/* ============================================================
   爱赢官网 · 共享样式 /assets/site.css
   墨蓝结构块 + 米白档案纸 + 信号橙索引
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

ol, ul { list-style: none; }

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

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

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

button { background: none; border: 0; cursor: pointer; }

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

hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1B2B;
  --ink-700: #16304A;
  --ink-500: #2C5177;
  --blue-300: #7C9CBC;
  --blue-050: #EAF0F6;
  --paper: #F7F4EE;
  --white: #FFFFFF;
  --signal: #E4631C;
  --signal-deep: #C9520F;
  --signal-050: #FCE9DA;
  --cold: #5F6C7A;
  --line: #D5DBE2;
  --confirm: #1F7A5C;
  --text: #17202A;

  --rail-w: 240px;
  --aside-w: 280px;
  --page-max: 1180px;
  --rail-h: 60px;

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", "Courier New", monospace;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: 140ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; }

h1 { font-size: 28px; }
h2 { font-size: 20px; line-height: 1.35; }
h3 { font-size: 17px; line-height: 1.45; }

p { max-width: 40em; }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.sec-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- 4. 焦点与跳转 ---------- */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: -72px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--signal);
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  border-radius: 2px;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 16px; }

#main-content { scroll-margin-top: 80px; }

/* ---------- 5. 头部：侧边轨道 ---------- */
.site-header {
  position: fixed;
  inset: 0;
  z-index: 80;
  pointer-events: none;
}

.site-header > * { pointer-events: auto; }

.rail {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: var(--rail-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  background: var(--ink-900);
  border-bottom: 1px solid rgba(124, 156, 188, 0.24);
}

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

.brand-name {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.brand-annotation {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--signal);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid rgba(124, 156, 188, 0.42);
  border-radius: 2px;
  color: var(--blue-050);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--signal);
  color: var(--white);
  background: rgba(124, 156, 188, 0.12);
}

.nav-toggle-bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: currentColor;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  position: fixed;
  left: 0;
  right: 0;
  top: var(--rail-h);
  bottom: 0;
  z-index: 79;
  display: flex;
  flex-direction: column;
  padding: 20px 20px 32px;
  background: var(--ink-900);
  border-top: 1px solid rgba(124, 156, 188, 0.24);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 180ms var(--ease), transform 180ms var(--ease), visibility 180ms var(--ease);
}

.site-nav[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (max-width: 1023px) {
  html.is-nav-open { overflow: hidden; }
}

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

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 2px;
  color: var(--blue-300);
  font-size: 15px;
  line-height: 1.5;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-link:hover {
  background: rgba(124, 156, 188, 0.12);
  color: var(--white);
}

.nav-link[aria-current="page"] {
  background: rgba(124, 156, 188, 0.14);
  color: var(--white);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 2px;
  background: var(--signal);
}

.nav-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--blue-300);
  transition: color var(--dur) var(--ease);
}

.nav-link:hover .nav-index { color: var(--blue-050); }
.nav-link[aria-current="page"] .nav-index { color: var(--signal); }

.nav-label { font-weight: 500; }

.nav-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
}

.rail-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.header-meta {
  position: absolute;
  top: 0;
  right: 0;
  display: none;
}

/* 桌面端：轨道竖排 */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .skip-link { left: calc(var(--rail-w) + 24px); }

  .rail {
    left: 0;
    right: auto;
    top: 0;
    bottom: 0;
    width: var(--rail-w);
    height: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 32px 0 18px;
    border-bottom: 0;
    border-right: 1px solid rgba(124, 156, 188, 0.24);
  }

  .brand {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 0 24px 22px;
    border-bottom: 1px solid rgba(124, 156, 188, 0.18);
  }

  .brand-name { font-size: 28px; font-weight: 900; }
  .brand-annotation { font-size: 12px; }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    flex: 1 1 auto;
    min-height: 0;
    padding: 18px 10px 0;
    background: transparent;
    border: 0;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-actions {
    margin-top: auto;
    padding: 0 12px;
  }

  .header-meta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 20px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.02em;
    color: var(--ink-700);
    background: var(--paper);
    border-left: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-bottom-left-radius: 2px;
  }

  .header-meta-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--confirm);
  }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--white);
}

.btn--primary:hover {
  background: var(--signal-deep);
  border-color: var(--signal-deep);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(124, 156, 188, 0.42);
  color: var(--blue-050);
}

.btn--ghost:hover {
  background: rgba(124, 156, 188, 0.12);
  border-color: var(--blue-300);
  color: var(--white);
}

.btn--quiet {
  background: var(--white);
  border-color: var(--line);
  color: var(--ink-700);
}

.btn--quiet:hover {
  border-color: var(--ink-500);
  color: var(--ink-900);
}

/* ---------- 7. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container { padding-left: 40px; padding-right: 40px; }
}

@media (min-width: 1024px) {
  .container { padding-left: 64px; padding-right: 64px; }
}

.grid-2 {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
}

.grid-7-5 {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid-7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

/* ---------- 8. 面包屑与正文 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 24px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cold);
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumbs a { color: var(--ink-500); }
.breadcrumbs a:hover { color: var(--ink-900); }
.breadcrumbs [aria-current="page"] { color: var(--cold); }

.prose { max-width: 38em; }

.prose p { margin-bottom: 24px; }
.prose p:last-child { margin-bottom: 0; }

.prose h2 { margin: 40px 0 16px; }
.prose h3 { margin: 32px 0 12px; }

.prose ul,
.prose ol { margin: 0 0 24px; }

.prose li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
}

.prose li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--cold);
}

.prose strong { font-weight: 700; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.02em;
  color: var(--ink-700);
}

/* ---------- 9. 面板与标签 ---------- */
.panel {
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.panel--ink {
  background: var(--ink-900);
  border-color: var(--ink-700);
  color: var(--blue-050);
}

.panel--blue {
  background: var(--blue-050);
  border-color: var(--line);
}

.panel--signal {
  background: var(--signal-050);
  border-color: #F3D3B8;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--white);
  color: var(--cold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--signal {
  color: var(--signal);
  border-color: #F3D3B8;
  background: var(--signal-050);
}

.tag--confirm {
  color: var(--confirm);
  border-color: #BEDDD1;
  background: #EDF7F3;
}

.tag--ink {
  color: var(--blue-050);
  border-color: var(--ink-500);
  background: rgba(124, 156, 188, 0.14);
}

/* ---------- 10. 图片容器 ---------- */
.figure {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
}

.figure-media {
  position: relative;
  width: 100%;
  aspect-ratio: 7 / 5;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background-color: var(--blue-050);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 32px 32px;
}

.figure-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-media--wide { aspect-ratio: 16 / 9; }
.figure-media--tall { aspect-ratio: 5 / 7; }
.figure-media--square { aspect-ratio: 1 / 1; }

.figure-caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--cold);
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  background: var(--ink-900);
  color: var(--blue-050);
  border-top: 1px solid rgba(124, 156, 188, 0.24);
}

.footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 56px 20px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .footer-inner { padding: 64px 40px 48px; }
}

@media (min-width: 900px) {
  .footer-inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.5fr) minmax(0, 1.1fr);
    gap: 48px;
    padding: 80px 40px 56px;
  }
}

@media (min-width: 1024px) {
  .footer-inner { padding: 80px 64px 56px; }
}

.footer-brand {
  font-size: 28px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--white);
}

.footer-tagline {
  margin-top: 12px;
  max-width: 26em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--blue-300);
}

.footer-version {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.footer-groups {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.footer-group-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--blue-300);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list a {
  display: inline-block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--blue-050);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--white);
  border-bottom-color: var(--blue-300);
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}

.footer-contact-list li {
  display: flex;
  gap: 10px;
  line-height: 1.7;
  color: var(--blue-050);
}

.footer-contact-key {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--blue-300);
}

.footer-contact-note {
  margin-top: 16px;
  max-width: 30em;
  font-size: 13px;
  line-height: 1.75;
  color: var(--blue-300);
}

.footer-base {
  border-top: 1px solid rgba(124, 156, 188, 0.2);
}

.footer-base-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 22px 20px 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

@media (min-width: 768px) {
  .footer-base-inner { padding: 22px 40px 40px; }
}

@media (min-width: 1024px) {
  .footer-base-inner { padding: 24px 64px 44px; }
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--blue-300);
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-legal-links a {
  font-size: 13px;
  color: var(--blue-300);
  transition: color var(--dur) var(--ease);
}

.footer-legal-links a:hover { color: var(--white); }

/* ---------- 12. 减少动效 ---------- */
@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;
  }
}