/* ============================================================
   优发国际址站 · 共享外壳样式  /assets/site.css
   坐标档案 / 航海刻度 视觉系统
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

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

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

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

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

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

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

/* ---------- 2. Tokens ---------- */
:root {
  --c-ink:        #0B2545;
  --c-ink-2:      #123B5D;
  --c-ink-deep:   #071A31;
  --c-mist:       #E8EEF4;
  --c-paper:      #F7F3EA;
  --c-coral:      #FF6B4A;
  --c-coral-deep: #C7472B;
  --c-gold:       #E6B566;
  --c-gold-ink:   #8E6B25;
  --c-jade:       #2FBF9F;
  --c-jade-ink:   #14806C;
  --c-line:       #1E2A36;
  --c-haze:       #8FA3B5;

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

  --fs-xs: 0.72rem;
  --fs-sm: 0.85rem;
  --fs-base: clamp(1rem, 0.96rem + 0.18vw, 1.0625rem);
  --fs-md: clamp(1.05rem, 1rem + 0.35vw, 1.2rem);
  --fs-lg: clamp(1.35rem, 1.15rem + 1vw, 1.85rem);
  --fs-xl: clamp(1.9rem, 1.4rem + 2.4vw, 3rem);
  --fs-display: clamp(2.4rem, 1.55rem + 4.2vw, 4.4rem);

  --shell: 1320px;
  --gutter: clamp(18px, 4vw, 56px);
  --grid-line: rgba(11, 37, 69, 0.055);
  --hair: rgba(30, 42, 54, 0.16);
  --hair-gold: rgba(230, 181, 102, 0.32);
  --shadow-paper: 8px 8px 0 -1px var(--c-mist),
                  8px 8px 0 0 rgba(30, 42, 54, 0.1);
}

/* ---------- 3. Base / 中文排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--c-line);
  background-color: var(--c-paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-ink);
  text-wrap: balance;
}

h1 { font-size: var(--fs-display); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); letter-spacing: -0.005em; }

p { text-wrap: pretty; }

strong, b { font-weight: 700; color: var(--c-ink); }

::selection { background: var(--c-coral); color: #2A0E07; }

:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 2px;
  border-radius: 1px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 220;
  padding: 11px 20px;
  background: var(--c-coral);
  color: #2A0E07;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-220%);
  transition: transform 0.22s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 4. Utilities ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 96px); }

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-haze);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  color: var(--c-coral-deep);
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  flex: 0 0 auto;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 820px) {
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.4;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.22s ease, color 0.22s ease,
              border-color 0.22s ease, transform 0.22s ease;
}
.btn::after {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: width 0.22s ease;
}
.btn:hover::after { width: 24px; }

.btn--coral {
  background: var(--c-coral);
  color: #2A0E07;
}
.btn--coral:hover,
.btn--coral:focus-visible {
  background: var(--c-coral-deep);
  color: var(--c-paper);
}

.btn--ghost {
  border-color: var(--hair-gold);
  color: var(--c-gold);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--c-gold);
  background: rgba(230, 181, 102, 0.12);
  color: var(--c-paper);
}

/* ---------- 6. Breadcrumb ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--c-haze);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li::after {
  content: "/";
  color: rgba(143, 163, 181, 0.7);
}
.breadcrumb li:last-child::after { content: none; }
.breadcrumb a { color: var(--c-ink-2); }
.breadcrumb a:hover { color: var(--c-coral-deep); }
.breadcrumb [aria-current="page"] { color: var(--c-coral-deep); }

/* ---------- 7. Paper / Tag / Dot / Rule ---------- */
.paper {
  background: var(--c-paper);
  border: 1px solid var(--hair);
  padding: clamp(18px, 2.4vw, 32px);
}

.paper-stack { box-shadow: var(--shadow-paper); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  line-height: 1.6;
  border: 1px solid currentColor;
  color: var(--c-ink-2);
  white-space: nowrap;
}
.tag--coral { color: var(--c-coral-deep); }
.tag--gold  { color: var(--c-gold-ink); }
.tag--jade  { color: var(--c-jade-ink); }

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-jade);
  box-shadow: 0 0 0 3px rgba(47, 191, 159, 0.18);
  flex: 0 0 auto;
}

.scale-rule {
  height: 12px;
  border-top: 1px solid var(--hair);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(30, 42, 54, 0.34) 0 1px,
    transparent 1px 14px
  );
  background-repeat: repeat-x;
}

/* ---------- 8. Media frame (页面阶段放图) ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(120% 100% at 15% 0%, rgba(47, 191, 159, 0.18), transparent 60%),
    linear-gradient(150deg, var(--c-ink-2), var(--c-ink));
  border: 1px solid var(--hair-gold);
}
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--wide   { aspect-ratio: 21 / 9; }
.media-frame--tall   { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--c-haze);
}

/* ---------- 9. Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease,
              transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal.is-shown {
  opacity: 1;
  transform: none;
}

/* ============================================================
   10. HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--c-ink);
  color: var(--c-paper);
  border-bottom: 1px solid var(--hair-gold);
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
}
.site-header[data-condensed] {
  background: var(--c-ink-deep);
  box-shadow: 0 20px 34px -30px rgba(2, 9, 18, 0.95);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: 78px;
  transition: min-height 0.28s ease;
}
.site-header[data-condensed] .header-inner { min-height: 54px; }

/* --- brand --- */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--c-gold);
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.brand-mark::before {
  content: "";
  width: 12px;
  height: 12px;
  border: 1px solid var(--c-coral);
  border-radius: 50%;
}
.brand-mark::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--c-jade);
  border-bottom: 2px solid var(--c-jade);
}
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark { transform: rotate(45deg); }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}
.brand-name {
  font-size: 1.16rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #fff;
  white-space: nowrap;
}
.brand-sub {
  overflow: hidden;
  max-height: 1.4em;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--c-haze);
  white-space: nowrap;
  transition: max-height 0.28s ease, opacity 0.24s ease;
}
.site-header[data-condensed] .brand-sub {
  max-height: 0;
  opacity: 0;
}

/* --- meta chips --- */
.header-meta {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  transition: opacity 0.24s ease;
}
.meta-chip {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  line-height: 1.75;
  color: var(--c-gold);
  border: 1px solid var(--hair-gold);
  white-space: nowrap;
}
.meta-chip--ver {
  background: rgba(230, 181, 102, 0.14);
  color: #F3D6A2;
}
.meta-chip--date { color: var(--c-jade); border-color: rgba(47, 191, 159, 0.4); }

.site-header[data-condensed] .header-meta {
  opacity: 0;
  pointer-events: none;
}

/* --- nav --- */
.site-nav {
  margin-left: auto;
  min-width: 0;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-link {
  position: relative;
  display: block;
  padding: 26px 13px;
  font-size: 0.94rem;
  letter-spacing: 0.02em;
  color: #C7D6E3;
  transition: color 0.2s ease, padding 0.28s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  bottom: 13px;
  width: 16px;
  height: 2px;
  background: var(--c-coral);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.nav-link:hover,
.nav-link:focus-visible { color: #fff; }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: #fff;
  font-weight: 700;
}
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-coral);
}

.site-header[data-condensed] .nav-link { padding-block: 14px; }

/* --- toggle --- */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--hair-gold);
  color: var(--c-paper);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--c-gold); }
.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 18px;
}
.nav-toggle-bars span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--c-coral);
  transition: transform 0.26s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(3.25px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) {
  transform: translateY(-3.25px) rotate(-45deg);
}
.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  color: var(--c-gold);
}

/* --- scroll scale --- */
.header-scale {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  overflow: hidden;
  background-color: rgba(4, 14, 26, 0.55);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(230, 181, 102, 0.4) 0 1px,
    transparent 1px 14px
  );
}
.header-scale-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-coral), var(--c-gold));
  transition: transform 0.14s linear;
}

/* --- mobile header --- */
@media (max-width: 940px) {
  .site-header { position: sticky; }
  .header-meta { display: none; }
  .nav-toggle { display: inline-flex; }
  .brand-sub { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--c-ink-2);
    border-top: 1px solid var(--hair-gold);
    border-bottom: 1px solid var(--hair-gold);
    box-shadow: 0 26px 44px -26px rgba(3, 12, 24, 0.95);
    transition: max-height 0.34s ease, visibility 0.34s linear;
  }
  .site-nav[data-open] {
    max-height: 76vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-width: var(--shell);
    margin-inline: auto;
    padding: 6px var(--gutter) 18px;
  }
  .nav-item { border-bottom: 1px solid rgba(230, 181, 102, 0.16); }
  .nav-item:last-child { border-bottom: 0; }
  .nav-link {
    padding: 15px 2px;
    font-size: 1rem;
  }
  .nav-link::after {
    left: 2px;
    bottom: 9px;
    width: 22px;
  }
  .site-header[data-condensed] .nav-link { padding-block: 15px; }
}

@media (max-width: 420px) {
  .brand-name { font-size: 1.02rem; }
  .nav-toggle { padding: 8px 11px; }
  .nav-toggle-label { display: none; }
}

/* ============================================================
   11. FOOTER
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  color: #C4D4E1;
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(47, 191, 159, 0.16), transparent 58%),
    radial-gradient(90% 80% at 92% 12%, rgba(255, 107, 74, 0.12), transparent 56%),
    linear-gradient(180deg, var(--c-ink) 0%, var(--c-ink-deep) 100%);
}

.footer-scale {
  height: 10px;
  border-bottom: 1px solid rgba(230, 181, 102, 0.2);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(230, 181, 102, 0.55) 0 1px,
    transparent 1px 16px
  );
  opacity: 0.7;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr) minmax(0, 0.8fr) minmax(0, 1.1fr);
  gap: clamp(24px, 3.4vw, 54px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(38px, 6vw, 72px) var(--gutter) clamp(26px, 4vw, 46px);
}

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

.footer-brandline {
  font-size: clamp(1.15rem, 1rem + 1.1vw, 1.55rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--c-paper);
}
.footer-summary {
  margin-top: 14px;
  max-width: 36ch;
  font-size: 0.92rem;
  line-height: 1.85;
  color: #9DB2C5;
}
.footer-lead .btn { margin-top: 22px; }

.footer-coord {
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: rgba(143, 163, 181, 0.75);
}

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

.footer-col-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(230, 181, 102, 0.22);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  color: var(--c-gold);
}

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

.footer-link {
  position: relative;
  display: inline-block;
  padding-block: 5px;
  font-size: 0.92rem;
  color: #C4D4E1;
  transition: color 0.2s ease;
}
.footer-link::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--c-coral);
  opacity: 0;
  transform: translateX(-5px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}
.footer-link:hover,
.footer-link:focus-visible { color: #fff; }
.footer-link:hover::before,
.footer-link:focus-visible::before {
  opacity: 1;
  transform: none;
}

.footer-list--contact { gap: 0; }

.contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  padding-block: 8px;
  border-bottom: 1px dashed rgba(143, 163, 181, 0.26);
}
.contact-key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--c-jade);
}
.contact-val {
  flex: 1 1 10ch;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-paper);
  overflow-wrap: anywhere;
}

.copy-btn {
  margin-left: auto;
  padding: 2px 9px;
  border: 1px solid var(--hair-gold);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--c-gold);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.copy-btn:hover,
.copy-btn:focus-visible {
  background: rgba(230, 181, 102, 0.16);
  color: var(--c-paper);
}
.copy-btn[data-copied] {
  border-color: var(--c-jade);
  color: var(--c-jade);
  background: rgba(47, 191, 159, 0.12);
}

.contact-note {
  margin-top: 12px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: #8CA0B3;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 30px;
  border-top: 1px solid rgba(143, 163, 181, 0.2);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--c-haze);
}
.footer-copy { color: #A8BCCD; }
.footer-icp { color: rgba(143, 163, 181, 0.85); }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-left: auto;
}
.footer-legal .footer-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding-block: 0;
}

@media (max-width: 1080px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-lead,
  .footer-col--contact { grid-column: 1 / -1; }
  .footer-summary { max-width: 52ch; }
}

@media (max-width: 600px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-legal { margin-left: 0; }
  .footer-base { gap: 8px 16px; }
  .copy-btn { margin-left: 0; }
}

/* ============================================================
   12. 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;
  }

  .reveal { opacity: 1; transform: none; }

  .brand:hover .brand-mark,
  .brand:focus-visible .brand-mark { transform: none; }
}