/* ==========================================================================
   365国际速发 · 共享样式表 /assets/site.css
   深空蓝铺底 · 电光青走路径 · 暖橙开关键入口 · 酒红/靛紫做专题房间
   ========================================================================== */

/* ------------------------------------------------------------------ reset */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--sf-header-h) + 20px);
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption,
blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video, picture { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; }

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

table { width: 100%; border-collapse: collapse; }

/* ----------------------------------------------------------------- tokens */
:root {
  --sf-deep: #061A33;
  --sf-deep-2: #0D2A4A;
  --sf-deep-3: #1C4570;
  --sf-cyan: #17E8D0;
  --sf-cyan-2: #0BA79A;
  --sf-cyan-3: #A8F5EE;
  --sf-cyan-soft: #CFF9F4;
  --sf-orange: #FF8A3D;
  --sf-orange-2: #C55A12;
  --sf-wine: #7A2340;
  --sf-indigo: #3B2E7E;
  --sf-paper: #F4F8FC;
  --sf-ink: #16202C;
  --sf-line: #C7D6E6;

  --sf-header-h: 76px;
  --sf-shell: 1200px;
  --sf-gutter: clamp(18px, 4vw, 44px);
  --sf-radius-s: 10px;
  --sf-radius-m: 20px;
  --sf-radius-l: 30px;
  --sf-radius-organic: 20px 20px 20px 56px;
  --sf-shadow-1: 0 12px 30px rgba(6, 26, 51, .14);
  --sf-shadow-2: 0 22px 54px rgba(6, 26, 51, .32);
  --sf-ease: cubic-bezier(.2, .7, .3, 1);

  --sf-font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sf-font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sf-font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ------------------------------------------------------- 基础排版与中文节奏 */
body {
  font-family: var(--sf-font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .008em;
  color: var(--sf-ink);
  background: var(--sf-paper);
  overflow-x: clip;
}

@media (min-width: 768px) {
  body { font-size: 18px; }
}

h1, h2, h3, h4, h5, h6,
.sf-display, .sf-h2, .sf-h3 {
  font-family: var(--sf-font-head);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  text-wrap: balance;
}

p { max-width: 38em; }

:focus-visible {
  outline: 3px solid var(--sf-cyan);
  outline-offset: 3px;
  border-radius: 8px;
}

.sf-band--deep :focus-visible,
.sf-band--wine :focus-visible,
.sf-band--indigo :focus-visible,
.sf-header :focus-visible,
.sf-footer :focus-visible { outline-color: var(--sf-orange); }

::selection { background: var(--sf-cyan); color: var(--sf-deep); }

/* ---------------------------------------------------------------- skip link */
.sf-skip {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--sf-cyan);
  color: var(--sf-deep);
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 15px;
  transform: translateY(-260%);
  transition: transform .16s var(--sf-ease);
}

.sf-skip:focus { transform: translateY(0); }

/* -------------------------------------------------------------------- 头部 */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 120;
  margin-bottom: calc(-1 * var(--sf-header-h));
  color: var(--sf-paper);
  background: linear-gradient(180deg, rgba(6, 26, 51, .90) 0%, rgba(6, 26, 51, .46) 100%);
  -webkit-backdrop-filter: blur(9px) saturate(1.15);
  backdrop-filter: blur(9px) saturate(1.15);
  border-bottom: 1px solid transparent;
  transition: background .24s var(--sf-ease), border-color .24s var(--sf-ease), box-shadow .24s var(--sf-ease);
}

.sf-header[data-stuck="true"] {
  background: var(--sf-deep);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border-bottom-color: var(--sf-deep-3);
  box-shadow: var(--sf-shadow-2);
}

.sf-header__rail { position: relative; }

.sf-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  min-height: var(--sf-header-h);
}

/* 品牌 */
.sf-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding-block: 10px;
}

.sf-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--sf-cyan) 0%, var(--sf-cyan-2) 58%, var(--sf-orange) 100%);
  box-shadow: 0 0 0 1px rgba(23, 232, 208, .35), 0 10px 22px rgba(11, 167, 154, .26);
}

.sf-brand__spark {
  width: 0;
  height: 0;
  margin-left: 4px;
  border-left: 12px solid var(--sf-deep);
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
}

.sf-brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.sf-brand__name { font-family: var(--sf-font-head); font-weight: 900; font-size: 19px; letter-spacing: -.02em; color: var(--sf-paper); }
.sf-brand__line { margin-top: 4px; font-family: var(--sf-font-mono); font-size: 11px; font-weight: 600; letter-spacing: .18em; color: var(--sf-cyan); }

/* 主导航 */
.sf-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 22px);
  margin-left: auto;
}

.sf-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .8vw, 12px);
}

.sf-nav__item { position: relative; }

.sf-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px 9px;
  border-radius: 10px;
  font-family: var(--sf-font-head);
  font-size: 15px;
  font-weight: 700;
  color: rgba(244, 248, 252, .80);
  transition: color .16s var(--sf-ease), background .16s var(--sf-ease);
}

.sf-nav__link::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 3px;
  height: 2px;
  background: var(--sf-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--sf-ease);
}

.sf-nav__link:hover { color: var(--sf-paper); background: rgba(23, 232, 208, .08); }
.sf-nav__link:hover::after { transform: scaleX(1); }

.sf-nav__link[aria-current="page"] { color: var(--sf-paper); }
.sf-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.sf-nav__num {
  font-family: var(--sf-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--sf-cyan);
  opacity: .78;
}

.sf-nav__link[aria-current="page"] .sf-nav__num { color: var(--sf-orange); opacity: 1; }
.sf-nav__label { display: inline-block; }
.sf-nav__actions { display: flex; align-items: center; gap: 10px; }

/* 汉堡按钮 */
.sf-navbtn {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 15px;
  border: 1px solid rgba(23, 232, 208, .45);
  border-radius: 999px;
  background: rgba(13, 42, 74, .62);
  color: var(--sf-paper);
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 14px;
  cursor: pointer;
  transition: border-color .16s var(--sf-ease), background .16s var(--sf-ease);
}

.sf-navbtn:hover { border-color: var(--sf-cyan); background: rgba(23, 232, 208, .14); }

.sf-navbtn__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
}

.sf-navbtn__bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--sf-cyan);
  transition: transform .18s var(--sf-ease), opacity .18s var(--sf-ease);
}

.sf-navbtn[aria-expanded="true"] .sf-navbtn__bar:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.sf-navbtn[aria-expanded="true"] .sf-navbtn__bar:nth-child(2) { opacity: 0; }
.sf-navbtn[aria-expanded="true"] .sf-navbtn__bar:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.sf-navbtn__text { display: inline-block; }

/* 滚动进度轨 */
.sf-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(199, 214, 230, .16);
  overflow: hidden;
}

.sf-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--sf-cyan) 0%, var(--sf-orange) 100%);
}

/* ------------------------------------------------------------------ 按钮组 */
.sf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 21px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 15px;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .16s var(--sf-ease), background .16s var(--sf-ease), color .16s var(--sf-ease), border-color .16s var(--sf-ease), box-shadow .16s var(--sf-ease);
}

.sf-btn:hover { transform: translateY(-1px); }
.sf-btn:active { transform: translateY(0); }

.sf-btn--primary { background: var(--sf-cyan-2); color: var(--sf-paper); box-shadow: 0 10px 24px rgba(11, 167, 154, .30); }
.sf-btn--primary:hover { background: #0FBBAE; color: var(--sf-paper); }

.sf-btn--accent { background: var(--sf-orange); color: var(--sf-deep); box-shadow: 0 10px 24px rgba(255, 138, 61, .30); }
.sf-btn--accent:hover { background: #FF9A57; color: var(--sf-deep); }

.sf-btn--ghost { background: transparent; border-color: rgba(23, 232, 208, .50); color: var(--sf-paper); }
.sf-btn--ghost:hover { border-color: var(--sf-cyan); background: rgba(23, 232, 208, .12); color: var(--sf-paper); }

.sf-btn--line { background: transparent; border-color: var(--sf-deep-3); color: var(--sf-ink); }
.sf-btn--line:hover { background: var(--sf-deep); border-color: var(--sf-deep); color: var(--sf-paper); }

.sf-btn--sm { padding: 9px 15px; font-size: 14px; }

/* ----------------------------------------------------- 容器 / 分区 / 色彩带 */
.sf-shell {
  width: 100%;
  max-width: var(--sf-shell);
  margin-inline: auto;
  padding-inline: var(--sf-gutter);
}

.sf-shell--narrow { max-width: 840px; }

.sf-top-pad { padding-top: calc(var(--sf-header-h) + clamp(28px, 6vw, 76px)); }

.sf-section { padding-block: clamp(48px, 7vw, 96px); }
.sf-section--tight { padding-block: clamp(28px, 4vw, 56px); }

.sf-band {
  position: relative;
  overflow: hidden;
  background: var(--sf-paper);
  color: var(--sf-ink);
}

.sf-band--deep { background: var(--sf-deep); color: var(--sf-paper); }
.sf-band--deepmid { background: var(--sf-deep-2); color: var(--sf-paper); }
.sf-band--pale { background: var(--sf-cyan-3); color: var(--sf-ink); }
.sf-band--softcyan { background: var(--sf-cyan-soft); color: var(--sf-ink); }
.sf-band--wine { background: var(--sf-wine); color: var(--sf-paper); }
.sf-band--indigo { background: var(--sf-indigo); color: var(--sf-paper); }
.sf-band--accent { background: var(--sf-orange); color: var(--sf-deep); }

.sf-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(100deg, rgba(23, 232, 208, .16) 0 2px, transparent 2px 28px);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
}

/* ---------------------------------------------------------------- 12 栏网格 */
.sf-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.sf-grid > * { min-width: 0; }

.sf-grid--7-5 > *:nth-child(1) { grid-column: span 7; }
.sf-grid--7-5 > *:nth-child(2) { grid-column: span 5; }

.sf-grid--8-4 > *:nth-child(1) { grid-column: span 8; }
.sf-grid--8-4 > *:nth-child(2) { grid-column: span 4; }

.sf-grid--5-4-3 > *:nth-child(1) { grid-column: span 5; }
.sf-grid--5-4-3 > *:nth-child(2) { grid-column: span 4; }
.sf-grid--5-4-3 > *:nth-child(3) { grid-column: span 3; }

@media (max-width: 900px) {
  .sf-grid--7-5 > *:nth-child(n),
  .sf-grid--8-4 > *:nth-child(n),
  .sf-grid--5-4-3 > *:nth-child(n) { grid-column: span 12; }
}

/* -------------------------------------------------------------------- 卡片 */
.sf-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius-m);
  background: var(--sf-paper);
  box-shadow: 0 1px 0 rgba(6, 26, 51, .04);
  transition: transform .18s var(--sf-ease), border-color .18s var(--sf-ease), box-shadow .18s var(--sf-ease);
}

.sf-card:hover { transform: translateY(-2px); border-color: var(--sf-cyan-2); box-shadow: var(--sf-shadow-1); }

.sf-card--deep { background: var(--sf-deep-2); border-color: var(--sf-deep-3); color: var(--sf-paper); }
.sf-card--deep:hover { border-color: var(--sf-cyan); }

.sf-card--accent { background: var(--sf-cyan-3); border-color: #7FE3DA; color: var(--sf-ink); }

.sf-card--link { display: block; }

.sf-card__go {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 15px;
  color: var(--sf-cyan-2);
}

.sf-card__go::after {
  content: "→";
  font-family: var(--sf-font-mono);
  transition: transform .18s var(--sf-ease);
}

.sf-card:hover .sf-card__go::after { transform: translateX(4px); }
.sf-card--deep .sf-card__go { color: var(--sf-cyan); }

/* ------------------------------------------------------ 标题 / 文本 / 标签 */
.sf-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sf-cyan-2);
}

.sf-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: currentColor;
}

.sf-band--deep .sf-eyebrow,
.sf-band--deepmid .sf-eyebrow,
.sf-band--wine .sf-eyebrow,
.sf-band--indigo .sf-eyebrow { color: var(--sf-cyan); }

.sf-eyebrow--orange { color: var(--sf-orange-2); }
.sf-band--deep .sf-eyebrow--orange,
.sf-band--wine .sf-eyebrow--orange,
.sf-band--indigo .sf-eyebrow--orange { color: var(--sf-orange); }

.sf-display { font-size: clamp(52px, 8.4vw, 96px); line-height: .98; letter-spacing: -.035em; }
.sf-h2 { font-size: clamp(28px, 4.2vw, 48px); }
.sf-h3 { font-size: clamp(20px, 2.4vw, 26px); }

.sf-lede {
  max-width: 34em;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: rgba(22, 32, 44, .78);
}

.sf-band--deep .sf-lede,
.sf-band--deepmid .sf-lede,
.sf-band--wine .sf-lede,
.sf-band--indigo .sf-lede { color: rgba(244, 248, 252, .82); }
.sf-band--accent .sf-lede { color: rgba(6, 26, 51, .82); }

.sf-prose { max-width: 36em; }
.sf-prose p { max-width: 34em; margin-bottom: 1em; }
.sf-prose p:last-child { margin-bottom: 0; }

.sf-mono {
  font-family: var(--sf-font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: .03em;
}

.sf-note {
  padding: 16px 20px;
  border-left: 3px solid var(--sf-cyan-2);
  border-radius: 0 var(--sf-radius-s) var(--sf-radius-s) 0;
  background: var(--sf-cyan-3);
  color: var(--sf-ink);
  font-size: 15px;
  line-height: 1.75;
}

.sf-note p { max-width: 34em; }

.sf-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--sf-cyan-3);
  color: var(--sf-ink);
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
}

.sf-tag--orange { background: rgba(255, 138, 61, .16); color: var(--sf-orange-2); border: 1px solid rgba(255, 138, 61, .48); }

/* ------------------------------------------------------------------ 面包屑 */
.sf-breadcrumb { font-size: 13px; }

.sf-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--sf-font-mono);
  letter-spacing: .05em;
}

.sf-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(22, 32, 44, .62);
}

.sf-band--deep .sf-breadcrumb__item,
.sf-band--deepmid .sf-breadcrumb__item,
.sf-band--wine .sf-breadcrumb__item,
.sf-band--indigo .sf-breadcrumb__item { color: rgba(244, 248, 252, .72); }

.sf-breadcrumb__item + .sf-breadcrumb__item::before { content: "/"; color: var(--sf-cyan-2); }

.sf-breadcrumb__link { transition: color .16s var(--sf-ease); }
.sf-breadcrumb__link:hover { color: var(--sf-cyan-2); text-decoration: underline; text-underline-offset: 3px; }
.sf-band--deep .sf-breadcrumb__link:hover { color: var(--sf-cyan); }

/* ------------------------------------------------------------ 图片容器基础 */
.sf-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--sf-radius-organic);
  background: linear-gradient(135deg, var(--sf-deep-2) 0%, var(--sf-deep-3) 100%);
  isolation: isolate;
}

.sf-media > img,
.sf-media > video,
.sf-media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sf-media--wide { aspect-ratio: 16 / 9; }
.sf-media--band { aspect-ratio: 21 / 9; }
.sf-media--square { aspect-ratio: 1 / 1; }
.sf-media--tall { aspect-ratio: 4 / 5; }
.sf-media--deep { border-radius: 56px 20px 20px 20px; }

.sf-media__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(100deg, rgba(6, 26, 51, .52) 0%, rgba(6, 26, 51, 0) 58%),
    repeating-linear-gradient(100deg, rgba(23, 232, 208, .15) 0 2px, transparent 2px 30px);
}

.sf-media__cap {
  margin-top: 10px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(22, 32, 44, .60);
}

.sf-band--deep .sf-media__cap,
.sf-band--deepmid .sf-media__cap,
.sf-band--wine .sf-media__cap,
.sf-band--indigo .sf-media__cap { color: rgba(199, 214, 230, .72); }

/* -------------------------------------------------------- 可展开内容组 */
.sf-acc { display: grid; gap: 12px; }

.sf-acc__item {
  overflow: hidden;
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius-m);
  background: var(--sf-paper);
  transition: border-color .18s var(--sf-ease), box-shadow .18s var(--sf-ease);
}

.sf-acc__item.is-open { border-color: var(--sf-cyan-2); box-shadow: var(--sf-shadow-1); }

.sf-acc__btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px clamp(16px, 2vw, 24px);
  text-align: left;
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--sf-ink);
  cursor: pointer;
}

.sf-acc__btn::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--sf-cyan);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform .18s var(--sf-ease);
}

.sf-acc__item.is-open .sf-acc__btn::before { transform: scaleY(1); }

.sf-acc__num {
  flex: 0 0 auto;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--sf-cyan-2);
}

.sf-acc__item.is-open .sf-acc__num { color: var(--sf-orange-2); }

.sf-acc__label { flex: 1 1 auto; }

.sf-acc__icon {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(23, 232, 208, .16);
  color: var(--sf-cyan-2);
  font-family: var(--sf-font-mono);
  font-size: 14px;
  line-height: 1;
  transition: transform .18s var(--sf-ease), background .18s var(--sf-ease), color .18s var(--sf-ease);
}

.sf-acc__icon::before { content: "→"; }

.sf-acc__item.is-open .sf-acc__icon {
  transform: rotate(90deg);
  background: var(--sf-orange);
  color: var(--sf-deep);
}

.sf-acc__panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .18s var(--sf-ease), opacity .18s var(--sf-ease);
}

.sf-acc__panel[data-open="true"] { opacity: 1; }

.sf-acc__body {
  padding: 0 clamp(16px, 2vw, 24px) 22px 54px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(22, 32, 44, .82);
}

.sf-acc__body p { max-width: 34em; }

/* --------------------------------------------------------- 路径 / 步骤链 */
.sf-path { display: grid; gap: 14px; }

.sf-path__step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 22px;
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius-m);
  background: var(--sf-paper);
  transition: transform .18s var(--sf-ease), border-color .18s var(--sf-ease);
}

.sf-path__step:hover { transform: translateY(-2px); border-color: var(--sf-cyan-2); }

.sf-path__step::after {
  content: "";
  position: absolute;
  left: 34px;
  bottom: -15px;
  width: 2px;
  height: 15px;
  background: linear-gradient(180deg, var(--sf-cyan), rgba(23, 232, 208, 0));
}

.sf-path__step:last-child::after { display: none; }

.sf-path__num {
  display: inline-block;
  padding: 4px 9px;
  border-radius: 8px;
  background: var(--sf-cyan);
  color: var(--sf-deep);
  font-family: var(--sf-font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .04em;
}

.sf-path__title { margin-bottom: 4px; font-family: var(--sf-font-head); font-weight: 800; font-size: 17px; }
.sf-path__desc { max-width: 34em; font-size: 15px; color: rgba(22, 32, 44, .76); }

/* -------------------------------------------------------------- 显现动画 */
.sf-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--sf-ease), transform .5s var(--sf-ease);
}

.sf-js [data-reveal].is-in { opacity: 1; transform: none; }

/* -------------------------------------------------------------- 无障碍工具 */
.sf-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* -------------------------------------------------------------------- 页脚 */
.sf-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--sf-deep);
  color: rgba(244, 248, 252, .84);
}

.sf-footer__trace {
  height: 4px;
  background: linear-gradient(90deg, var(--sf-deep-2) 0%, var(--sf-cyan) 30%, var(--sf-orange) 62%, var(--sf-indigo) 100%);
}

.sf-footer .sf-shell { padding-block: clamp(40px, 6vw, 72px) 26px; }

.sf-footer__top {
  display: grid;
  grid-template-columns: 1.05fr 1.7fr 1.15fr;
  gap: clamp(24px, 4vw, 56px);
}

.sf-footer__name { font-family: var(--sf-font-head); font-weight: 900; font-size: 24px; letter-spacing: -.02em; color: var(--sf-paper); }
.sf-footer__tag { margin-top: 8px; font-weight: 700; color: var(--sf-cyan); }
.sf-footer__out { margin-top: 16px; font-family: var(--sf-font-mono); font-size: 12px; font-weight: 600; letter-spacing: .12em; color: rgba(168, 245, 238, .74); }

.sf-footer__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: clamp(16px, 3vw, 32px);
}

.sf-footer__title {
  margin-bottom: 14px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--sf-orange);
}

.sf-footer__list { display: grid; gap: 10px; }

.sf-footer__link {
  font-size: 15px;
  color: rgba(244, 248, 252, .84);
  text-underline-offset: 4px;
  transition: color .16s var(--sf-ease);
}

.sf-footer__link:hover { color: var(--sf-cyan); text-decoration: underline; }

.sf-footer__item { display: flex; gap: 10px; font-size: 15px; line-height: 1.6; }

.sf-footer__k {
  flex: 0 0 36px;
  padding-top: 3px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--sf-cyan);
}

.sf-footer__v { min-width: 0; color: rgba(244, 248, 252, .86); word-break: break-word; }

.sf-footer__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--sf-orange);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(199, 214, 230, .74);
}

.sf-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 22px;
  border-top: 1px solid rgba(28, 69, 112, .9);
}

.sf-footer__legal { max-width: 52em; font-size: 13px; line-height: 1.7; color: rgba(199, 214, 230, .62); }

.sf-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  font-size: 13px;
  color: rgba(199, 214, 230, .74);
}

.sf-footer__meta .sf-footer__link { font-size: 13px; }

.sf-footer__icp {
  font-family: var(--sf-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .05em;
  color: rgba(168, 245, 238, .82);
}

/* --------------------------------------------------------- 响应式：平板 / 手机 */
@media (max-width: 1080px) {
  .sf-footer__top { grid-template-columns: 1fr 1fr; }
  .sf-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  :root { --sf-header-h: 64px; }

  .sf-navbtn { display: inline-flex; }

  .sf-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 12px var(--sf-gutter) 24px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    background: var(--sf-deep-2);
    border-top: 1px solid var(--sf-deep-3);
    border-bottom: 1px solid var(--sf-deep-3);
    box-shadow: var(--sf-shadow-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .18s var(--sf-ease), transform .18s var(--sf-ease), visibility .18s var(--sf-ease);
  }

  .sf-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .sf-nav__list { flex-direction: column; align-items: stretch; gap: 0; }

  .sf-nav__item { border-bottom: 1px solid rgba(28, 69, 112, .72); }

  .sf-nav__link { justify-content: flex-start; padding: 16px 4px; font-size: 16px; border-radius: 0; }
  .sf-nav__link::after { left: 4px; right: auto; width: 30px; bottom: 6px; }

  .sf-nav__actions { flex-direction: column; align-items: stretch; gap: 12px; margin-top: 18px; }
  .sf-nav__actions .sf-btn { width: 100%; padding: 15px 20px; }

  .sf-footer__top { grid-template-columns: 1fr; gap: 32px; }
  .sf-footer__contact { grid-column: auto; }
}

@media (max-width: 640px) {
  .sf-brand__line { display: none; }
  .sf-brand__mark { width: 34px; height: 34px; border-radius: 11px; }
  .sf-navbtn__text { display: none; }
  .sf-footer__bottom { flex-direction: column; align-items: flex-start; }
  .sf-acc__body { padding-left: 22px; }
}

/* ------------------------------------------------------- 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .sf-js [data-reveal] { opacity: 1; transform: none; }
  .sf-progress__bar { transition: none; }
  .sf-card:hover,
  .sf-path__step:hover,
  .sf-btn:hover { transform: none; }
}