/* ============================================================
   365登录 · 共享样式 /assets/site.css
   流程控制台视觉系统：切角 + 细线网格 + 近单色蓝阶叙事
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h,80px) + 16px)}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 设计变量 ---------- */
:root{
  --blue:#1A5CFF;
  --blue-deep:#0F49D6;
  --ink:#0B1B33;
  --mist:#F4F7FB;
  --white:#FFFFFF;
  --orange:#FF6B35;
  --orange-deep:#E2551F;
  --cyan:#00D4C8;
  --amber:#FFB020;
  --blue-300:#7FA3FF;
  --blue-100:#DCE6FF;
  --ink-500:#334A6B;
  --ink-400:#5A719B;

  --font-display:'Inter Tight','Noto Sans SC','PingFang SC','Hiragino Sans GB',sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:64px;
  --header-h:80px;
  --angle:7deg;
  --cut:16px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.2s;
  --shadow-1:0 16px 40px rgba(11,27,51,.08);
  --shadow-2:0 24px 60px rgba(11,27,51,.14);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.16}
h1{font-size:clamp(34px,5vw,64px);letter-spacing:-.03em}
h2{font-size:clamp(26px,3.2vw,40px);letter-spacing:-.025em}
h3{font-size:clamp(19px,1.6vw,24px);font-weight:700;letter-spacing:-.02em}
h4{font-size:18px;font-weight:700}
p{max-width:38em;margin-bottom:1.05em}
p:last-child{margin-bottom:0}
strong{font-weight:700}
::selection{background:rgba(26,92,255,.18);color:var(--ink)}

/* ---------- 4. 全局焦点与无障碍 ---------- */
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:2px}
.section--ink :focus-visible,.site-footer :focus-visible{outline-color:var(--cyan)}
.site-header :focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.site-header[data-state="solid"] :focus-visible,
.site-header[data-open="true"] :focus-visible{outline-color:var(--blue)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  background:var(--ink);color:#fff;border-radius:2px;
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none;outline:2px solid var(--cyan);outline-offset:2px}
body.nav-open{overflow:hidden}

/* ---------- 5. 容器与工具类 ---------- */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.offset-top{padding-top:calc(var(--header-h) + 48px)}
.mono-label{
  display:inline-block;
  font-family:var(--font-mono);font-size:11px;line-height:1.4;
  letter-spacing:.16em;text-transform:uppercase;color:var(--ink-500);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--blue);
}
.eyebrow::before{content:'';width:18px;height:2px;background:var(--orange)}
.bevel{clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut))}

/* ---------- 6. 按钮 ---------- */
.btn{
  position:relative;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;
  font-family:var(--font-body);font-size:14px;font-weight:600;line-height:1;letter-spacing:.01em;
  border:1px solid transparent;border-radius:3px;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.btn::after{
  content:'';position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--cyan);transform:scaleY(0);transform-origin:50% 0;
  transition:transform var(--dur) var(--ease);
}
.btn:hover::after,.btn:focus-visible::after{transform:scaleY(1)}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:var(--blue-deep);transform:translateY(-1px);box-shadow:0 12px 26px rgba(26,92,255,.3)}
.btn--primary:active{transform:none;box-shadow:none}
.btn--ghost{background:transparent;border-color:currentColor;color:inherit}
.btn--ghost:hover{background:rgba(26,92,255,.1);border-color:var(--blue);color:var(--blue)}
.btn--accent{background:var(--orange);color:#fff}
.btn--accent:hover{background:var(--orange-deep);transform:translateY(-1px);box-shadow:0 12px 26px rgba(255,107,53,.3)}
.btn--line{background:#fff;border-color:var(--blue-100);color:var(--ink)}
.btn--line:hover{border-color:var(--blue);color:var(--blue)}
.btn--sm{padding:9px 15px;font-size:13px}
.btn--lg{padding:16px 28px;font-size:15px}
.btn--block{width:100%}

/* ---------- 7. 页头 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  --hdr-fg:#FFFFFF;
  --hdr-muted:rgba(255,255,255,.72);
  --hdr-line:rgba(255,255,255,.2);
  --hdr-chip:rgba(0,212,200,.16);
  color:var(--hdr-fg);
  background:linear-gradient(180deg,rgba(11,27,51,.93) 0%,rgba(11,27,51,.86) 72%,rgba(11,27,51,.62) 100%);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  backdrop-filter:saturate(140%) blur(10px);
  transition:background .25s var(--ease),box-shadow .25s var(--ease),color .2s var(--ease);
}
.site-header[data-state="solid"],
.site-header[data-open="true"]{
  --hdr-fg:var(--ink);
  --hdr-muted:var(--ink-500);
  --hdr-line:rgba(11,27,51,.14);
  --hdr-chip:rgba(0,212,200,.14);
  background:#FFFFFF;
  box-shadow:0 1px 0 var(--blue-100),0 14px 34px rgba(11,27,51,.07);
}
.header-inner{
  display:flex;align-items:center;gap:18px;
  height:var(--header-h);
}
.header-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;overflow:hidden;
  background:rgba(127,163,255,.22);
}
.header-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--blue) 0%,var(--cyan) 78%,var(--orange) 100%);
  transition:transform .1s linear;
}
.site-header[data-state="solid"] .header-progress{background:var(--blue-100)}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0;flex:0 0 auto}
.brand__mark{
  flex:0 0 auto;width:40px;height:40px;
  display:grid;place-items:center;
  background:var(--blue);color:#fff;
  font-family:var(--font-mono);font-weight:700;font-size:13px;letter-spacing:-.04em;
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
  transition:background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.brand:hover .brand__mark{background:var(--orange);transform:translateY(-1px)}
.brand__text{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.025em;color:var(--hdr-fg)}
.brand__tagline{
  margin-top:3px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.05em;
  color:var(--hdr-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.brand__badge{
  display:inline-flex;align-items:center;gap:6px;
  margin-left:6px;padding:5px 9px;
  border:1px solid var(--hdr-line);background:var(--hdr-chip);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--hdr-fg);white-space:nowrap;
}
.brand__badge::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--cyan);flex:0 0 auto}

/* 桌面导航 */
.site-nav{margin-left:auto;display:flex;align-items:center}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{flex:0 0 auto;display:block}
.nav-link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 11px;
  font-size:14.5px;font-weight:500;color:var(--hdr-fg);
  transition:color var(--dur) var(--ease);
}
.nav-index{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.06em;
  color:var(--hdr-muted);transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:'';position:absolute;left:11px;right:11px;bottom:1px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .22s var(--ease),background var(--dur) var(--ease);
}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link:hover .nav-index{color:var(--cyan)}
.nav-link[aria-current="page"]{font-weight:700;color:var(--hdr-fg)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}

.header-actions{
  display:flex;align-items:center;gap:10px;
  margin-left:16px;padding-left:16px;border-left:1px solid var(--hdr-line);
}
.nav-cta{display:none}
.nav-cta__note{
  margin:6px 0 0;max-width:none;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;color:var(--ink-500);
}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;justify-content:center;
  margin-left:auto;
  width:44px;height:44px;
  border:1px solid var(--hdr-line);
  color:var(--hdr-fg);background:transparent;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bars{
  position:relative;display:block;width:18px;height:12px;
  background:linear-gradient(currentColor,currentColor) center/100% 2px no-repeat;
}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:'';position:absolute;left:0;width:100%;height:2px;background:currentColor;
  transition:transform .22s var(--ease),top .22s var(--ease),bottom .22s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:none}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{bottom:5px;transform:rotate(-45deg)}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;isolation:isolate;overflow:hidden;
  padding-top:76px;
  color:#DCE6F5;
  background:
    radial-gradient(120% 90% at 88% -20%,rgba(26,92,255,.42),transparent 62%),
    radial-gradient(70% 60% at -10% 110%,rgba(0,212,200,.14),transparent 60%),
    var(--ink);
}
.site-footer::before{
  content:'';position:absolute;top:0;left:0;right:0;height:4px;z-index:2;
  background:linear-gradient(90deg,
    var(--blue) 0%,var(--blue) 34%,
    var(--cyan) 34%,var(--cyan) 46%,
    var(--orange) 46%,var(--orange) 56%,
    var(--blue-300) 56%,var(--blue-300) 100%);
}
.site-footer::after{
  content:'';position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.8;
  background-image:
    linear-gradient(to right,rgba(127,163,255,.09) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(127,163,255,.09) 1px,transparent 1px);
  background-size:72px 72px;
}
.site-footer>.shell{position:relative;z-index:1}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.35fr) minmax(0,.95fr);
  gap:56px;
  padding-bottom:52px;
}
.footer-lead{display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.footer-lead .brand__mark{background:#fff;color:var(--ink)}
.footer-lead .brand:hover .brand__mark{background:var(--cyan);color:var(--ink)}
.footer-lead .brand__name{color:#fff}
.footer-summary{font-size:14.5px;line-height:1.85;color:#A9BCD8;max-width:32em}
.footer-stamp{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  max-width:none;margin:0;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;
  color:#8FA4C4;
}
.footer-stamp__sep{color:rgba(127,163,255,.5)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-mono);font-size:10.5px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
  margin-bottom:16px;
}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;color:#C2D2E8;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:#fff;border-color:var(--cyan)}
.footer-link[aria-current="page"]{color:#fff;border-color:var(--orange)}
.footer-contact{display:grid;gap:12px;align-content:start;min-width:0}
.footer-contact__title{
  font-family:var(--font-mono);font-size:10.5px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
  margin-bottom:4px;
}
.footer-contact__row{
  display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:baseline;
  font-size:13.5px;color:#DCE6F5;
}
.footer-contact__k{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;
  color:#7E93B4;
}
.footer-contact__v{min-width:0;word-break:break-word}
.footer-note{font-size:12px;line-height:1.75;color:#8FA4C4;max-width:30em;margin-top:4px}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 24px;
  padding:20px 0 28px;
  border-top:1px solid rgba(127,163,255,.22);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:#8FA4C4;
}
.footer-base__meta{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.footer-base__links{display:flex;flex-wrap:wrap;gap:18px}
.footer-base__links .footer-link{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:#8FA4C4}
.footer-base__links .footer-link:hover{color:#fff}

/* ---------- 9. 章节与叙事带 ---------- */
.section{position:relative;padding:96px 0}
.section--tight{padding:56px 0}
.section--mist{background:var(--mist)}
.section--ink{background:var(--ink);color:#E7EEFA}
.section--blue{background:var(--blue);color:#fff}
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:22px;align-items:start;
  margin-bottom:40px;
}
.section-num{
  padding-top:10px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.16em;color:var(--orange);
}
.section-title{margin:0}
.section-lead{
  margin:16px 0 0;max-width:38em;
  font-size:17px;line-height:1.8;color:var(--ink-500);
}
.section--ink .section-lead{color:#A9BCD8}
.section--blue .section-lead{color:rgba(255,255,255,.82)}
.section--ink .section-title,.section--blue .section-title{color:#fff}

/* ---------- 10. 网格 ---------- */
.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))}

/* ---------- 11. 面板卡片 ---------- */
.panel{
  position:relative;
  padding:28px;
  background:#fff;
  border:1px solid var(--blue-100);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.panel::before{
  content:'';position:absolute;top:-1px;left:-1px;width:44px;height:3px;background:var(--blue);
  transition:background var(--dur) var(--ease),width var(--dur) var(--ease);
}
.panel:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow-1)}
.panel:hover::before{width:72px;background:var(--orange)}
.panel--tint{background:var(--mist)}
.panel--ink{background:var(--ink);border-color:rgba(127,163,255,.32);color:#DCE6F5}
.panel--ink:hover{border-color:var(--cyan);box-shadow:var(--shadow-2)}
.panel__title{font-family:var(--font-display);font-size:19px;font-weight:700;letter-spacing:-.02em;margin:0 0 8px}
.panel--ink .panel__title{color:#fff}
.panel__text{font-size:15px;line-height:1.75;color:var(--ink-500);margin:0}
.panel--ink .panel__text{color:#A9BCD8}

/* ---------- 12. 步骤条 ---------- */
.steps{display:grid;gap:14px}
.step{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:18px;align-items:start;
  padding:20px 22px;background:#fff;border:1px solid var(--blue-100);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.step:hover{border-color:var(--blue);background:rgba(220,230,255,.22)}
.step__num{
  width:34px;height:34px;display:grid;place-items:center;
  background:var(--blue);color:#fff;
  font-family:var(--font-mono);font-size:12.5px;font-weight:700;letter-spacing:-.02em;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
  transition:background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.step:hover .step__num{background:var(--orange);transform:translateY(-2px)}
.step__title{font-family:var(--font-display);font-size:16.5px;font-weight:700;letter-spacing:-.01em;margin:0}
.step__text{margin:6px 0 0;font-size:15px;line-height:1.72;color:var(--ink-500);max-width:36em}

/* ---------- 13. 标签与状态点 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
  border:1px solid var(--blue-100);
  background:rgba(220,230,255,.45);
  color:var(--ink-500);
  white-space:nowrap;
}
.tag--cyan{border-color:rgba(0,212,200,.5);background:rgba(0,212,200,.12);color:#00756F}
.tag--orange{border-color:rgba(255,107,53,.5);background:rgba(255,107,53,.1);color:#C2410C}
.tag--amber{border-color:rgba(255,176,32,.55);background:rgba(255,176,32,.14);color:#8A5A00}
.site-footer .tag{border-color:rgba(127,163,255,.4);background:rgba(127,163,255,.12);color:#C7D6EC}
.site-footer .tag--cyan{border-color:rgba(0,212,200,.45);background:rgba(0,212,200,.14);color:#7CF0E8}
.dot{display:inline-block;flex:0 0 auto;width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 3px rgba(0,212,200,.18)}
.dot--orange{background:var(--orange);box-shadow:0 0 0 3px rgba(255,107,53,.18)}
.dot--amber{background:var(--amber);box-shadow:0 0 0 3px rgba(255,176,32,.2)}

/* ---------- 14. 对照表 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--blue-100);background:#fff}
.data-table{min-width:560px;font-size:15px}
.data-table th{
  padding:14px 18px;text-align:left;
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  background:var(--blue-100);color:var(--ink);
  border-bottom:1px solid #C7D5F7;
  white-space:nowrap;
}
.data-table td{
  padding:14px 18px;
  border-bottom:1px solid var(--blue-100);
  color:var(--ink-500);vertical-align:top;line-height:1.7;
}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr{transition:background var(--dur) var(--ease)}
.data-table tbody tr:hover td{background:rgba(244,247,251,.9)}
.data-table td:first-child{color:var(--ink);font-weight:600;white-space:nowrap}

/* ---------- 15. 图片容器（供页面阶段放置） ---------- */
.media-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  background:
    radial-gradient(120% 100% at 78% 0%,rgba(26,92,255,.55),transparent 60%),
    linear-gradient(140deg,#0B1B33 0%,#123A7A 62%,#1A5CFF 100%);
  border:1px solid rgba(127,163,255,.35);
}
.media-frame::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(127,163,255,.14) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(127,163,255,.14) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame__tag{
  position:absolute;z-index:2;top:12px;left:12px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;
  background:rgba(11,27,51,.72);color:#fff;border:1px solid rgba(127,163,255,.4);
}
.media-frame__caption{
  position:absolute;z-index:2;left:0;right:0;bottom:0;
  padding:18px 16px 14px;
  font-size:13px;line-height:1.6;color:#DCE6F5;
  background:linear-gradient(180deg,transparent,rgba(11,27,51,.86));
}

/* ---------- 16. 左侧流程导航 ---------- */
.flow-layout{display:grid;grid-template-columns:224px minmax(0,1fr);gap:48px;align-items:start}
.flow-rail{position:sticky;top:calc(var(--header-h) + 24px)}
.flow-rail__label{
  display:block;margin-bottom:12px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-400);
}
.flow-rail__list{display:flex;flex-direction:column;gap:2px;border-left:2px solid var(--blue-100)}
.flow-rail__link{
  display:flex;align-items:baseline;gap:10px;
  padding:10px 12px;
  margin-left:-2px;
  border-left:2px solid transparent;
  font-size:13.5px;color:var(--ink-500);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.flow-rail__index{font-family:var(--font-mono);font-size:10.5px;color:var(--blue-300);transition:color var(--dur) var(--ease)}
.flow-rail__link:hover{color:var(--blue);border-color:var(--blue-300);background:rgba(220,230,255,.4)}
.flow-rail__link[aria-current="true"]{
  color:var(--ink);font-weight:600;border-color:var(--orange);background:#fff;
}
.flow-rail__link[aria-current="true"] .flow-rail__index{color:var(--orange)}
.flow-content{min-width:0}

/* ---------- 17. 面包屑 ---------- */
.breadcrumbs{padding:20px 0 0}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--ink-400)}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:'/';color:var(--blue-300)}
.breadcrumbs__link{color:var(--ink-400);border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.breadcrumbs__link:hover{color:var(--blue);border-color:var(--blue-300)}
.breadcrumbs__item[aria-current="page"]{color:var(--ink)}

/* ---------- 18. 长文排版 ---------- */
.prose{max-width:44em}
.prose p{max-width:38em;font-size:16.5px;line-height:1.85;color:var(--ink-500)}
.prose h3{margin:32px 0 12px}
.prose h4{margin:24px 0 8px}
.prose strong{color:var(--ink)}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px;color:var(--ink-500)}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:8px;line-height:1.8}
.prose li::marker{color:var(--blue);font-family:var(--font-mono);font-size:.9em}
.prose a{color:var(--blue);border-bottom:1px solid var(--blue-100);transition:border-color var(--dur) var(--ease)}
.prose a:hover{border-color:var(--blue)}

/* ---------- 19. 显现与动效协议 ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 20. 响应式 ---------- */
@media (max-width:1200px){
  :root{--gutter:48px}
  .brand__tagline{display:none}
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr) minmax(0,1fr);gap:40px}
}
@media (max-width:1080px){
  .brand__badge{display:none}
  .nav-link{padding:9px 8px;font-size:13.5px}
  .nav-link::after{left:8px;right:8px}
  .header-actions .btn--ghost{display:none}
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1}
  .flow-layout{grid-template-columns:1fr;gap:28px}
  .flow-rail{position:static}
  .flow-rail__list{flex-direction:row;overflow-x:auto;border-left:0;border-bottom:2px solid var(--blue-100);padding-bottom:6px}
  .flow-rail__link{margin-left:0;border-left:0;border-bottom:2px solid transparent;white-space:nowrap;margin-bottom:-8px;padding:10px 12px}
  .flow-rail__link[aria-current="true"]{border-bottom-color:var(--orange);background:rgba(244,247,251,.9)}
}
@media (max-width:960px){
  :root{--gutter:32px;--header-h:64px}
  .nav-toggle{display:inline-flex}
  .header-actions{display:none}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;
    margin:0;display:flex;flex-direction:column;align-items:stretch;
    padding:8px var(--gutter) 32px;
    background:#fff;color:var(--ink);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-12px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-top:8px}
  .nav-link{
    display:flex;align-items:center;gap:12px;
    padding:18px 0;font-size:17px;font-weight:600;
    color:var(--ink);border-bottom:1px solid var(--blue-100);
  }
  .nav-index{font-size:11px;color:var(--blue-300)}
  .nav-link::after{display:none}
  .nav-link:hover,.nav-link:focus-visible{color:var(--blue)}
  .nav-link[aria-current="page"]{color:var(--blue)}
  .nav-link[aria-current="page"] .nav-index{color:var(--orange)}
  .nav-cta{display:grid;gap:10px;margin-top:26px}
  .nav-cta .btn{width:100%}
  .section{padding:72px 0}
  .section--tight{padding:44px 0}
  .section-head{grid-template-columns:1fr;gap:10px}
  .section-num{padding-top:0}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer{padding-top:60px}
}
@media (max-width:720px){
  :root{--gutter:20px;--header-h:60px}
  body{font-size:16px}
  .brand__mark{width:36px;height:36px;font-size:12px}
  .brand__name{font-size:17px}
  .section{padding:56px 0}
  .section-head{margin-bottom:28px}
  .grid{gap:16px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .panel{padding:22px}
  .step{padding:18px;gap:14px}
  .footer-inner{grid-template-columns:1fr;gap:34px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-base{justify-content:flex-start}
  .footer-base__links{gap:14px}
  .media-grid{grid-template-columns:1fr}
}
@media (max-width:480px){
  .footer-cols{grid-template-columns:1fr}
  .btn--lg{padding:14px 20px;font-size:14px}
  .data-table{font-size:14px}
}

/* ---------- 21. 降低动效 ---------- */
@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 [data-reveal]{opacity:1;transform:none}
  .btn:hover,.panel:hover,.step:hover .step__num,.brand:hover .brand__mark{transform:none}
}