/* ==========================================================================
   必胜28指南 · 共享样式表 /assets/site.css
   设计逻辑：左侧常驻版本轨道 + 纸感叠层 + 等宽编号路标
   热入口（赭红/暖金）— 冷阅读（青灰/纸白）
   ========================================================================== */

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

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

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

ul, ol { padding: 0; }

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

a { color: inherit; }

button { font: inherit; }

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid var(--cobalt);
  outline-offset: 3px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩体系 */
  --ochre: #9C3B2E;      /* 赭红：栏头、主入口、主按钮 */
  --cobalt: #1F4E79;     /* 钴蓝：导航、链接、章节编号 */
  --copper: #8A5A2B;     /* 铜褐：描边、时间轴、注释 */
  --moon: #F4EFE4;       /* 扎染月白：主背景 */
  --gold: #D9A441;       /* 暖金：权益区强调 */
  --slate: #7B8A84;      /* 青灰：版本库底纹、次级信息 */
  --ink: #1E2422;        /* 深墨：正文 */
  --paper: #FBF8F1;      /* 纸白：卡片与面板 */
  --mist: #E3E8E3;       /* 浅青灰：对照区底 */
  --spark: #F2C14E;      /* 高亮金：状态点、细线 */
  --maroon: #5E2A22;     /* 深红棕：按下态、页脚 */

  /* 尺寸与节奏 */
  --rail-w: 248px;
  --topbar-h: 64px;
  --page-max: 1240px;
  --gutter: clamp(18px, 4vw, 56px);
  --line: rgba(138, 90, 43, 0.32);
  --line-cool: rgba(123, 138, 132, 0.42);

  /* 字体 */
  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Noto Sans Mono", monospace;

  /* 动效 */
  --ease: 200ms cubic-bezier(0.32, 0.72, 0.32, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--moon);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(16px, 0.5vw + 14.4px, 17.5px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (max-width: 1023px) {
  body { padding-block-start: var(--topbar-h); }
}

@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 4.6vw, 68px); }
h2 { font-size: clamp(24px, 2.6vw, 40px); }
h3 { font-size: clamp(19px, 1.6vw, 25px); }
h4 { font-size: 17px; }

p { text-wrap: pretty; }

strong { font-weight: 700; }

/* ---------- 4. 跳过链接与阅读进度 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 10px;
  inset-inline-start: 10px;
  z-index: 300;
  padding: 11px 18px;
  background-color: var(--cobalt);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: 1px;
  transform: translateY(-180%);
  transition: transform var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
}

.read-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 3px;
  z-index: 250;
  background-color: rgba(123, 138, 132, 0.22);
  pointer-events: none;
}

.read-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background-image: linear-gradient(90deg, var(--ochre), var(--gold) 62%, var(--spark));
  transition: width 120ms linear;
}

/* ---------- 5. 头部：桌面左轨道 / 移动顶栏 ---------- */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: var(--topbar-h);
  z-index: 70;
  background-color: var(--moon);
  border-block-end: 2px solid var(--ochre);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 100%;
  padding-inline: var(--gutter);
}

/* 品牌锁定 */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--ink);
  min-width: 0;
}

.brand__mark {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background-color: var(--ochre);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 3px 3px 0 rgba(138, 90, 43, 0.35);
  transition: box-shadow var(--ease), background-color var(--ease);
}

.brand:hover .brand__mark {
  background-color: var(--maroon);
  box-shadow: 1px 1px 0 rgba(138, 90, 43, 0.45);
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.15;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand__sub {
  display: block;
  margin-block-start: 5px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--cobalt);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 移动端抽屉按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  background-color: var(--ochre);
  color: var(--paper);
  border: 1px solid var(--maroon);
  border-radius: 1px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1;
  transition: background-color var(--ease), border-color var(--ease);
}

.nav-toggle:hover { background-color: var(--maroon); }

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: currentColor;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-toggle__label { white-space: nowrap; }

/* 导航本体：移动端为抽屉 */
.site-nav {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  width: min(84vw, 330px);
  max-height: 100vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  padding: 26px 22px 30px;
  background-color: var(--paper);
  border-inline-end: 1px solid var(--line);
  box-shadow: 20px 0 44px rgba(30, 36, 34, 0.3);
  z-index: 90;
  transform: translateX(-104%);
  visibility: hidden;
  transition: transform 220ms cubic-bezier(0.32, 0.72, 0.32, 1), visibility 220ms;
}

.site-nav[data-open="true"] {
  transform: translateX(0);
  visibility: visible;
}

.site-nav__kicker {
  margin-block-end: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.6;
  color: var(--copper);
}

.site-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 10px 10px 9px;
  text-decoration: none;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  border-inline-start: 3px solid transparent;
  border-radius: 0 1px 1px 0;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--slate);
  font-variant-numeric: tabular-nums;
  transition: color var(--ease);
}

.site-nav__label { line-height: 1.4; }

.site-nav__link:hover,
.site-nav__link:focus-visible {
  background-color: rgba(31, 78, 121, 0.08);
  border-inline-start-color: var(--copper);
  color: var(--cobalt);
}

.site-nav__link[aria-current="page"] {
  background-color: rgba(31, 78, 121, 0.11);
  border-inline-start-color: var(--ochre);
  color: var(--cobalt);
  font-weight: 700;
}

.site-nav__link[aria-current="page"] .site-nav__num {
  color: var(--ochre);
}

.site-nav__cta {
  margin-block-start: 26px;
  align-self: flex-start;
}

.site-nav__foot {
  margin-block-start: auto;
  padding-block-start: 26px;
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* 遮罩：必须写在 .site-nav 之后 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 80;
  background-color: rgba(30, 36, 34, 0.52);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ease), visibility var(--ease);
}

.site-nav[data-open="true"] ~ .nav-scrim {
  opacity: 1;
  visibility: visible;
}

/* 桌面端：左侧常驻轨道 */
@media (min-width: 1024px) {
  .site-header {
    inset-inline: auto;
    inset-block-start: 0;
    inset-inline-start: 0;
    width: var(--rail-w);
    height: 100vh;
    height: 100dvh;
    border-block-end: 0;
    background-image: linear-gradient(180deg, var(--paper) 0%, var(--moon) 56%, var(--mist) 100%);
  }

  /* 铜器刻度：轨道右缘 */
  .site-header::after {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-end: 0;
    width: 1px;
    background-image: repeating-linear-gradient(
      180deg,
      var(--copper) 0 2px,
      transparent 2px 11px
    );
    opacity: 0.55;
  }

  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    height: 100%;
    padding: 30px 24px 22px;
    gap: 0;
  }

  .brand { gap: 10px; }

  .brand__name { font-size: 19px; }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    transform: none;
    visibility: visible;
    width: auto;
    max-height: none;
    overflow: visible;
    flex: 1 1 auto;
    padding: 0;
    background-color: transparent;
    border: 0;
    box-shadow: none;
    margin-block-start: 4px;
  }

  .site-nav__kicker {
    margin-block: 26px 10px;
  }

  .site-nav__cta { margin-block-start: 24px; }

  .nav-scrim { display: none; }
}

/* ---------- 6. 页脚：深红棕收束 ---------- */
.site-footer {
  position: relative;
  margin-block-start: clamp(48px, 8vw, 120px);
  background-color: var(--maroon);
  color: #F1E7DA;
  border-block-start: 5px solid var(--gold);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 4px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--spark) 0 16px,
    transparent 16px 32px
  );
  opacity: 0.55;
  pointer-events: none;
}

.site-footer__inner {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: clamp(38px, 6vw, 74px) var(--gutter) clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.site-footer__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.site-footer__tag {
  margin-block: 10px 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--spark);
}

.site-footer__note {
  font-size: 13px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.72);
  max-width: 34ch;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--spark);
  margin-block-end: 16px;
}

.site-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.site-footer__list a {
  color: #F1E7DA;
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  border-block-end: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.site-footer__list a:hover,
.site-footer__list a:focus-visible {
  color: var(--spark);
  border-block-end-color: var(--spark);
}

.site-footer__list a[aria-current="page"] {
  color: var(--spark);
  border-block-end-color: rgba(242, 193, 78, 0.6);
}

.site-footer__contact {
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.86);
  max-width: 40ch;
}

.site-footer__contact span { display: block; }

.site-footer__contact span + span { margin-block-start: 6px; }

.site-footer__contact span:last-child {
  margin-block-start: 12px;
  font-size: 12.5px;
  color: rgba(244, 239, 228, 0.62);
}

.site-footer__base {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 16px var(--gutter) 30px;
  border-block-start: 1px solid rgba(244, 239, 228, 0.18);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(244, 239, 228, 0.6);
}

.site-footer__base p { margin: 0; }

.site-footer__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: rgba(244, 239, 228, 0.78);
}

.site-footer :focus-visible {
  outline-color: var(--spark);
}

@media (min-width: 760px) {
  .site-footer__inner {
    grid-template-columns: 1.3fr 0.85fr 0.85fr;
  }
  .site-footer__col--contact { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: 1.4fr 0.8fr 0.8fr 1.2fr;
  }
  .site-footer__col--contact { grid-column: auto; }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 1px;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}

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

.btn:active { transform: translateY(0); }

.btn--entry {
  background-color: var(--ochre);
  color: var(--paper);
  border-color: var(--ochre);
  box-shadow: 4px 4px 0 rgba(94, 42, 34, 0.24);
}

.btn--entry:hover {
  background-color: var(--maroon);
  border-color: var(--maroon);
  color: var(--paper);
}

.btn--ghost {
  background-color: transparent;
  color: var(--cobalt);
  border-color: var(--copper);
}

.btn--ghost:hover {
  background-color: rgba(31, 78, 121, 0.08);
  border-color: var(--cobalt);
}

.btn--gold {
  background-color: var(--gold);
  color: var(--ink);
  border-color: var(--maroon);
}

.btn--gold:hover {
  background-color: var(--spark);
  color: var(--ink);
}

/* ---------- 8. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: 68ch;
}

.prose > * + * {
  margin-block-start: 1.05em;
}

.prose h2 { margin-block-start: 1.9em; }
.prose h3 { margin-block-start: 1.6em; }
.prose ul, .prose ol { padding-inline-start: 1.3em; }
.prose li + li { margin-block-start: 0.4em; }

.prose a {
  color: var(--cobalt);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(31, 78, 121, 0.4);
}

.prose a:hover { text-decoration-color: var(--cobalt); }

.section {
  padding-block: clamp(30px, 5.5vw, 76px);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lede {
  font-size: clamp(16.5px, 1.2vw, 20px);
  line-height: 1.85;
  color: rgba(30, 36, 34, 0.82);
  max-width: 56ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  line-height: 1.4;
  text-transform: uppercase;
  color: var(--cobalt);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background-color: var(--ochre);
  flex: 0 0 auto;
}

.rule {
  height: 0;
  border: 0;
  border-block-start: 1px solid var(--line);
  margin-block: clamp(22px, 4vw, 46px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--halves {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

.grid--thirds {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

/* ---------- 9. 面板 / 标签 / 编号 ---------- */
.panel {
  position: relative;
  padding: clamp(17px, 2.4vw, 30px);
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1px;
}

.panel--stack {
  box-shadow: 7px 7px 0 rgba(123, 138, 132, 0.26);
}

.panel--cool {
  background-color: var(--mist);
  border-color: var(--line-cool);
}

.panel--gold {
  background-color: var(--gold);
  border-color: var(--maroon);
  color: var(--ink);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  text-decoration: none;
  color: var(--copper);
  border: 1px solid currentColor;
  border-radius: 1px;
  white-space: nowrap;
}

.tag--gold {
  background-color: var(--spark);
  color: var(--maroon);
  border-color: var(--maroon);
}

.tag--cool {
  background-color: rgba(227, 232, 227, 0.7);
  color: var(--cobalt);
  border-color: var(--cobalt);
}

.num {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 10. 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.crumbs li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--copper);
}

.crumbs a {
  color: var(--cobalt);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.crumbs a:hover { border-block-end-color: var(--cobalt); }

.crumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 11. 图片容器（供页面阶段使用） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background-color: var(--mist);
  border: 1px solid var(--line);
  border-radius: 1px;
}

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

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__ph {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 14px;
  text-align: center;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(135deg, rgba(123, 138, 132, 0.18) 0 6px, transparent 6px 15px),
    repeating-linear-gradient(45deg, rgba(138, 90, 43, 0.1) 0 2px, transparent 2px 11px);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.media__caption {
  display: block;
  margin-block-start: 10px;
  padding-inline-start: 10px;
  border-inline-start: 2px solid var(--gold);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--copper);
}

/* ---------- 12. 进入视口显现 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(9px);
  transition: opacity 380ms ease, transform 380ms ease;
}

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

/* ---------- 13. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .btn:active { transform: none; }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .site-nav[data-open="true"] ~ .nav-scrim { opacity: 1; }
}

/* ---------- 14. 平板微调 ---------- */
@media (min-width: 640px) and (max-width: 1023px) {
  .site-header__inner { padding-inline: clamp(20px, 4vw, 32px); }
  .brand__name { font-size: 19px; }
}