/* =========================================================
   四季体育 · 共享样式 /assets/site.css
   01 重置与变量  02 排版  03 工具类  04 按钮与标签
   05 内容组件    06 头部  07 页脚  08 全局交互  09 响应式
   ========================================================= */

/* ---------- 01 重置与变量 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

:root {
  --deep: #0E1A24;
  --deep-2: #12222E;
  --paper: #F7F4EC;
  --ink: #101820;
  --spring: #2F9E6E;
  --spring-deep: #1E6E4E;
  --summer: #F26B3A;
  --autumn: #D9A441;
  --winter: #2C5F8A;
  --slate: #8FA3B0;
  --sand: #D8D2C4;

  --line-soft: rgba(143, 163, 176, .18);
  --line-mid: rgba(143, 163, 176, .3);
  --line-strong: rgba(143, 163, 176, .48);
  --paper-line: rgba(16, 24, 32, .14);

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", SimSun, serif;
  --font-mono: "IBM Plex Mono", "DIN Alternate", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step--1: clamp(.78rem, .76rem + .12vw, .875rem);
  --step-0: clamp(1rem, .96rem + .2vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.1rem + .45vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.38rem + 1.1vw, 2.25rem);
  --step-3: clamp(2.1rem, 1.6rem + 2.4vw, 3.5rem);
  --step-display: clamp(96px, 18vw, 240px);

  --gutter: clamp(1rem, 3vw, 2.75rem);
  --wrap: 1240px;
  --radius: 3px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 7.5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-underline-offset: 3px; }
button { font: inherit; color: inherit; background: none; border: 0; }
strong { font-weight: 700; }

::selection { background: var(--summer); color: #141a1f; }

/* ---------- 02 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
}

h1 { font-size: var(--step-3); }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }

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

/* ---------- 03 工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 860px;
}

.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.section__head {
  display: grid;
  gap: .7rem;
  max-width: 48rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.section__index {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--slate);
}

.section__title {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  line-height: 1.16;
}

.section__lede {
  max-width: 40rem;
  font-size: var(--step-0);
  line-height: 1.8;
  opacity: .8;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
}

.grid__col { min-width: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--summer);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.prose {
  max-width: 44rem;
  font-family: var(--font-serif);
  font-size: clamp(1rem, .97rem + .18vw, 1.1rem);
  line-height: 1.95;
}

.prose p + p { margin-top: 1.1em; }

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  margin-top: 1.9em;
  margin-bottom: .6em;
}

/* ---------- 04 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .62rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: .86rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.btn--primary {
  background: var(--summer);
  color: #141a1f;
}

.btn--primary:hover {
  background: #ff8358;
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  background: rgba(247, 244, 236, .1);
  border-color: var(--paper);
}

.btn--sm {
  padding: .4rem .72rem;
  font-size: .74rem;
  letter-spacing: .08em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .24rem .58rem;
  border-radius: 1px;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--spring { background: var(--spring); color: #f7f4ec; }
.tag--summer { background: var(--summer); color: #141a1f; }
.tag--autumn { background: var(--autumn); color: #141a1f; }
.tag--winter { background: var(--winter); color: #f7f4ec; }
.tag--slate  { background: rgba(143, 163, 176, .22); color: var(--paper); }

/* ---------- 05 内容组件 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  background-color: var(--deep);
  background-image:
    linear-gradient(135deg,
      rgba(47, 158, 110, .38) 0%,
      rgba(47, 158, 110, .12) 24%,
      rgba(242, 107, 58, .24) 48%,
      rgba(217, 164, 65, .26) 70%,
      rgba(44, 95, 138, .48) 100%);
  aspect-ratio: 16 / 10;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--slate);
}

.panel {
  overflow: hidden;
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1.1rem;
  border-bottom: 1px solid var(--paper-line);
  background: rgba(216, 210, 196, .42);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
}

.panel__body {
  padding: clamp(1rem, 2vw, 1.4rem);
}

.panel--dark {
  border-color: var(--line-strong);
  background: var(--deep);
  color: var(--paper);
}

.panel--dark .panel__head {
  border-bottom-color: var(--line-soft);
  background: rgba(143, 163, 176, .12);
  color: var(--slate);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: .55rem .7rem;
  text-align: left;
  border-bottom: 1px solid var(--line-mid);
}

.data-table thead th {
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(143, 163, 176, .08);
}

.breadcrumbs {
  padding-block: 1.1rem .25rem;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--slate);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

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

.breadcrumbs__link {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .15s var(--ease), color .15s var(--ease);
}

.breadcrumbs__link:hover {
  color: var(--ink);
  border-bottom-color: var(--summer);
}

/* ---------- 06 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  color: var(--paper);
  background-color: var(--deep);
  background-image: radial-gradient(140% 130% at 82% -50%, rgba(44, 95, 138, .55), transparent 62%);
  border-bottom: 1px solid var(--line-soft);
}

.skip-link {
  position: absolute;
  top: -5rem;
  left: var(--gutter);
  z-index: 120;
  padding: .7rem 1.1rem;
  background: var(--summer);
  color: #141a1f;
  font-family: var(--font-display);
  font-size: .86rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top .16s var(--ease);
}

.skip-link:focus {
  top: .8rem;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 110;
  background: linear-gradient(90deg, var(--spring) 0%, var(--summer) 34%, var(--autumn) 66%, var(--winter) 100%);
  pointer-events: none;
}

.masthead {
  position: relative;
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(.75rem, 2vw, 1.75rem);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.masthead__inner--util {
  justify-content: space-between;
  min-height: 46px;
  padding-block: .5rem;
  border-bottom: 1px solid var(--line-soft);
  font-size: var(--step--1);
}

.masthead__note {
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  line-height: 1.5;
}

.masthead__meta {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex-wrap: wrap;
}

.masthead__inner--main {
  padding-block: .68rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  margin-right: auto;
  text-decoration: none;
  color: var(--paper);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  flex: 0 0 auto;
  border-radius: var(--radius);
  background-image: linear-gradient(135deg,
    var(--spring) 0%, var(--spring) 25%,
    var(--summer) 25%, var(--summer) 50%,
    var(--autumn) 50%, var(--autumn) 75%,
    var(--winter) 75%, var(--winter) 100%);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: .12rem;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: .1em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .26em;
  color: var(--slate);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .5rem .7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--paper);
  cursor: pointer;
  transition: border-color .15s var(--ease), background-color .15s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--paper);
  background: rgba(247, 244, 236, .08);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
}

.nav-toggle__box {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  transform-origin: center;
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.site-header[data-open="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.site-header[data-open="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(.4rem, 1.4vw, 1.6rem);
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: .55rem .2rem;
  color: rgba(247, 244, 236, .78);
  font-family: var(--font-display);
  font-size: .94rem;
  font-weight: 600;
  letter-spacing: .03em;
  text-decoration: none;
  transition: color .16s var(--ease);
}

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

.site-nav__link:hover {
  color: var(--paper);
}

.site-nav__link:hover::after {
  transform: scaleX(1);
}

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

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

/* ---------- 07 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-block: clamp(2.2rem, 5vw, 3.6rem) 1.5rem;
  background-color: var(--deep);
  background-image: radial-gradient(120% 120% at 8% 0%, rgba(30, 110, 78, .45), transparent 58%);
  color: var(--slate);
  border-top: 1px solid var(--line-mid);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.15fr .95fr .9fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.site-footer__zone--contact,
.site-footer__zone--legal {
  padding-left: clamp(0rem, 2vw, 1.6rem);
  border-left: 1px solid var(--line-soft);
}

.footer-title {
  margin-bottom: 1rem;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .22em;
}

.season-legend {
  display: grid;
  gap: .55rem;
}

.season-legend__item {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .84rem;
  line-height: 1.6;
}

.season-legend__dot {
  width: .62rem;
  height: .62rem;
  flex: 0 0 auto;
  border-radius: 1px;
}

.season-legend__dot--spring { background: var(--spring); }
.season-legend__dot--summer { background: var(--summer); }
.season-legend__dot--autumn { background: var(--autumn); }
.season-legend__dot--winter { background: var(--winter); }

.season-legend__text { color: rgba(247, 244, 236, .8); }

.footer-nav {
  margin-top: 1.4rem;
}

.footer-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem 1.1rem;
}

.footer-nav__link {
  font-size: .86rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}

.footer-nav__link:hover {
  color: var(--paper);
  border-bottom-color: var(--summer);
}

.footer-contact {
  display: grid;
  gap: .75rem;
  font-size: .85rem;
  line-height: 1.65;
}

.footer-contact__item {
  display: grid;
  gap: .12rem;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .18em;
  color: rgba(143, 163, 176, .75);
}

.footer-contact__value {
  color: rgba(247, 244, 236, .88);
  word-break: break-word;
}

.footer-legal {
  display: grid;
  gap: .65rem;
  font-size: .82rem;
  line-height: 1.7;
}

.footer-legal__brand {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .05em;
}

.footer-legal__note {
  color: rgba(143, 163, 176, .85);
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.1rem;
}

.footer-legal__link {
  color: rgba(247, 244, 236, .88);
  font-size: .84rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line-mid);
  transition: color .15s var(--ease), border-color .15s var(--ease);
}

.footer-legal__link:hover {
  color: var(--paper);
  border-bottom-color: var(--autumn);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .4rem 1.5rem;
  width: 100%;
  max-width: var(--wrap);
  margin: clamp(1.6rem, 4vw, 2.6rem) auto 0;
  padding: 1.1rem var(--gutter) 0;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: rgba(143, 163, 176, .85);
}

.site-footer__copy,
.site-footer__record {
  margin: 0;
}

/* ---------- 08 全局交互 ---------- */
.to-top {
  position: fixed;
  right: clamp(.8rem, 2vw, 1.6rem);
  bottom: clamp(.8rem, 2vw, 1.6rem);
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem .9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--deep);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s var(--ease), border-color .2s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  border-color: var(--summer);
}

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

html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}

html[data-reveal-ready] [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 09 响应式 ---------- */
@media (max-width: 1080px) {
  .site-nav__link { font-size: .88rem; }
  .masthead__note { letter-spacing: .08em; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 5rem; }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    order: 3;
    flex-basis: 100%;
  }

  .site-header[data-open="true"] .site-nav {
    display: block;
  }

  .masthead__inner--main {
    flex-wrap: wrap;
    padding-block: .7rem;
  }

  .masthead__inner--util {
    display: none;
  }

  .site-header[data-open="true"] .masthead__inner--util {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: .7rem;
    padding-block: .85rem;
  }

  .masthead__meta { gap: .5rem; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: .35rem 1rem;
  }

  .site-nav__item {
    border-top: 1px solid var(--line-soft);
  }

  .site-nav__link {
    display: block;
    padding: .8rem .15rem;
    font-size: 1rem;
  }

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

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

  .grid--split { grid-template-columns: minmax(0, 1fr); }

  .site-footer__inner { grid-template-columns: 1fr 1fr; }

  .site-footer__zone--legal {
    grid-column: 1 / -1;
    padding-left: 0;
    border-left: 0;
    padding-top: 1.3rem;
    border-top: 1px solid var(--line-soft);
  }
}

@media (max-width: 620px) {
  .brand__mark { width: 2.3rem; height: 2.3rem; font-size: .82rem; }
  .brand__name { font-size: 1.05rem; }
  .masthead__note { font-size: .68rem; }

  .site-footer__inner { grid-template-columns: 1fr; }

  .site-footer__zone--contact {
    padding-left: 0;
    border-left: 0;
    padding-top: 1.3rem;
    border-top: 1px solid var(--line-soft);
  }

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

  .to-top { font-size: .68rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  html[data-reveal-ready] [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .to-top {
    transform: none;
  }
}