/* ==========================================================================
   华体服务 · 共享样式表 /assets/site.css
   冰蓝框架 + 蓝图坐标 + 暖纸档案 · 技术蓝图式粗野主义
   ========================================================================== */

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

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

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

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

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

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

a { color: inherit; }

[hidden] { display: none !important; }

/* ---------- tokens ---------- */
:root {
  --ice: #8FD8FF;
  --ice-soft: rgba(143, 216, 255, 0.18);
  --snow: #F7FBFF;
  --space: #0A1B2E;
  --orange: #FF6B2C;
  --orange-soft: #FFB38A;
  --aurora: #5EEAD4;
  --char: #2B3440;
  --paper: #F3EDE1;
  --silver: #C7D7E5;
  --deepice: #0E3A5D;
  --grid-line: rgba(14, 58, 93, 0.07);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --maxw: 1320px;
  --bw: 3px;
  --shadow-hard: 6px 6px 0 var(--space);
  --shadow-soft: 6px 6px 0 var(--silver);
}

/* ---------- base ---------- */
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--char);
  background-color: var(--snow);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: 0.06em;
  color: var(--space);
}

h1 { font-size: clamp(2.4rem, 5vw, 4.8rem); letter-spacing: 0.05em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
h3 { font-size: 1.25rem; letter-spacing: 0.08em; }
h4 { font-size: 1.0625rem; letter-spacing: 0.08em; }

p { line-height: 1.75; }

strong { font-weight: 800; color: var(--space); }

::selection { background: var(--orange); color: var(--snow); }

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

#main-content { display: block; scroll-margin-top: 7rem; }

/* ---------- layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2.25rem);
}

.section { padding-block: clamp(2.5rem, 5vw, 4.5rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--deepice);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--orange);
}

.section__title { margin-top: 0.5rem; }

.section__note {
  max-width: 64ch;
  margin-top: 0.75rem;
  color: var(--char);
}

.grid { display: grid; gap: clamp(1rem, 2.5vw, 2rem); }
.grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--space);
  text-decoration: none;
  background: var(--snow);
  border: 2px solid var(--space);
  box-shadow: 3px 3px 0 var(--space);
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--space);
}

.btn:active {
  transform: translate(3px, 3px);
  box-shadow: 0 0 0 var(--space);
}

.btn--accent { background: var(--orange); color: var(--space); }
.btn--accent:hover { background: var(--orange-soft); }

.btn--block {
  display: flex;
  width: 100%;
  margin-top: 1.25rem;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 120;
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--space);
  text-decoration: none;
  background: var(--orange);
  border: 2px solid var(--space);
  box-shadow: 4px 4px 0 var(--space);
  transform: translateY(-220%);
  transition: transform 0.18s ease;
}

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

/* ---------- header frame ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: var(--snow);
  border-bottom: var(--bw) solid var(--space);
}

.frame-rule {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1.25rem;
  padding: 0.45rem clamp(1rem, 3vw, 2.25rem);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ice);
  background: var(--space);
}

.frame-rule__id { color: var(--ice); }

.frame-rule__meta {
  display: inline-flex;
  align-items: center;
  color: var(--snow);
}

.frame-rule__dot {
  width: 8px;
  height: 8px;
  margin-right: 0.5rem;
  background: var(--aurora);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(94, 234, 212, 0.22);
}

.frame-rule__sync { color: var(--aurora); }

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.6rem 1.25rem;
  padding: clamp(0.9rem, 2vw, 1.35rem) clamp(1rem, 3vw, 2.25rem);
  border-bottom: 1px solid var(--silver);
}

.masthead > .brand { grid-column: 1; grid-row: 1; }
.masthead__actions { grid-column: 2; grid-row: 1; justify-self: end; }
.masthead__notice { grid-column: 1 / -1; grid-row: 2; }

.masthead__notice {
  padding-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--char);
  border-left: var(--bw) solid var(--ice);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ice);
  background: var(--space);
  border: 2px solid var(--space);
  box-shadow: 4px 4px 0 var(--orange);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.2; }

.brand__name {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--space);
}

.brand__line {
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--deepice);
}

.masthead__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--space);
  background: var(--ice);
  border: 2px solid var(--space);
  box-shadow: 3px 3px 0 var(--space);
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--space);
  transition: transform 0.2s ease, top 0.2s ease, bottom 0.2s ease;
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  bottom: 5px;
  transform: rotate(-45deg);
}

/* ---------- frame navigation ---------- */
.frame-nav {
  display: none;
  background: var(--snow);
  border-top: 2px solid var(--space);
}

.frame-nav[data-open] {
  display: block;
  animation: frameOpen 0.24s ease-out both;
}

@keyframes frameOpen {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.frame-nav__list { display: flex; flex-direction: column; }

.frame-nav__item { border-top: 1px solid var(--silver); }
.frame-nav__item:first-child { border-top: 0; }

.frame-nav__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.8rem clamp(0.75rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--space);
  text-decoration: none;
  border-bottom: var(--bw) solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.frame-nav__link:hover { background: var(--ice); }

.frame-nav__link[aria-current="page"] {
  background: var(--space);
  color: var(--snow);
  border-bottom-color: var(--orange);
}

.frame-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.frame-nav__link[aria-current="page"] .frame-nav__idx { color: var(--aurora); }

.frame-nav__label { display: inline-block; }

.scroll-meter {
  height: 3px;
  background: var(--silver);
  overflow: hidden;
}

.scroll-meter__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--aurora));
  transition: width 0.12s linear;
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .masthead {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  .masthead > .brand { grid-column: 1; grid-row: 1; }
  .masthead__notice { grid-column: 2; grid-row: 1; }
  .masthead__actions { grid-column: 3; grid-row: 1; }

  .frame-nav {
    display: block;
    border-top: 2px solid var(--space);
  }

  .frame-nav__list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .frame-nav__item {
    flex: 1 1 auto;
    border-top: 0;
    border-left: 1px solid var(--silver);
  }

  .frame-nav__item:first-child { border-left: 0; }

  .frame-nav__link {
    justify-content: flex-start;
    padding-inline: clamp(0.9rem, 2vw, 1.6rem);
  }
}

/* ---------- footer frame ---------- */
.site-foot {
  margin-top: clamp(3rem, 6vw, 6rem);
  color: var(--snow);
  background: var(--space);
  border-top: 6px solid var(--orange);
}

.foot-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 1.5rem;
  padding: 0.55rem clamp(1rem, 3vw, 2.25rem);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ice);
  background: var(--deepice);
  border-bottom: 1px solid rgba(143, 216, 255, 0.28);
}

.foot-strip__sync { color: var(--aurora); }

.foot-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem 2.5rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(2rem, 4vw, 3.25rem) clamp(1rem, 3vw, 2.25rem);
}

.foot-brand__name {
  display: inline-block;
  padding-bottom: 0.25rem;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--snow);
  border-bottom: var(--bw) solid var(--orange);
}

.foot-brand__desc {
  max-width: 42ch;
  margin-top: 0.9rem;
  font-size: 0.9375rem;
  color: var(--silver);
}

.site-foot .btn { box-shadow: 4px 4px 0 var(--ice); }
.site-foot .btn:active { box-shadow: 0 0 0 var(--ice); }

.foot-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 1rem;
}

.foot-col__title {
  display: inline-block;
  padding-bottom: 0.2rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--snow);
  text-decoration: none;
  border-bottom: 2px solid var(--ice);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.foot-col__title:hover {
  color: var(--ice);
  border-bottom-color: var(--orange);
}

.foot-col__list {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.75rem;
}

.foot-col__item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.foot-contact {
  grid-column: 1 / -1;
  display: grid;
  gap: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(199, 215, 229, 0.25);
}

.foot-contact__title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--aurora);
}

.foot-contact__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
}

.foot-contact__item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.9375rem;
  color: var(--snow);
  word-break: break-word;
}

.mono-label {
  flex: 0 0 auto;
  padding: 0.1rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--ice);
  border: 1px solid rgba(143, 216, 255, 0.45);
}

.foot-note {
  max-width: 70ch;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--silver);
}

.foot-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 1rem clamp(1rem, 3vw, 2.25rem) 2rem;
  border-top: 1px solid rgba(199, 215, 229, 0.2);
}

.foot-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.foot-legal__links a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.foot-legal__links a:hover {
  color: var(--snow);
  border-bottom-color: var(--orange);
}

.foot-legal__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

@media (min-width: 640px) {
  .foot-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 820px) {
  .foot-inner { grid-template-columns: minmax(240px, 1fr) minmax(0, 2.2fr); }
}

@media (min-width: 1080px) {
  .foot-nav { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--deepice);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--orange);
}

.breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid var(--silver);
}

.breadcrumb a:hover { border-bottom-color: var(--orange); }

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

/* ---------- paper reading zone ---------- */
.prose {
  padding: clamp(1.25rem, 3vw, 2.5rem);
  color: var(--char);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    0deg,
    rgba(43, 52, 64, 0.035) 0,
    rgba(43, 52, 64, 0.035) 1px,
    transparent 1px,
    transparent 4px
  );
  border: var(--bw) solid var(--space);
  box-shadow: var(--shadow-soft);
}

.prose h2, .prose h3 { margin-top: 1.6em; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }
.prose p + p { margin-top: 1em; }
.prose a { color: var(--deepice); text-decoration: underline; text-decoration-color: var(--orange); }

.prose ul { margin-top: 1em; display: grid; gap: 0.4rem; }
.prose ul li { padding-left: 1.4rem; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 14px;
  height: 2px;
  background: var(--orange);
}

/* ---------- status panels ---------- */
.panel {
  padding: clamp(1rem, 2.5vw, 1.75rem);
  background: var(--snow);
  border: var(--bw) solid var(--space);
  box-shadow: var(--shadow-hard);
}

.panel--ice { background: var(--ice); }
.panel--paper { background: var(--paper); }

.panel--deep {
  color: var(--snow);
  background: var(--space);
  box-shadow: 6px 6px 0 var(--aurora);
}

.panel--deep h2, .panel--deep h3, .panel--deep h4 { color: var(--snow); }

/* ---------- responsive media frames ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--deepice);
  border: var(--bw) solid var(--space);
  box-shadow: var(--shadow-soft);
}

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

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

.media-frame--placeholder {
  background-color: var(--deepice);
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(143, 216, 255, 0.22) 0,
    rgba(143, 216, 255, 0.22) 2px,
    transparent 2px,
    transparent 12px
  );
}

.media-frame__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 216, 255, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 216, 255, 0.25) 1px, transparent 1px);
  background-size: 32px 32px;
  mix-blend-mode: screen;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--snow);
  background: linear-gradient(180deg, rgba(10, 27, 46, 0), rgba(10, 27, 46, 0.88));
}

/* ---------- filter tools ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--ice-soft);
  border: 2px dashed var(--deepice);
}

.chip {
  padding: 0.45rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--space);
  background: var(--snow);
  border: 2px solid var(--space);
  cursor: pointer;
  transition: background-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.chip:hover {
  background: var(--ice);
  transform: translateY(-1px);
}

.chip[aria-pressed="true"] {
  background: var(--aurora);
  box-shadow: 3px 3px 0 var(--space);
}

.filter-status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--deepice);
}

.filter-item[hidden] { display: none !important; }

.filter-empty {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--deepice);
  background: var(--snow);
  border: 2px dashed var(--silver);
}

/* ---------- reveal ---------- */
.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.32s ease, transform 0.32s ease;
}

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

/* ---------- reduced motion ---------- */
@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;
  }

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

  .scroll-meter__fill { transition: none; }
}