/* ============================================================
   速发卡 SOONFK · 设计系统
   深空 / 全息 / 玻璃拟态 · 纯静态无外部依赖
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --bg:#04060f; --bg-2:#070b18; --bg-3:#0b1122;
  --panel:rgba(255,255,255,.035); --panel-2:rgba(255,255,255,.06);
  --line:rgba(140,170,255,.14); --line-strong:rgba(140,170,255,.28);
  --text:#e9eefc; --muted:#8d99b8; --dim:#5f6b8a;
  --cyan:#3ee6ff; --violet:#7b5cff; --pink:#ff4fd8; --ok:#2ae0a8; --warn:#ffb020; --danger:#ff5470;
  --radius:18px; --radius-sm:12px; --maxw:1200px;
  --font: "PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono: "JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --header-h:72px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. reset & 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html,body{margin:0;padding:0;overflow-x:hidden}
body{
  background-color:var(--bg);
  background-image:
    radial-gradient(1200px 620px at 82% -12%,rgba(123,92,255,.10),transparent 62%),
    radial-gradient(900px 520px at 6% -4%,rgba(62,230,255,.06),transparent 60%);
  background-attachment:fixed;
  color:var(--text);
  font-family:var(--font);
  font-size:15px;
  line-height:1.7;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:650;line-height:1.2;letter-spacing:-.01em}
p{margin:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer}
img,svg{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
code,pre,kbd{font-family:var(--mono)}
::selection{background:rgba(62,230,255,.28);color:#fff}
:focus-visible{outline:2px solid rgba(62,230,255,.65);outline-offset:2px}

/* ---------- 3. 布局 ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:96px 0;position:relative}
.page-main{padding-top:calc(var(--header-h) + 40px)}

.section-head{max-width:720px;margin:0 0 52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.wide{max-width:none;display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--cyan);padding:6px 12px;border-radius:999px;
  border:1px solid rgba(62,230,255,.26);background:rgba(62,230,255,.06);
  margin-bottom:16px;line-height:1.4;
}
.eyebrow::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan)}
.section-head h2{font-size:clamp(26px,3.4vw,40px);margin:0 0 14px}
.section-desc{color:var(--muted);font-size:16px;margin:0;line-height:1.8}

.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 4. 头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);
  background:rgba(4,6,15,.66);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.header-inner{height:100%;display:flex;align-items:center;gap:24px}
.brand{display:inline-flex;align-items:center;gap:11px;flex:none;min-width:0}
.brand-mark{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;flex:none;
  background:linear-gradient(145deg,rgba(62,230,255,.18),rgba(123,92,255,.22));
  border:1px solid var(--line-strong);color:var(--cyan);
  box-shadow:0 0 22px rgba(62,230,255,.18),inset 0 0 18px rgba(123,92,255,.15);
}
.brand-mark svg{width:22px;height:22px}
.brand-text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand-text strong{font-size:16px;letter-spacing:.06em;white-space:nowrap}
.brand-text small{font-family:var(--mono);font-size:9px;letter-spacing:.26em;color:var(--dim);margin-top:3px;white-space:nowrap}

.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{
  position:relative;padding:9px 14px;border-radius:10px;
  color:var(--muted);font-size:14px;transition:color .25s var(--ease),background .25s var(--ease);
}
.nav a:hover{color:var(--text)}
.nav a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:3px;height:1px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease);
  box-shadow:0 0 8px rgba(62,230,255,.6);
}
.nav a:hover::after,.nav a.active::after{transform:scaleX(1)}
.nav a.active{color:var(--text)}
.nav a.nav-cta{
  padding:9px 18px;border-radius:999px;color:var(--text);
  border:1px solid var(--line-strong);
  background:linear-gradient(135deg,rgba(62,230,255,.14),rgba(123,92,255,.18));
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.nav a.nav-cta::after{display:none}
.nav a.nav-cta:hover{box-shadow:0 0 24px rgba(62,230,255,.25);border-color:rgba(62,230,255,.45)}
.nav a.nav-cta.active{box-shadow:0 0 24px rgba(62,230,255,.22),inset 0 0 16px rgba(123,92,255,.16)}

.nav-toggle{
  display:none;margin-left:auto;width:42px;height:42px;flex:none;
  border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.03);
  padding:0;place-items:center;gap:4px;flex-direction:column;
}
.nav-toggle span{display:block;width:18px;height:1.5px;border-radius:2px;background:var(--text);transition:transform .28s var(--ease),opacity .28s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 26px;border-radius:999px;border:1px solid transparent;
  font-size:14.5px;font-weight:600;letter-spacing:.02em;line-height:1.2;
  white-space:nowrap;text-decoration:none;background:transparent;color:var(--text);
  transition:transform .25s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{
  background:linear-gradient(120deg,var(--cyan),var(--violet) 56%,var(--pink));
  color:#05070f;box-shadow:0 10px 30px rgba(62,230,255,.18);
}
.btn-primary:hover{box-shadow:0 14px 42px rgba(62,230,255,.36),0 0 28px rgba(123,92,255,.34)}
.btn-ghost{border-color:var(--line-strong);background:rgba(255,255,255,.02);color:var(--text)}
.btn-ghost:hover{border-color:rgba(62,230,255,.5);background:rgba(62,230,255,.06);box-shadow:0 0 24px rgba(62,230,255,.14)}
.btn-sm{padding:9px 18px;font-size:13px}
.btn-block{display:flex;width:100%}
.btn:disabled,.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none;pointer-events:none}

/* ---------- 6. 卡片 ---------- */
.card{
  position:relative;isolation:isolate;overflow:hidden;
  padding:26px;border-radius:var(--radius);
  background:linear-gradient(160deg,var(--panel-2),var(--panel) 46%,rgba(255,255,255,.02));
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;z-index:1;
  background:linear-gradient(150deg,rgba(62,230,255,.34),rgba(123,92,255,.20) 38%,rgba(255,255,255,.05) 64%,rgba(62,230,255,.16));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask-composite:exclude;
  pointer-events:none;
}
.card:hover{transform:translateY(-4px);box-shadow:0 22px 50px rgba(0,0,0,.45),0 0 36px rgba(62,230,255,.10)}
.card-glow::after{
  content:"";position:absolute;top:-120px;right:-80px;width:260px;height:260px;z-index:0;
  background:radial-gradient(circle,rgba(62,230,255,.20),transparent 66%);
  pointer-events:none;
}
.card > *{position:relative;z-index:2}

/* ---------- 7. 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;font-size:12px;line-height:1.5;font-weight:500;
  border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--muted);
  white-space:nowrap;
}
.badge-cyan{color:var(--cyan);border-color:rgba(62,230,255,.30);background:rgba(62,230,255,.08)}
.badge-ok{color:var(--ok);border-color:rgba(42,224,168,.30);background:rgba(42,224,168,.08)}
.badge-warn{color:var(--warn);border-color:rgba(255,176,32,.30);background:rgba(255,176,32,.08)}
.badge-danger{color:var(--danger);border-color:rgba(255,84,112,.30);background:rgba(255,84,112,.08)}
.badge-dim{color:var(--dim);border-color:var(--line);background:rgba(255,255,255,.02)}
.chip{
  display:inline-flex;align-items:center;padding:5px 11px;border-radius:8px;
  font-size:12px;line-height:1.5;color:var(--muted);
  background:rgba(255,255,255,.035);border:1px solid var(--line);
}

/* ---------- 8. 数据 ---------- */
.stat{display:flex;flex-direction:column;gap:4px;min-width:0}
.stat-num{
  display:inline;font-family:var(--mono);font-weight:700;letter-spacing:-.01em;
  font-size:clamp(26px,3vw,34px);line-height:1.15;
  background:linear-gradient(120deg,var(--cyan),var(--violet));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat-unit{font-family:var(--mono);font-size:13px;color:var(--dim);margin-left:5px}
.stat-label{display:block;color:var(--dim);font-size:13px;margin-top:6px}

/* ---------- 9. 表单 ---------- */
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}
.label{font-size:13px;color:var(--muted);font-weight:500}
.input,.select,.textarea{
  width:100%;padding:12px 14px;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:rgba(4,6,15,.55);color:var(--text);
  font-size:14px;line-height:1.5;outline:none;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
}
.input::placeholder,.textarea::placeholder{color:var(--dim)}
.input:focus,.select:focus,.textarea:focus{
  border-color:rgba(62,230,255,.5);background:rgba(7,11,24,.82);
  box-shadow:0 0 0 3px rgba(62,230,255,.10);
}
.select{appearance:none;-webkit-appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:38px}
.textarea{min-height:120px;resize:vertical}
.hint{font-size:12px;color:var(--dim);line-height:1.6}
.error-text{font-size:12px;color:var(--danger);line-height:1.6}
.input.invalid,.select.invalid,.textarea.invalid,
.field.invalid .input,.field.invalid .select,.field.invalid .textarea,
.invalid .input,.invalid .select,.invalid .textarea{
  border-color:rgba(255,84,112,.6);box-shadow:0 0 0 3px rgba(255,84,112,.10);
}
.field.invalid .label,.invalid .label{color:var(--danger)}

/* ---------- 10. 表格 ---------- */
.table-wrap{
  width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(255,255,255,.02);
}
.table{width:100%;min-width:640px;border-collapse:collapse;font-size:14px}
.table th{
  text-align:left;font-size:12px;font-weight:500;letter-spacing:.06em;color:var(--dim);
  padding:13px 16px;border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.02);position:sticky;top:0;z-index:1;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.table td{padding:14px 16px;border-bottom:1px solid rgba(140,170,255,.08);color:var(--text);vertical-align:middle}
.table tbody tr:last-child td{border-bottom:none}
.table tbody tr:hover{background:rgba(62,230,255,.03)}

/* ---------- 11. 杂项组件 ---------- */
.progress{height:6px;width:100%;border-radius:999px;background:rgba(255,255,255,.07);overflow:hidden}
.progress-bar{
  display:block;height:100%;border-radius:inherit;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  box-shadow:0 0 12px rgba(62,230,255,.45);
  transition:width .6s var(--ease);
}
.avatar{
  width:44px;height:44px;border-radius:50%;display:inline-grid;place-items:center;flex:none;
  font-weight:700;font-size:17px;color:#05070f;
  background:linear-gradient(140deg,var(--cyan),var(--violet) 60%,var(--pink));
  box-shadow:0 6px 18px rgba(123,92,255,.28);
}
.empty{
  padding:56px 24px;text-align:center;color:var(--dim);font-size:14px;line-height:1.8;
  border:1px dashed var(--line);border-radius:var(--radius);background:rgba(255,255,255,.015);
}
.divider{height:1px;width:100%;background:linear-gradient(90deg,transparent,var(--line-strong),transparent);margin:32px 0;border:0}
.kbd{
  display:inline-block;padding:2px 7px;border-radius:6px;font-size:11px;
  font-family:var(--mono);color:var(--muted);
  background:rgba(255,255,255,.05);border:1px solid var(--line);border-bottom-width:2px;
}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.timeline{position:relative;padding-left:28px}
.timeline::before{
  content:"";position:absolute;left:7px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(180deg,rgba(62,230,255,.5),rgba(123,92,255,.2));
}
.timeline li{position:relative;padding:0 0 24px;color:var(--muted);font-size:14px}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{
  content:"";position:absolute;left:-27px;top:7px;width:9px;height:9px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 10px rgba(62,230,255,.7);
}
.tabs{
  display:flex;gap:6px;padding:5px;width:max-content;max-width:100%;overflow-x:auto;
  border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.02);
}
.tab{
  appearance:none;border:0;background:transparent;color:var(--muted);
  padding:8px 18px;border-radius:999px;font-size:13px;white-space:nowrap;
  transition:color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.tab:hover{color:var(--text)}
.tab.active{
  color:var(--text);background:linear-gradient(120deg,rgba(62,230,255,.18),rgba(123,92,255,.22));
  box-shadow:0 0 16px rgba(62,230,255,.12);
}

/* ---------- 12. Toast / Modal / Skeleton ---------- */
.toast-wrap{
  position:fixed;right:20px;bottom:20px;z-index:300;
  display:flex;flex-direction:column;gap:10px;align-items:flex-end;
  max-width:min(360px,calc(100vw - 32px));pointer-events:none;
}
.toast{
  pointer-events:auto;display:flex;align-items:flex-start;gap:10px;
  padding:13px 16px;border-radius:14px;max-width:100%;
  border:1px solid var(--line-strong);background:rgba(7,11,24,.94);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  box-shadow:0 16px 48px rgba(0,0,0,.5);color:var(--text);font-size:14px;line-height:1.55;
  animation:toast-in .3s var(--ease);
}
.toast::before{
  content:"";width:8px;height:8px;border-radius:50%;margin-top:7px;flex:none;
  background:var(--cyan);box-shadow:0 0 10px var(--cyan);
}
.toast-ok::before{background:var(--ok);box-shadow:0 0 10px var(--ok)}
.toast-warn::before{background:var(--warn);box-shadow:0 0 10px var(--warn)}
.toast-danger::before{background:var(--danger);box-shadow:0 0 10px var(--danger)}
.toast.out{animation:toast-out .25s ease forwards}
@keyframes toast-in{from{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:none}}
@keyframes toast-out{to{opacity:0;transform:translateY(8px) scale(.98)}}

.modal{
  position:fixed;inset:0;z-index:250;display:none;align-items:center;justify-content:center;
  padding:24px;background:rgba(2,4,10,.72);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.modal.open{display:flex}
.modal-panel{
  width:min(520px,100%);max-height:86vh;overflow:auto;padding:28px;
  background:var(--bg-2);border:1px solid var(--line-strong);border-radius:var(--radius);
  box-shadow:0 30px 80px rgba(0,0,0,.6);
}
.skeleton{
  position:relative;overflow:hidden;min-height:1em;border-radius:8px;
  background:rgba(255,255,255,.05);color:transparent !important;
}
.skeleton::after{
  content:"";position:absolute;inset:0;transform:translateX(-100%);
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent);
  animation:shimmer 1.4s infinite;
}
@keyframes shimmer{to{transform:translateX(100%)}}

/* ---------- 13. 工具类 ---------- */
.mono{font-family:var(--mono)}
.muted{color:var(--muted)}
.dim{color:var(--dim)}
.text-center{text-align:center}
.text-grad{
  background:linear-gradient(120deg,var(--cyan),var(--violet) 58%,var(--pink));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}
.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}
.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}
.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.wrap{flex-wrap:wrap}

/* ---------- 14. 背景层 ---------- */
.bg-fx{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.bg-grid{
  position:absolute;inset:-2px;
  background-image:
    linear-gradient(rgba(140,170,255,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,170,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse 80% 65% at 50% 12%,#000 18%,transparent 78%);
  mask-image:radial-gradient(ellipse 80% 65% at 50% 12%,#000 18%,transparent 78%);
}
.bg-aurora{position:absolute;inset:0}
.bg-aurora span{
  position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;
  animation:aurora 22s ease-in-out infinite alternate;
}
.bg-aurora span:nth-child(1){width:520px;height:520px;top:-160px;left:-120px;background:rgba(62,230,255,.20)}
.bg-aurora span:nth-child(2){width:560px;height:560px;top:-80px;right:-160px;background:rgba(123,92,255,.20);animation-delay:-7s}
.bg-aurora span:nth-child(3){width:480px;height:480px;bottom:-200px;left:38%;background:rgba(255,79,216,.12);animation-delay:-13s}
.bg-noise{
  position:absolute;inset:0;opacity:.035;
  background-image:radial-gradient(rgba(255,255,255,.6) .5px,transparent .6px);
  background-size:3px 3px;
}
#starfield{position:absolute;inset:0;width:100%;height:100%;display:block}
@keyframes aurora{
  0%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(40px,26px,0) scale(1.08)}
  100%{transform:translate3d(-24px,48px,0) scale(.94)}
}

/* 内容层压住背景 */
main,.site-footer{position:relative;z-index:1}

/* ---------- 15. 页脚 ---------- */
.site-footer{
  margin-top:40px;padding:64px 0 28px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(7,11,24,.2),rgba(4,6,15,.92));
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand .brand{margin-bottom:14px}
.footer-brand p{color:var(--muted);font-size:13px;line-height:1.9;margin:0;max-width:300px}
.footer-meta{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--dim);margin-top:14px}
.footer-col h4{font-size:13px;letter-spacing:.08em;color:var(--text);margin:4px 0 16px}
.footer-col a,.footer-col span{display:block;font-size:13px;color:var(--muted);padding:5px 0;transition:color .25s var(--ease)}
.footer-col a:hover{color:var(--cyan)}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12px;color:var(--dim);
}
.footer-disclaimer{color:var(--dim);font-size:12px;line-height:1.8;margin-top:14px;max-width:640px}

/* ---------- 16. FAQ 手风琴 ---------- */
.faq{display:flex;flex-direction:column;gap:12px}
.faq-item{
  border:1px solid var(--line);border-radius:var(--radius-sm);
  background:rgba(255,255,255,.025);overflow:hidden;
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.faq-item:hover{border-color:var(--line-strong);background:rgba(255,255,255,.035)}
.faq-item summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;cursor:pointer;font-size:15px;font-weight:550;list-style:none;
  color:var(--text);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";flex:none;font-family:var(--mono);font-size:18px;color:var(--cyan);
  transition:transform .3s var(--ease);line-height:1;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-body{padding:0 20px 20px;color:var(--muted);font-size:14px;line-height:1.85;margin:0}

/* ---------- 17. 入场动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1);
  will-change:opacity,transform;
}
[data-reveal].is-in{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-delay:0s !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .bg-aurora span{animation:none}
}

/* ---------- 18. 响应式 ---------- */
@media (max-width:1200px){
  .grid{gap:20px}
  .footer-grid{gap:28px}
}

@media (max-width:960px){
  .section{padding:80px 0}
  .section-head{margin-bottom:40px}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav{
    position:absolute;top:calc(var(--header-h) + 10px);left:24px;right:24px;
    flex-direction:column;align-items:stretch;gap:4px;margin-left:0;padding:12px;
    border:1px solid var(--line);border-radius:var(--radius);
    background:rgba(7,11,24,.97);
    -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
    box-shadow:0 24px 60px rgba(0,0,0,.5);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s;
  }
  .nav.open{opacity:1;visibility:visible;transform:none}
  .nav a{padding:12px 14px;border-radius:10px}
  .nav a::after{display:none}
  .nav a.active{color:var(--cyan);background:rgba(62,230,255,.08)}
  .nav a.nav-cta{text-align:center;margin-top:6px}
  .nav-toggle{display:inline-flex}
}

@media (max-width:720px){
  .container{padding:0 18px}
  .section{padding:64px 0}
  .grid{gap:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .card{padding:22px}
  .section-desc{font-size:15px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .input,.select,.textarea{font-size:16px}
  .toast-wrap{right:12px;left:12px;bottom:12px;max-width:none;align-items:stretch}
  .nav{left:18px;right:18px}
}

@media (max-width:480px){
  :root{--header-h:64px}
  .container{padding:0 16px}
  .brand-text small{display:none}
  .brand-mark{width:34px;height:34px;border-radius:10px}
  .brand-mark svg{width:19px;height:19px}
  .btn{padding:12px 20px;font-size:14px}
  .btn-sm{padding:8px 14px}
  .section{padding:56px 0}
  .card{padding:20px}
  .stat-num{font-size:24px}
  .avatar{width:40px;height:40px;border-radius:50%;font-size:15px}
  .faq-item summary{padding:16px;font-size:14px}
  .faq-body{padding:0 16px 16px}
  .nav{left:16px;right:16px}
}