/* ============================================================
   加拿大PC·中文站 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 侧向导览页头 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 01 变量 ---------- */
:root {
  --ink: #0B1524;
  --ink-2: #101E33;
  --cyan: #17C3C9;
  --cyan-deep: #0E7C86;
  --red: #E2452F;
  --red-deep: #B32B18;
  --red-soft: #FF7A5C;
  --lemon: #F5E23C;
  --mist: #F4F7F9;
  --line: #B9D6DC;
  --slate: #5A6B7B;
  --white: #FFFFFF;

  --rail-w: 268px;
  --page-max: 1240px;
  --gutter: 24px;

  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 240ms;
}

/* ---------- 02 Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--ink);
  background: var(--mist);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: var(--cyan-deep); text-decoration: none; }
a:hover { color: var(--red-deep); }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 3px solid var(--lemon);
  outline-offset: 2px;
}

/* ---------- 03 中文排版 ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: inherit;
}
h1 { font-size: clamp(30px, 5.2vw, 54px); line-height: 1.06; }
h2 { font-size: clamp(22px, 3vw, 30px); line-height: 1.25; }
h3 { font-size: clamp(17px, 2.2vw, 21px); line-height: 1.35; }
h4 { font-size: 16px; line-height: 1.4; }

.mono,
code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0.02em;
}

/* ---------- 04 布局骨架 ---------- */
@media (min-width: 1040px) {
  body { padding-left: var(--rail-w); }
}

.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.grid--2,
.grid--3 {
  display: grid;
  gap: var(--gutter);
}
@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 05 图片容器（页面阶段放置占位） ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border: 2px solid var(--line);
}
.media img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--frame {
  border: 3px solid var(--cyan);
  box-shadow: 8px 8px 0 rgba(11, 21, 36, 0.18);
}
.media--ratio {
  aspect-ratio: 16 / 10;
}

/* ---------- 06 面包屑 ---------- */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumbs li + li::before {
  content: "›";
  color: var(--line);
}
.breadcrumbs a { color: var(--cyan-deep); }
.breadcrumbs a:hover { color: var(--red-deep); }
.breadcrumbs [aria-current="page"] { color: var(--slate); }

/* ---------- 07 正文容器 ---------- */
.prose {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}
.prose p {
  margin-bottom: 1.1em;
  max-width: 68ch;
}
.prose h2 { margin: 2em 0 0.6em; }
.prose h3 { margin: 1.6em 0 0.5em; }
.prose ul,
.prose ol { margin: 0 0 1.2em; }
.prose li {
  position: relative;
  padding-left: 1.6em;
  margin-bottom: 0.5em;
  max-width: 68ch;
}
.prose li::before {
  content: "/";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.94em;
  color: var(--cyan);
}
.prose strong { font-weight: 700; }

/* ---------- 08 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.btn:hover {
  color: var(--ink);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink);
}
.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--ink);
}
.btn-signal {
  color: var(--white);
  background: var(--red);
}
.btn-signal:hover {
  color: var(--ink);
  background: var(--red-soft);
}

/* ---------- 09 Skip link ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--lemon);
  border: 2px solid var(--ink);
  transition: top 160ms var(--ease);
}
.skip-link:focus {
  top: 12px;
  color: var(--ink);
}

/* ---------- 10 页头：紧凑命令栏 / 侧向导览轨道 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  color: var(--white);
  background: var(--ink);
  border-bottom: 3px solid var(--cyan);
  overflow: hidden;
}

.rail-aurora {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 12% 112%, rgba(23, 195, 201, 0.30), transparent 62%),
    radial-gradient(90% 70% at 110% -6%, rgba(226, 69, 47, 0.22), transparent 60%);
  animation: railAurora 24s var(--ease) infinite alternate;
}

@keyframes railAurora {
  from { transform: translate3d(-2.5%, -1.5%, 0) scale(1.04); }
  to   { transform: translate3d(2.5%, 1.5%, 0) scale(1.12); }
}

.rail-top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--white);
}
.brand:hover { color: var(--white); }

.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 36px;
  height: 36px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
  background: var(--red);
  border: 2px solid var(--lemon);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.45);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}
.brand-name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand-slogan {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

/* 汉堡按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--white);
  border: 2px solid var(--cyan);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover {
  color: var(--ink);
  background: var(--cyan);
}
.nav-toggle-lines {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 14px;
}
.nav-toggle-lines i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle-lines i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-lines i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-lines i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航 */
.site-nav { position: relative; }

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item { min-width: 0; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.76);
  border-left: 3px solid transparent;
  transition: color var(--dur) var(--ease),
              background var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.nav-link:hover {
  color: var(--white);
  background: rgba(23, 195, 201, 0.14);
  border-left-color: var(--cyan);
}
.nav-link[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  background: var(--cyan);
  border-left-color: var(--lemon);
}
.nav-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.nav-link[aria-current="page"] .nav-index { color: var(--ink-2); }
.nav-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* 轨道底部：状态芯片 + 主行动 + 进度尺 */
.rail-foot {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px 16px 18px;
  border-top: 1px solid rgba(185, 214, 220, 0.2);
}

.status-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--line);
  border: 1px dashed rgba(185, 214, 220, 0.4);
}

.status-dot {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--lemon);
  border-radius: 50%;
  animation: statusPulse 1.8s var(--ease) infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.35; transform: scale(0.68); }
}

.rail-foot .btn-signal {
  width: 100%;
  border-color: var(--lemon);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5);
}
.rail-foot .btn-signal:hover {
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.5);
}

.rail-progress {
  position: relative;
  height: 3px;
  overflow: hidden;
  background: rgba(185, 214, 220, 0.22);
}
.rail-progress-bar {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--lemon));
  transition: transform 140ms linear;
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-size: 18px;
  font-weight: 700;
  color: var(--lemon);
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(11, 21, 36, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover {
  color: var(--ink);
  background: var(--cyan);
}

/* 移动：折叠导航与底部面板 */
@media (max-width: 1039px) {
  .site-nav { display: none; }
  .rail-foot { display: none; }

  .site-header[data-open] .site-nav {
    display: block;
    padding: 6px 10px 14px;
    background: var(--ink-2);
    border-top: 1px solid rgba(185, 214, 220, 0.2);
  }
  .site-header[data-open] .rail-foot {
    display: flex;
    padding: 0 16px 18px;
    background: var(--ink-2);
    border-top: 0;
  }
}

/* 桌面：左轨常驻 */
@media (min-width: 1040px) {
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    padding: 22px 20px 22px;
    border-bottom: 0;
    border-right: 3px solid var(--cyan);
    overflow-x: hidden;
    overflow-y: auto;
  }

  .rail-top { padding: 0; }

  .nav-toggle { display: none; }

  .site-nav { margin-top: 28px; }

  .rail-foot { margin-top: auto; }

  .to-top { right: 28px; bottom: 28px; }
}

/* ---------- 11 页脚 ---------- */
.site-footer {
  position: relative;
  color: var(--white);
  background: var(--ink);
  border-top: 3px solid var(--cyan);
  overflow: hidden;
}

.footer-strip {
  display: block;
  height: 6px;
  background: linear-gradient(90deg,
    var(--cyan) 0 34%,
    var(--lemon) 34% 41%,
    var(--red) 41% 86%,
    var(--cyan-deep) 86% 100%);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 54px var(--gutter) 34px;
}

@media (min-width: 780px) {
  .footer-inner {
    grid-template-columns: 1.05fr 1.45fr;
    gap: 48px;
  }
}

.footer-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.footer-brand {
  margin-top: 10px;
  font-size: clamp(22px, 3.4vw, 28px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.footer-note {
  margin-top: 12px;
  max-width: 40ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.68);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 26px;
}

.footer-col-title {
  margin-bottom: 10px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--lemon);
  border-bottom: 1px solid rgba(185, 214, 220, 0.22);
}

.footer-list li { margin-bottom: 2px; }
.footer-list a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-list a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 18px var(--gutter) 30px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(185, 214, 220, 0.2);
}
.footer-meta-item { margin: 0; }
.footer-service {
  flex-basis: 100%;
  color: rgba(185, 214, 220, 0.72);
}
.footer-copy {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 12 动效与焦点降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .rail-aurora { animation: none; }
  .status-dot { animation: none; }
}