/* ==========================================================
   易倍看台 · 共享样式 /assets/site.css
   看台深墨绿基底 + 荧光青/信号橙强调 + 印刷叠层与坐标索引
   ========================================================== */

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

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

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote, ul, ol, 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;
  cursor: pointer;
}

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

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

/* ---------- 2. tokens ---------- */
:root {
  --ink: #071C16;
  --ink-deep: #0E1512;
  --card: #15362D;
  --cyan: #35F2C2;
  --cyan-soft: #B8FFE8;
  --orange: #FF6A2B;
  --orange-soft: #FFD2BE;
  --paper: #F7F2E8;
  --mist: #94A69E;
  --line: #2C4A40;

  --font-display: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 1320px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 18px;
  --pill: 999px;
  --ease: cubic-bezier(.22, .8, .28, 1);
}

/* ---------- 3. base ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(110% 70% at 88% -8%, rgba(53, 242, 194, .10), transparent 62%),
    radial-gradient(90% 60% at -6% 4%, rgba(255, 106, 43, .07), transparent 58%),
    var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(16px, 1vw, 17.5px);
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--cyan); color: #03231b; }

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

#main-content { display: block; scroll-margin-top: 104px; }

/* ---------- 4. utilities ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 840px; }

.section { padding-block: clamp(40px, 6vw, 88px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px 28px;
  margin-bottom: clamp(20px, 3vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--orange);
}

.display-1,
.display-2,
.display-3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.012em;
  line-height: 1.06;
}

.display-1 { font-size: clamp(38px, 7vw, 86px); }
.display-2 { font-size: clamp(28px, 4.4vw, 54px); }
.display-3 { font-size: clamp(21px, 2.6vw, 32px); line-height: 1.24; }

.lede {
  max-width: 46ch;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.85;
  color: rgba(247, 242, 232, .78);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--mist);
}

.chip--cyan { background: var(--cyan-soft); color: #06302a; border-color: transparent; }
.chip--orange { background: var(--orange-soft); color: #4a1e0c; border-color: transparent; }
.chip--outline { background: transparent; color: var(--cyan); border-color: rgba(53, 242, 194, .45); }

.panel {
  padding: clamp(18px, 2.4vw, 32px);
  background: rgba(21, 54, 45, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.panel--paper {
  background: var(--paper);
  color: #0b1f19;
  border-color: #d8d1c2;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--sidebar { grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); align-items: start; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.breadcrumb a { color: var(--mist); transition: color .2s; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

.breadcrumb-sep { color: var(--line); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  transition: transform .22s var(--ease), background .22s, color .22s, border-color .22s;
}

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

.btn-signal {
  background: var(--orange);
  color: #1a0a03;
  box-shadow: 0 10px 26px -14px rgba(255, 106, 43, .95);
}

.btn-signal:hover { background: #ff8347; }

.btn-cyan { background: var(--cyan); color: #03231b; }
.btn-cyan:hover { background: var(--cyan-soft); }

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

.btn-ghost:hover { color: var(--cyan); border-color: rgba(53, 242, 194, .55); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cyan);
}

.link-arrow::after { content: "→"; transition: transform .2s var(--ease); }
.link-arrow:hover::after { transform: translateX(4px); }

.scorebar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--card);
  border-left: 3px solid var(--cyan);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  transform: skewX(-6deg);
}

.scorebar > * { transform: skewX(6deg); }

/* 可复用图片容器：页面阶段直接放入 <img> */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(90deg, rgba(53, 242, 194, .07) 0 1px, transparent 1px 56px),
    var(--card);
  isolation: isolate;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 28, 22, 0) 42%, rgba(7, 28, 22, .62) 100%);
  pointer-events: none;
}

.media--21x9 { aspect-ratio: 21 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }

.media-label {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 4px 11px;
  border: 1px solid rgba(53, 242, 194, .5);
  border-radius: var(--pill);
  background: rgba(7, 28, 22, .8);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
}

/* 滚动显现 */
[data-reveal] {
  transition: opacity .65s var(--ease), transform .65s var(--ease);
  transition-delay: calc(var(--reveal-i, 0) * 70ms);
}

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
}

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

/* ---------- 5. header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: clamp(10px, 1.4vw, 18px) var(--gutter);
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(7, 28, 22, .96) 0%, rgba(7, 28, 22, .74) 58%, rgba(7, 28, 22, 0) 100%);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 70;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--orange) 100%);
  pointer-events: none;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 12px 20px;
  border-radius: var(--pill);
  background: var(--cyan);
  color: #03231b;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  transform: translateY(-180%);
  transition: transform .25s var(--ease);
}

.skip-link:focus-visible { transform: none; }

.header-shell {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: var(--shell);
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px 8px 8px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(21, 54, 45, .84);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: border-color .25s, background .25s;
}

.brand:hover { border-color: rgba(53, 242, 194, .55); }

.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--cyan) 0%, #1ec9a2 62%, #0b3a2e 100%);
  color: #03231b;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .08em;
}

.brand-tagline {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
}

.nav-island {
  display: flex;
  align-items: center;
  margin-left: auto;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(21, 54, 45, .84);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--pill);
  font-size: 14px;
  letter-spacing: .05em;
  white-space: nowrap;
  color: rgba(247, 242, 232, .76);
  transition: color .2s, background .2s;
}

.nav-link:hover {
  color: var(--cyan);
  background: rgba(53, 242, 194, .10);
}

.nav-link[aria-current="page"] {
  background: var(--cyan);
  color: #03231b;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-cta {
  padding: 10px 18px;
  font-size: 13px;
  letter-spacing: .05em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 11px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(21, 54, 45, .88);
  color: var(--paper);
}

.nav-toggle-label {
  font-size: 12.5px;
  letter-spacing: .14em;
}

.nav-toggle-bar {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: background .2s;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform .25s var(--ease), top .25s var(--ease);
}

.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }

.site-header[data-state="condensed"] .brand,
.site-header[data-state="condensed"] .nav-island {
  background: rgba(14, 21, 18, .95);
}

.site-header[data-state="condensed"] .brand { padding-block: 5px; }
.site-header[data-state="condensed"] .nav-link { padding-block: 6px; }

/* ---------- 6. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 10vw, 130px);
  border-top: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(53, 242, 194, .055) 0 1px, transparent 1px 76px),
    var(--ink-deep);
  color: var(--paper);
  overflow: hidden;
}

.footer-inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gutter) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1.05fr) minmax(0, .8fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(30px, 5vw, 56px);
}

.footer-col { min-width: 0; }

.footer-brand-line {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.1vw, 25px);
  font-weight: 800;
  line-height: 1.36;
  letter-spacing: .02em;
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 6px 14px;
  border-radius: var(--pill);
  background: var(--cyan-soft);
  color: #06302a;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
}

.footer-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #0a8f74;
}

.footer-note {
  max-width: 36ch;
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--mist);
}

.footer-heading {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 0;
  font-size: 15px;
  color: rgba(247, 242, 232, .82);
  transition: color .2s, transform .2s var(--ease);
}

.footer-nav-link::before {
  content: "—";
  font-family: var(--font-mono);
  color: var(--line);
  transition: color .2s;
}

.footer-nav-link:hover { color: var(--cyan); transform: translateX(3px); }
.footer-nav-link:hover::before { color: var(--cyan); }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-label {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.contact-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.copy-btn {
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
  transition: color .2s, background .2s, border-color .2s;
}

.copy-btn:hover {
  color: #03231b;
  background: var(--cyan);
  border-color: var(--cyan);
}

.copy-btn[data-copied] {
  color: #03231b;
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

.copy-status {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 26px;
  padding: 20px 0 26px;
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.footer-meta,
.footer-copy {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
}

.footer-wordmark {
  margin: 0 var(--gutter) -.14em;
  font-family: var(--font-display);
  font-size: clamp(64px, 17vw, 220px);
  font-weight: 800;
  line-height: .8;
  letter-spacing: -.02em;
  text-align: right;
  color: rgba(53, 242, 194, .09);
  -webkit-text-stroke: 1px rgba(53, 242, 194, .22);
  pointer-events: none;
  user-select: none;
}

/* ---------- 7. responsive ---------- */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .brand-tagline { display: none; }

  .header-actions { margin-left: auto; }

  .nav-island {
    position: absolute;
    top: calc(100% - 2px);
    left: var(--gutter);
    right: var(--gutter);
    z-index: 65;
    display: block;
    margin-left: 0;
    padding: 10px;
    border-radius: 24px;
    background: rgba(14, 21, 18, .98);
    box-shadow: 0 28px 64px -24px rgba(0, 0, 0, .9);
    max-height: calc(100vh - 130px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s;
  }

  .nav-island[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    padding: 13px 16px;
    border-radius: 14px;
    font-size: 15px;
  }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--sidebar { grid-template-columns: 1fr; }

  .section-head { align-items: flex-start; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 520px) {
  .header-cta { display: none; }
  .brand { padding-right: 12px; }
  .brand-name { font-size: 16px; }
  .section { padding-block: 36px; }
}

/* ---------- 8. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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

  .btn:hover,
  .footer-nav-link:hover { transform: none; }
}