/* ========== 全领优AI skill 效果展示 · 基础样式 ========== */
:root{
  --brand:#12707F;
  --brand-500:#1B8A9C;
  --brand-400:#2A9DB0;
  --brand-50:#EDF7F9;
  --brand-100:#D6EEF2;
  --ink-900:#0E1B1F;
  --ink-700:#33474D;
  --ink-500:#6B7F86;
  --ink-300:#9AAEB4;
  --bg:#F7FAFB;
  --card:#FFFFFF;
  --line:#E4EDEF;
  --line-strong:#D2E0E4;
  --grad-btn:linear-gradient(90deg,#F5A623 0%,#8CC63F 42%,#29ABE2 100%);
  --radius-sm:8px;
  --radius:14px;
  --radius-lg:18px;
  --shadow-1:0 1px 2px rgba(14,27,31,.04),0 2px 8px rgba(14,27,31,.05);
  --shadow-2:0 10px 28px rgba(14,27,31,.10);
  --header-h:68px;
  --shell:1280px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink-900);
  font:15px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.3;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:var(--brand-100);color:var(--brand)}
:focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:6px}

.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 32px}
.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}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;height:var(--header-h);
  background:rgba(247,250,251,.86);
  backdrop-filter:saturate(160%) blur(12px);
  -webkit-backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid transparent;transition:border-color .2s var(--ease),background .2s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--line);background:rgba(247,250,251,.95)}
.header-inner{height:100%;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-logo{border-radius:9px;object-fit:cover}
.brand-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;
  background:linear-gradient(140deg,#1B8A9C,#12707F);
  box-shadow:0 2px 8px rgba(18,112,127,.28);flex:none;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-text strong{font-size:16px;font-weight:700;letter-spacing:.01em;white-space:nowrap}
.brand-text em{font-size:11px;font-style:normal;color:var(--ink-300);letter-spacing:.14em;text-transform:uppercase;margin-top:2px}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-link{
  padding:8px 16px;border-radius:999px;font-size:14.5px;font-weight:500;color:var(--ink-700);
  transition:background .16s var(--ease),color .16s var(--ease);
}
.nav-link:hover{background:rgba(18,112,127,.07);color:var(--brand)}
.nav-link.is-active{background:var(--brand-50);color:var(--brand);font-weight:600}
.nav-toggle{
  display:none;width:40px;height:40px;margin-left:auto;border:1px solid var(--line);background:var(--card);
  border-radius:10px;padding:0;cursor:pointer;flex-direction:column;gap:4px;align-items:center;justify-content:center;
}
.nav-toggle span{display:block;width:16px;height:1.6px;background:var(--ink-700);border-radius:2px;transition:transform .2s var(--ease),opacity .2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.6px) rotate(-45deg)}
.mobile-menu{
  display:none;position:absolute;left:0;right:0;top:var(--header-h);
  background:var(--card);border-bottom:1px solid var(--line);
  padding:8px 16px 16px;flex-direction:column;gap:2px;
  box-shadow:0 12px 24px rgba(14,27,31,.08);
}
.mobile-menu.is-open{display:flex}
.mobile-menu a{padding:13px 12px;border-radius:10px;font-size:15px;color:var(--ink-700);font-weight:500}
.mobile-menu a.is-active{background:var(--brand-50);color:var(--brand)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 26px;border-radius:999px;border:0;cursor:pointer;
  font-size:15px;font-weight:600;transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s;
  will-change:transform;
}
.btn:active{transform:scale(.985)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 4px 14px rgba(18,112,127,.24)}
.btn-primary:hover{background:var(--brand-500);box-shadow:0 8px 22px rgba(18,112,127,.28);transform:translateY(-1px)}
.btn-ghost{background:var(--card);color:var(--ink-700);border:1px solid var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand-400);color:var(--brand)}
.btn-sm{height:38px;padding:0 18px;font-size:13.5px}

/* 渐变描边胶囊（资料卡 4 按钮） */
.btn-grad{
  position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:52px;
  padding:0 18px;border-radius:999px;border:1.6px solid transparent;cursor:pointer;
  background:linear-gradient(#fff,#fff) padding-box,var(--grad-btn) border-box;
  color:var(--ink-900);font-size:15px;font-weight:600;letter-spacing:.02em;
  transition:transform .16s var(--ease),box-shadow .18s var(--ease),border-width .12s;
}
.btn-grad:hover{box-shadow:0 8px 20px rgba(41,171,226,.18);transform:translateY(-1px);border-width:2px}
.btn-grad:active{transform:scale(.988)}
.btn-grad.is-loading{opacity:.7;pointer-events:none}
.btn-grad.is-loading::after{
  content:"";width:14px;height:14px;border-radius:50%;margin-left:8px;
  border:2px solid var(--brand-100);border-top-color:var(--brand-400);
  animation:spin .7s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Forms ---------- */
.input,.textarea,.select{
  width:100%;border:1px solid var(--line-strong);background:var(--card);color:var(--ink-900);
  border-radius:10px;padding:10px 13px;font-size:14.5px;line-height:1.5;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.input:focus,.textarea:focus,.select:focus{
  outline:none;border-color:var(--brand-400);box-shadow:0 0 0 3px rgba(42,157,176,.13);
}
.textarea{min-height:110px;resize:vertical}
.field{margin-bottom:16px}
.field-label{display:block;font-size:13.5px;font-weight:600;color:var(--ink-700);margin-bottom:6px}
.field-hint{font-size:12.5px;color:var(--ink-500);margin-top:5px;line-height:1.6}
.form-error{color:#c0392b;font-size:13px;margin-top:6px}

/* ---------- Toast / Modal ---------- */
.toast{
  position:fixed;left:50%;bottom:32px;transform:translate(-50%,18px);
  background:var(--ink-900);color:#fff;padding:11px 20px;border-radius:999px;font-size:14px;
  opacity:0;pointer-events:none;transition:opacity .2s var(--ease),transform .2s var(--ease);z-index:200;
  max-width:80vw;text-align:center;
}
.toast.is-show{opacity:1;transform:translate(-50%,0)}
.modal{
  position:fixed;inset:0;z-index:150;display:none;align-items:center;justify-content:center;padding:24px;
}
.modal.is-open{display:flex}
.modal-mask{position:absolute;inset:0;background:rgba(10,22,26,.52);backdrop-filter:blur(3px)}
.modal-card{
  position:relative;background:var(--card);border-radius:var(--radius-lg);width:100%;max-width:560px;
  max-height:86vh;display:flex;flex-direction:column;box-shadow:0 24px 60px rgba(10,22,26,.28);
  animation:pop .22s var(--ease);
}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.985)}to{opacity:1;transform:none}}
.modal-head{display:flex;align-items:center;gap:12px;padding:18px 20px 12px;border-bottom:1px solid var(--line)}
.modal-title{font-size:16px;font-weight:700}
.modal-close{
  margin-left:auto;width:34px;height:34px;border-radius:50%;border:0;background:var(--bg);
  color:var(--ink-500);cursor:pointer;font-size:18px;line-height:1;display:grid;place-items:center;
  transition:background .16s,color .16s;
}
.modal-close:hover{background:var(--brand-50);color:var(--brand)}
.modal-body{padding:18px 20px;overflow:auto;font-size:14.5px;color:var(--ink-700)}
.modal-foot{padding:14px 20px 18px;display:flex;gap:10px;justify-content:flex-end;border-top:1px solid var(--line)}
.code-box{
  background:#0E1B1F;color:#D8EDF1;border-radius:12px;padding:14px 16px;
  font:13px/1.75 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;
  white-space:pre-wrap;word-break:break-word;max-height:46vh;overflow:auto;
}
.link-box{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px 14px;
  font-size:13.5px;word-break:break-all;color:var(--ink-700);
}
.qr-wrap{display:flex;flex-direction:column;align-items:center;gap:12px;padding:6px 0}
.qr-wrap img{width:260px;height:260px;object-fit:contain;border-radius:12px;border:1px solid var(--line);background:#fff}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);margin-top:64px;background:var(--card)}
.footer-inner{padding:28px 32px;display:flex;flex-direction:column;gap:8px;align-items:center;text-align:center}
.footer-line{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:center;color:var(--ink-500);font-size:13px}
.footer-line .icp{color:var(--ink-500);border-bottom:1px dashed var(--line-strong);padding-bottom:1px}
.footer-line .icp:hover{color:var(--brand);border-color:var(--brand-400)}
.footer-extra{color:var(--ink-300);font-size:12.5px}

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  :root{--header-h:60px}
  .shell{padding:0 20px}
  .nav{display:none}
  .nav-toggle{display:flex}
  .footer-inner{padding:24px 20px}
}
@media (max-width:767px){
  .shell{padding:0 16px}
  .brand-text em{display:none}
  .brand-text strong{font-size:15px}
  .site-footer{margin-top:44px}
  .modal{padding:0;align-items:flex-end}
  .modal-card{max-width:none;max-height:88vh;border-radius:18px 18px 0 0;animation:sheet .24s var(--ease)}
  @keyframes sheet{from{transform:translateY(40px);opacity:.6}to{transform:none;opacity:1}}
  .modal-body{padding-bottom:calc(18px + env(safe-area-inset-bottom))}
  .qr-wrap img{width:220px;height:220px}
  .toast{bottom:calc(22px + env(safe-area-inset-bottom))}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto}
}