/* =========================================================
   顺发游艺 · 共享样式 /assets/site.css
   头尾外壳 + 令牌 + 通用组件（页面特色布局由页面 CSS 接管）
   ========================================================= */

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

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

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

/* ---------- tokens ---------- */
:root {
  --c-orange: #F26522;
  --c-orange-deep: #C9480F;
  --c-sand: #FFB03A;
  --c-neon: #FFD966;
  --c-night: #0E1B3D;
  --c-indy: #1B3A8C;
  --c-jade: #0E9E76;
  --c-dusk: #FFE8CE;
  --c-paper: #F7F4EE;
  --c-graphite: #5A6270;
  --c-white: #FFFFFF;

  --c-line: rgba(14, 27, 61, .12);
  --c-line-strong: rgba(14, 27, 61, .26);
  --c-on-night: rgba(247, 244, 238, .78);
  --c-on-night-soft: rgba(247, 244, 238, .56);

  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --radius-lg: 32px;
  --radius-md: 24px;
  --radius-sm: 14px;
  --radius-pill: 999px;

  --header-h: 78px;
  --gutter: clamp(20px, 4vw, 64px);
  --maxw: 1280px;
  --section-gap: clamp(56px, 7vw, 88px);

  --shadow-soft: 0 22px 44px -32px rgba(14, 27, 61, .5);
  --shadow-lift: 0 26px 52px -30px rgba(14, 27, 61, .62);
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- base ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-night);
  background-color: var(--c-paper);
  background-image: radial-gradient(rgba(14, 27, 61, .06) 1px, transparent 1px);
  background-size: 18px 18px;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
}

p { max-width: 72ch; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: .94em;
  letter-spacing: .04em;
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: var(--c-sand); color: var(--c-night); }

section[id], article[id], div[id] { scroll-margin-top: calc(var(--header-h) + 18px); }

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 880px; }

.section { padding-block: var(--section-gap); }
.section--tight { padding-block: clamp(32px, 4vw, 56px); }

.section--dusk { background: var(--c-dusk); }

.section--night {
  background: var(--c-night);
  color: var(--c-paper);
  border-radius: var(--radius-lg);
}

.section--night .section-title { color: var(--c-paper); }
.section--night .lead { color: var(--c-on-night); }

.stack { display: grid; gap: 18px; }
.stack--lg { gap: clamp(28px, 3.4vw, 44px); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--asym-rev { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--c-sand), rgba(255, 176, 58, 0));
}

/* ---------- typography helpers ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-orange-deep);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-sand);
}

.section--night .eyebrow { color: var(--c-neon); }

.section-title {
  font-size: clamp(26px, 3.4vw, 46px);
  transform: skewX(-3deg);
  transform-origin: left center;
  color: var(--c-night);
}

.lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: var(--c-graphite);
  max-width: 60ch;
}

.prose {
  display: grid;
  gap: 20px;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.75;
}

.prose h2 { font-size: clamp(22px, 2.4vw, 30px); }

.prose a {
  color: var(--c-indy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--c-orange-deep); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  transition: transform .2s var(--ease), background-color .2s var(--ease),
              color .2s var(--ease), box-shadow .2s var(--ease);
}

.btn--cta {
  background: var(--c-orange-deep);
  color: var(--c-white);
  box-shadow: 0 14px 26px -14px rgba(201, 72, 15, .95);
}

.btn--cta:hover {
  background: #B03F0C;
  transform: rotate(-1.5deg) translateY(-1px);
}

.btn--cta:active { transform: scale(.98); }

.btn--sand {
  background: var(--c-sand);
  color: var(--c-night);
}

.btn--sand:hover { background: var(--c-neon); transform: rotate(-1.5deg); }
.btn--sand:active { transform: scale(.98); }

.btn--ghost {
  background: transparent;
  color: var(--c-night);
  border: 1.5px solid var(--c-line-strong);
}

.btn--ghost:hover {
  border-color: var(--c-orange);
  color: var(--c-orange-deep);
  transform: rotate(-1.5deg);
}

.btn.is-done {
  background: var(--c-jade);
  color: var(--c-white);
  border-color: transparent;
}

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .04em;
  background: var(--c-dusk);
  color: var(--c-orange-deep);
  white-space: nowrap;
}

.tag--jade { background: rgba(14, 158, 118, .15); color: #0A6F55; }
.tag--sand { background: rgba(255, 176, 58, .24); color: #8A5400; }
.tag--night { background: var(--c-night); color: var(--c-neon); }

/* ---------- cards（专题研究板） ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--c-white);
  border: 1px solid rgba(14, 27, 61, .06);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}

.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }

.card--dusk { background: var(--c-dusk); }
.card--night { background: var(--c-night); color: var(--c-paper); border-color: transparent; }
.card--night .card__meta { color: var(--c-on-night-soft); }

.card__title {
  font-size: 22px;
  line-height: 1.3;
  color: inherit;
}

.card--night .card__title { color: var(--c-paper); }

.card__body {
  font-size: 16px;
  line-height: 1.75;
  color: inherit;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-graphite);
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 20px 0;
  font-size: 14px;
  color: var(--c-graphite);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb__item a:hover {
  color: var(--c-orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- media frame（页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--c-orange) 0%, var(--c-sand) 46%, var(--c-indy) 100%);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .55) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: .12;
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-graphite);
}

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.reveal.is-visible { opacity: 1; transform: none; }

/* =========================================================
   头部
   ========================================================= */
.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--c-night);
  color: var(--c-neon);
  font-weight: 700;
  transition: top .2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(247, 244, 238, .94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(14, 27, 61, .10);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease),
              border-color .3s var(--ease);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
  transition: min-height .3s var(--ease);
}

.site-header.is-scrolled {
  background: var(--c-dusk);
  border-bottom-color: rgba(14, 27, 61, .16);
  box-shadow: 0 16px 34px -26px rgba(14, 27, 61, .8);
}

.site-header.is-scrolled .site-header__inner { min-height: 64px; }

/* 品牌 */
.site-header__brand { display: flex; align-items: center; flex: 0 0 auto; }

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 16px 5px 16px 5px;
  background: linear-gradient(135deg, var(--c-orange) 0%, var(--c-sand) 100%);
  color: var(--c-white);
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  transform: skewX(-6deg);
  box-shadow: 0 12px 22px -12px rgba(242, 101, 34, .95);
}

.site-brand__text { display: flex; flex-direction: column; line-height: 1.16; }

.site-brand__name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-night);
  transform: skewX(-3deg);
  transform-origin: left center;
}

.site-brand__tag {
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--c-graphite);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.2vw, 14px);
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .7vw, 8px);
}

.site-nav__link {
  display: inline-block;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--c-night);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.site-nav__link:hover {
  background: rgba(242, 101, 34, .14);
  color: var(--c-orange-deep);
}

.site-nav__link[aria-current="page"] {
  background: var(--c-night);
  color: var(--c-neon);
  font-weight: 700;
}

.site-nav__cta { margin-left: clamp(8px, 1.6vw, 18px); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 10px 17px;
  border-radius: var(--radius-pill);
  background: var(--c-night);
  color: var(--c-dusk);
  font-size: 14px;
  font-weight: 700;
}

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

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), opacity .2s 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); }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(90deg, var(--c-orange-deep), var(--c-sand) 55%, var(--c-neon));
  transition: width .12s linear;
}

/* 首屏封面页的透明叠加态 */
body[data-hero] .site-header:not(.is-scrolled) {
  background: transparent;
  border-bottom-color: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

body[data-hero] .site-header:not(.is-scrolled) .site-brand__name { color: var(--c-white); }
body[data-hero] .site-header:not(.is-scrolled) .site-brand__tag { color: rgba(255, 232, 206, .82); }
body[data-hero] .site-header:not(.is-scrolled) .site-nav__link { color: rgba(255, 232, 206, .92); }
body[data-hero] .site-header:not(.is-scrolled) .site-nav__link:hover {
  background: rgba(255, 217, 102, .18);
  color: var(--c-neon);
}
body[data-hero] .site-header:not(.is-scrolled) .site-nav__link[aria-current="page"] {
  background: rgba(255, 232, 206, .18);
  color: var(--c-neon);
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: var(--section-gap);
  background: var(--c-night);
  color: var(--c-paper);
  overflow: hidden;
}

.site-footer__ribbon {
  height: 26px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-sand) 30%, var(--c-indy) 68%, var(--c-night) 100%);
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  margin-bottom: clamp(34px, 5vw, 62px);
}

.site-footer__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.05fr) minmax(0, .9fr);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-bottom: clamp(38px, 5vw, 64px);
}

.site-footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-sand);
}

.site-footer__title--gap { margin-top: 30px; }

.site-footer__links { display: grid; gap: 10px; }

.site-footer__links a {
  font-size: 15px;
  color: rgba(247, 244, 238, .82);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.site-footer__links a:hover { color: var(--c-neon); padding-left: 5px; }

.site-footer__contact { display: grid; gap: 14px; }

.site-footer__item { display: grid; gap: 3px; }

.site-footer__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-on-night-soft);
}

.site-footer__value {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(247, 244, 238, .92);
  overflow-wrap: anywhere;
}

.site-footer__value--mono { font-family: var(--font-mono); letter-spacing: .04em; }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 20px;
  font-size: 13.5px;
  color: var(--c-on-night-soft);
}

.site-footer__legal a {
  color: rgba(247, 244, 238, .78);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .2s var(--ease);
}

.site-footer__legal a:hover { color: var(--c-neon); }

.site-footer__brand {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-sand);
}

.site-footer__slogan {
  margin-top: 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 900;
  line-height: 1.35;
  color: var(--c-paper);
  transform: skewX(-3deg);
  transform-origin: left center;
  max-width: 18ch;
}

.site-footer__note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-on-night-soft);
  max-width: 30ch;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 20px var(--gutter) 28px;
  border-top: 1px solid rgba(247, 244, 238, .14);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-on-night-soft);
}

.site-footer__base p { max-width: none; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__inner { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
  .site-footer__col--note { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --header-h: 68px; }

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

  .site-nav {
    position: absolute;
    left: var(--gutter);
    right: var(--gutter);
    top: calc(100% + 10px);
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    margin-left: 0;
    padding: 16px;
    border-radius: var(--radius-md);
    background: var(--c-paper);
    border: 1px solid var(--c-line);
    box-shadow: 0 28px 52px -30px rgba(14, 27, 61, .72);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }

  .site-nav__link {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--c-night);
  }

  .site-nav__cta { margin: 10px 0 0; width: 100%; }

  .grid--2,
  .grid--3,
  .grid--asym,
  .grid--asym-rev { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  body { font-size: 16.5px; }

  .site-brand__tag { display: none; }
  .site-brand__mark { width: 40px; height: 40px; border-radius: 14px 4px 14px 4px; }

  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__col--note { grid-column: auto; }
  .site-footer__base { flex-direction: column; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .reveal { opacity: 1 !important; transform: none !important; }
  .card:hover { transform: none; }
  .btn:hover { transform: none; }
  .site-footer__links a:hover { padding-left: 0; }
}