc-hero {
  position: relative;
  text-align: center;
  padding: clamp(72px, 12vh, 130px) clamp(16px, 6vw, 88px) clamp(60px, 10vh, 110px);
  overflow: hidden;
}
.pc-hero::before {
  content: ""; position: absolute; width: 560px; height: 560px; left: -160px; top: -160px;
  background: radial-gradient(circle, rgba(255, 200, 107, 0.65), transparent 70%);
}
.pc-hero::after {
  content: ""; position: absolute; width: 620px; height: 620px; right: -200px; bottom: -220px;
  background: radial-gradient(circle, rgba(255, 140, 90, 0.35), transparent 70%);
}
.pc-hero > * { position: relative; z-index: 1; }
.pc-hero .hero-logo { margin: 0 auto 30px; filter: drop-shadow(0 14px 30px rgba(255, 140, 90, 0.25)); }
.pc-hero h1 {
  font-size: clamp(40px, 6vw, 72px); font-weight: 800; letter-spacing: 8px; line-height: 1.15;
}
.pc-hero .sub { margin-top: 22px; font-size: clamp(17px, 2vw, 22px); color: var(--pc-muted); letter-spacing: 3px; }
.pc-hero .ai-tag {
  display: inline-block; margin-top: 18px; font-size: 13px; color: var(--pc-muted); opacity: .85;
  background: rgba(255, 200, 107, 0.25); padding: 6px 16px; border-radius: 999px; letter-spacing: 1px;
}
.pc-hero .cta { margin-top: 46px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.pc-hero .cta .pc-btn { padding: 15px 46px; font-size: 17px; }

/* ---------- 通用 section ---------- */
.pc-section { max-width: 1120px; margin: 0 auto; padding: clamp(48px, 8vw, 90px) clamp(16px, 5vw, 40px); }
.pc-section .sec-head { text-align: center; margin-bottom: 52px; }
.pc-section .sec-head h2 { font-size: clamp(26px, 3vw, 36px); font-weight: 700; letter-spacing: 3px; }
.pc-section .sec-head p { margin-top: 12px; color: var(--pc-muted); font-size: 15px; }

/* ---------- 特性卡 ---------- */
.pc-feats { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.pc-feat {
  background: var(--pc-card); border-radius: var(--pc-radius); border: 1px solid var(--pc-line);
  box-shadow: var(--pc-shadow); padding: 30px 26px; cursor: pointer;
  transition: transform .25s, box-shadow .25s, border-color .25s; display: block;
}
.pc-feat:hover { transform: translateY(-6px); box-shadow: var(--pc-warm-shadow); border-color: rgba(255, 140, 90, 0.35); }
.pc-feat .feat-ico {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #ffe7d2, #ffd0b2); margin-bottom: 18px;
}
.pc-feat .feat-ico svg { width: 26px; height: 26px; }
.pc-feat h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.pc-feat p { font-size: 14px; color: var(--pc-muted); }

/* ---------- 三步 ---------- */
.pc-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pc-step {
  background: var(--pc-card); border: 1px solid var(--pc-line); border-radius: var(--pc-radius);
  padding: 34px 28px; text-align: left; box-shadow: var(--pc-shadow);
}
.pc-step .no {
  width: 42px; height: 42px; border-radius: 50%; background: var(--pc-primary); color: #fff;
  font-size: 19px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.pc-step h3 { font-size: 19px; margin-bottom: 10px; }
.pc-step p { color: var(--pc-muted); font-size: 14px; }
.pc-step .note { display: inline-block; margin-top: 12px; font-size: 12px; color: var(--pc-primary); }

/* ---------- 信任带 ---------- */
.pc-trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pc-trust .item { text-align: center; padding: 26px 16px; }
.pc-trust .item .t-ico {
  width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 50%;
  background: var(--pc-peach); display: flex; align-items: center; justify-content: center;
}
.pc-trust .item h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.pc-trust .item p { font-size: 13px; color: var(--pc-muted); }

/* ---------- CTA 条幅 ---------- */
.pc-banner {
  background: linear-gradient(120deg, #ffe7d2, #ffd0b2); border-radius: 24px;
  padding: clamp(32px, 5vw, 56px) clamp(20px, 5vw, 60px); text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.pc-banner h2 { font-size: clamp(22px, 3vw, 30px); letter-spacing: 2px; }
.pc-banner p { color: var(--pc-muted); font-size: 15px; }
.pc-banner .cta { margin-top: 12px; }

/* ---------- 页脚 ---------- */
.pc-footer { border-top: 1px solid var(--pc-line); padding: 36px clamp(16px, 6vw, 88px) 44px; text-align: center; }
.pc-footer .links { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; font-size: 14px; color: var(--pc-muted); }
.pc-footer .links a:hover { color: var(--pc-primary); }
.pc-footer .info { margin-top: 20px; font-size: 13px; color: var(--pc-muted); letter-spacing: 1px; }
.pc-footer .icp-links { margin-top: 10px; font-size: 12px; color: var(--pc-muted); display: flex; gap: 10px; justify-content: center; align-items: center; flex-wrap: wrap; }
.pc-footer .icp-links a { display: inline-flex; align-items: center; gap: 6px; color: var(--pc-muted); }
.pc-footer .icp-links a:hover { color: var(--pc-primary); }
.pc-footer .icp-sep { color: rgba(156, 133, 112, 0.5); font-size: 12px; }
.pc-footer .beian-icon { width: 14px; height: 14px; vertical-align: middle; }
.pc-footer .ai-risk {
  margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--pc-line);
  font-size: 12px; line-height: 1.6; text-align: center; letter-spacing: 0.5px;
  color: var(--pc-muted); opacity: .75;
}
.pc-footer .ai-risk strong { color: var(--pc-primary); margin-right: 6px; font-weight: 600; }

/* ---------- 模态框 ---------- */
.pc-mask {
  position: fixed; inset: 0; background: rgba(74, 55, 40, 0.45); z-index: 100;
  display: none; align-items: center; justify-content: center; padding: 20px; backdrop-filter: blur(3px);
}
.pc-mask.show { display: flex; }
.pc-modal {
  background: #fff; border-radius: 20px; max-width: 440px; width: 100%; padding: 34px 36px;
  box-shadow: 0 30px 80px rgba(74, 55, 40, 0.25); position: relative;
  animation: pc-up .28s ease;
}
@keyframes pc-up { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
.pc-modal .close {
  position: absolute; top: 14px; right: 18px; background: none; border: none; font-size: 24px;
  color: var(--pc-muted); cursor: pointer; line-height: 1;
}
.pc-modal h3 { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.pc-modal .desc { font-size: 13px; color: var(--pc-muted); margin-bottom: 22px; }
.pc-modal .field { margin-bottom: 16px; }
.pc-modal label { display: block; font-size: 13px; color: var(--pc-muted); margin-bottom: 6px; }
.pc-modal input {
  width: 100%; padding: 12px 14px; font-size: 15px; border: 1px solid var(--pc-line); border-radius: 10px;
  font-family: inherit; outline: none; transition: border-color .2s; background: #fdfaf5;
}
.pc-modal input:focus { border-color: var(--pc-primary); }
.pc-modal .captcha-row { display: flex; gap: 12px; }
.pc-modal .captcha-row img { height: 44px; width: 132px; border-radius: 8px; cursor: pointer; border: 1px solid var(--pc-line); }
.pc-modal .captcha-row .reload { font-size: 12px; color: var(--pc-primary); cursor: pointer; align-self: center; white-space: nowrap; }
.pc-modal .pc-btn { width: 100%; padding: 13px; margin-top: 6px; }
.pc-modal .msg { font-size: 13px; margin-top: 12px; min-height: 18px; }
.pc-modal .msg.error { color: #c0392b; }
.pc-modal .msg.ok { color: #27ae60; }
.pc-modal .switch { text-align: center; margin-top: 16px; font-size: 14px; color: var(--pc-muted); }
.pc-modal .switch a { color: var(--pc-primary); cursor: pointer; font-weight: 600; }
.pc-modal .back { text-align: center; margin-top: 10px; font-size: 13px; color: var(--pc-muted); }
.pc-modal .back a { color: var(--pc-muted); text-decoration: underline; cursor: pointer; }

/* ---------- 提示 toast ---------- */
.pc-toast {
  position: fixed; left: 50%; top: 24px; transform: translateX(-50%);
  background: #4a3728; color: #fff; padding: 12px 24px; border-radius: 999px; font-size: 14px; z-index: 200;
  opacity: 0; pointer-events: none; transition: opacity .3s; box-shadow: 0 10px 30px rgba(0,0,0,.18);
}
.pc-toast.show { opacity: 1; }
.pc-toast.error { background: #c0392b; }

@media (max-width: 720px) {
  .pc-nav .nav-menu { display: none; }
  .pc-steps, .pc-trust { grid-template-columns: 1fr; }
}