/* =========================================================
   聊球官方版 · 全站共享样式
   文件位置 /assets/site.css
   展览画册式设计系统
   ========================================================= */

/* ---------- 重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #0a1f44;
  --c-accent: #ff6b35;
  --c-cream: #fdf9f2;
  --c-gray: #f0f0f0;
  --c-text: #2f2a25;
  --c-muted: #6b6b6b;
  --c-online: #2e8540;
  --c-warning: #f4b942;
  --c-border: #d8d0c8;
  --c-success-deep: #1e6e3e;

  --font-head: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, sans-serif;

  --fs-h1: 3.5rem;
  --fs-h2: 2.25rem;
  --fs-h3: 1.75rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-micro: 0.75rem;

  --container: 75rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;
  --sp-9: 6.5rem;
  --progress-h: 2px;
}

/* ---------- 基础 ---------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-cream);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-primary);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  font-family: var(--font-body);
  line-height: 1.7;
}

p + p {
  margin-top: 1em;
}

a {
  color: var(--c-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--c-accent);
}

::selection {
  background: var(--c-accent);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

/* ---------- 通用布局 ---------- */
.container {
  width: min(100%, var(--container));
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

#main-content {
  outline: none;
  min-height: 60vh;
}

.page-content {
  padding: var(--sp-8) 0;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  padding: 0.75rem 1.25rem;
  background: var(--c-primary);
  color: #fff;
  font-family: var(--font-head);
  font-size: var(--fs-small);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-100%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: #fff;
  background: var(--c-accent);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-size: var(--fs-small);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

.btn--accent {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

.btn--accent:hover {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}

.btn--sm {
  padding: 0.375rem 0.9rem;
  font-size: var(--fs-micro);
}

.btn--ghost-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.btn--ghost-light:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
  transform: none;
}

/* ---------- 品牌块 ---------- */
.brand {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  text-decoration: none;
  line-height: 1.3;
}

.brand__mark {
  font-family: var(--font-head);
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-primary);
  transition: color 0.2s ease;
}

.brand__mark::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.55rem;
  background: var(--c-accent);
  transform: rotate(45deg);
  vertical-align: 0.1em;
}

a.brand:hover .brand__mark {
  color: var(--c-accent);
}

.brand__tagline {
  font-size: var(--fs-micro);
  font-weight: 400;
  letter-spacing: 0.32em;
  color: var(--c-muted);
  line-height: 1.4;
  white-space: nowrap;
}

.brand--footer .brand__mark {
  color: #fff;
}

.brand--footer .brand__tagline {
  color: rgba(253, 249, 242, 0.6);
}

/* ---------- 页眉 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--c-cream);
}

.site-header__top {
  background: var(--c-primary);
  border-bottom: 1px solid rgba(253, 249, 242, 0.08);
}

.site-header__top-inner {
  width: min(100%, var(--container));
  margin-inline: auto;
  min-height: 2.5rem;
  padding-inline: var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.site-header__notice {
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  color: rgba(253, 249, 242, 0.72);
  line-height: 1.4;
}

.site-header__main {
  position: relative;
  background: var(--c-cream);
}

.site-header__main-inner {
  position: relative;
  width: min(100%, var(--container));
  margin-inline: auto;
  min-height: 5rem;
  padding-inline: var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 5;
  width: 100%;
  height: var(--progress-h);
  background: var(--c-border);
  pointer-events: none;
}

.site-header__progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--c-accent);
  pointer-events: none;
}

/* ---------- 导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav__link {
  position: relative;
  padding: 0.25rem 0;
  font-family: var(--font-head);
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--c-text);
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--c-primary);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"]::after {
  background: var(--c-accent);
}

/* ---------- 导航开关 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  background: transparent;
  border: 1px solid var(--c-border);
  font-family: var(--font-head);
  font-size: var(--fs-micro);
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.nav-toggle__icon {
  position: relative;
  display: inline-block;
  width: 1.125rem;
  height: 0.75rem;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
}

.nav-toggle__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transform: translateY(-50%);
}

.nav-toggle__label--close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__label--open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__label--close {
  display: inline;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: var(--sp-9);
  background: var(--c-primary);
  color: rgba(253, 249, 242, 0.8);
  border-top: 2px solid var(--c-accent);
}

.site-footer__grid {
  width: min(100%, var(--container));
  margin-inline: auto;
  padding: var(--sp-8) var(--sp-5) var(--sp-7);
  display: grid;
  grid-template-columns: 2fr 1fr 1.6fr;
  gap: var(--sp-7);
}

.site-footer__brand {
  min-width: 0;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__blurb {
  margin-top: var(--sp-5);
  max-width: 26rem;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(253, 249, 242, 0.68);
}

.site-footer__heading {
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid rgba(253, 249, 242, 0.15);
  font-family: var(--font-head);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-accent);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.site-footer__list a {
  color: rgba(253, 249, 242, 0.8);
  font-size: var(--fs-small);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--c-accent);
  padding-left: 0.25rem;
}

.site-footer__list--contact li {
  font-size: var(--fs-small);
  line-height: 1.65;
  color: rgba(253, 249, 242, 0.8);
  word-break: break-word;
  overflow-wrap: break-word;
}

.site-footer__note {
  margin-top: var(--sp-4);
  font-size: var(--fs-micro);
  line-height: 1.7;
  color: rgba(253, 249, 242, 0.55);
}

.site-footer__bottom {
  border-top: 1px solid rgba(253, 249, 242, 0.12);
}

.site-footer__bottom-inner {
  width: min(100%, var(--container));
  margin-inline: auto;
  padding: var(--sp-5);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  font-size: var(--fs-micro);
  color: rgba(253, 249, 242, 0.58);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: var(--sp-7);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--c-border);
  font-size: var(--fs-small);
  color: var(--c-muted);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.breadcrumb li + li::before {
  content: "/";
  font-size: var(--fs-micro);
  color: var(--c-border);
}

.breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--c-accent);
}

.breadcrumb li[aria-current="page"] {
  color: var(--c-primary);
  font-weight: 700;
}

/* ---------- 章节 ---------- */
.chapter {
  margin: var(--sp-8) 0;
}

.chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-6);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--c-border);
}

.chapter__number {
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1;
  color: var(--c-primary);
  transition: color 0.3s ease;
}

.chapter__title {
  font-family: var(--font-head);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-primary);
  transition: color 0.3s ease;
}

.chapter__title::after {
  content: "";
  display: block;
  width: 0;
  height: 2px;
  margin-top: 0.5rem;
  background: var(--c-accent);
  transition: width 0.3s ease;
}

.chapter__label {
  margin-left: auto;
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--c-muted);
}

/* ---------- 卡片 ---------- */
.card {
  padding: var(--sp-6);
  background: #fff;
  border: 1px solid var(--c-border);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
  box-shadow: 0 14px 28px rgba(10, 31, 68, 0.08);
}

.card--primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
}

.card--primary h2,
.card--primary h3,
.card--primary p {
  color: rgba(253, 249, 242, 0.86);
}

.card--primary h2,
.card--primary h3 {
  color: #fff;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: var(--sp-6);
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* ---------- 分屏首屏 ---------- */
.split-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-7);
  align-items: stretch;
  min-height: 32rem;
}

.split-hero__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-7) 0;
}

.split-hero__visual {
  position: relative;
  min-height: 18rem;
  border: 1px solid var(--c-border);
  background: var(--c-gray);
  overflow: hidden;
}

/* ---------- 图文错位 ---------- */
.offset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-7);
  align-items: center;
  margin: var(--sp-8) 0;
}

.offset-grid__media,
.offset-grid__text {
  min-width: 0;
}

.offset-grid--flip .offset-grid__media {
  order: -1;
}

/* ---------- 图片占位容器 ---------- */
.image-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--c-gray);
  border: 1px solid var(--c-border);
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(10, 31, 68, 0.12) 55%);
  pointer-events: none;
}

.image-frame::after {
  content: attr(data-caption);
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  padding: 0.25rem 0.5rem;
  background: var(--c-cream);
  font-family: var(--font-head);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-primary);
  visibility: hidden;
}

.image-frame[data-caption]::after {
  visibility: visible;
}

.image-frame--wide {
  aspect-ratio: 16 / 9;
}

.image-frame--tall {
  aspect-ratio: 3 / 4;
}

/* ---------- 注释文字 ---------- */
.note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-head);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--c-muted);
  line-height: 1.4;
}

.note-rotated {
  display: inline-block;
  font-family: var(--font-head);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--c-muted);
  white-space: nowrap;
  transform: rotate(90deg);
  transform-origin: 0 0;
}

/* ---------- 滚动显现与章节高亮 ---------- */
[data-site-js] [data-scroll-section] {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-site-js] [data-scroll-section][data-visible] {
  opacity: 1;
  transform: none;
}

[data-scroll-section][data-active] .chapter__number {
  color: var(--c-accent);
}

[data-scroll-section][data-active] .chapter__title::after {
  width: 2.5rem;
}

/* ---------- 平板（≤1023px） ---------- */
@media (max-width: 1023px) {
  :root {
    --fs-h1: 2.75rem;
    --fs-h2: 1.9rem;
    --fs-h3: 1.5rem;
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6);
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }

  .split-hero {
    grid-template-columns: 1fr;
  }
}

/* ---------- 手机（≤767px） ---------- */
@media (max-width: 767px) {
  .site-header__top-inner {
    min-height: 2.25rem;
    justify-content: flex-end;
  }

  .site-header__notice {
    display: none;
  }

  .site-header__main-inner {
    flex-wrap: wrap;
    min-height: 4rem;
    gap: 0;
  }

  .site-header__main-inner .brand {
    margin-right: auto;
    padding: 0.75rem 0;
  }

  .brand__mark {
    font-size: 1.375rem;
  }

  .brand__tagline {
    font-size: 0.6875rem;
    letter-spacing: 0.18em;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--c-cream);
    border-bottom: 1px solid var(--c-border);
    box-shadow: 0 12px 24px rgba(10, 31, 68, 0.08);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.25s ease, visibility 0s linear 0.35s;
  }

  .site-nav[data-open] {
    max-height: 26rem;
    visibility: visible;
    opacity: 1;
    transition: max-height 0.35s ease, opacity 0.25s ease;
  }

  .site-nav__link {
    display: block;
    padding: 0.95rem var(--sp-5);
    font-size: var(--fs-body);
    border-bottom: 1px solid var(--c-border);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--c-primary);
    color: #fff;
    padding-left: var(--sp-6);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }

  .site-footer__brand {
    grid-column: auto;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .offset-grid {
    grid-template-columns: 1fr;
  }

  .offset-grid--flip .offset-grid__media {
    order: 0;
  }

  .split-hero {
    grid-template-columns: 1fr;
    gap: var(--sp-5);
    min-height: 0;
  }

  .split-hero__content {
    padding: var(--sp-6) 0 0;
  }

  .split-hero__visual {
    aspect-ratio: 16 / 10;
    min-height: 0;
  }

  .chapter {
    margin: var(--sp-7) 0;
  }

  .chapter__label {
    margin-left: 0;
    width: 100%;
  }

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

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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

  [data-site-js] [data-scroll-section] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}