/* 黔前智算 OPC科创中心 — editorial redesign
   Direction: Guizhou mist green × limestone × copper
   Light-first, optional dark */

@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700&family=Noto+Serif+SC:wght@500;700&display=swap");

:root,
[data-theme="light"] {
  --ink: #1a2a24;
  --ink-soft: #4a5c54;
  --paper: #f3f6f2;
  --paper-2: #e7eee9;
  --panel: #ffffff;
  --line: rgba(26, 42, 36, 0.12);
  --brand: #2f5d4c;
  --brand-deep: #1e4035;
  --copper: #c47a3a;
  --mist: #9eb8ac;
  --muted: var(--ink-soft);
  --header: rgba(243, 246, 242, 0.88);
  --hero-veil: linear-gradient(105deg, rgba(243, 246, 242, 0.92) 0%, rgba(243, 246, 242, 0.55) 48%, rgba(243, 246, 242, 0.18) 100%);
  --page-wash:
    radial-gradient(900px 480px at 85% 0%, rgba(158, 184, 172, 0.35), transparent 60%),
    linear-gradient(180deg, #eef3ef 0%, var(--paper) 28%, #e6ede8 100%);
  --shadow-soft: 0 1px 0 rgba(26, 42, 36, 0.04);
  --radius: 6px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Manrope", "PingFang SC", "Noto Sans SC", sans-serif;
  --max: 1120px;
  color-scheme: light;
}

[data-theme="dark"] {
  --ink: #e8efea;
  --ink-soft: #a7b8b0;
  --paper: #121a17;
  --paper-2: #1a2621;
  --panel: #18241f;
  --line: rgba(232, 239, 234, 0.12);
  --brand: #7eb39a;
  --brand-deep: #b7d4c6;
  --copper: #d4a06a;
  --mist: #3d554b;
  --muted: var(--ink-soft);
  --header: rgba(18, 26, 23, 0.9);
  --hero-veil: linear-gradient(105deg, rgba(18, 26, 23, 0.92) 0%, rgba(18, 26, 23, 0.62) 50%, rgba(18, 26, 23, 0.28) 100%);
  --page-wash:
    radial-gradient(900px 480px at 80% -10%, rgba(62, 96, 82, 0.35), transparent 55%),
    linear-gradient(180deg, #0e1512 0%, var(--paper) 40%, #101814 100%);
  --shadow-soft: none;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e8efea;
    --ink-soft: #a7b8b0;
    --paper: #121a17;
    --paper-2: #1a2621;
    --panel: #18241f;
    --line: rgba(232, 239, 234, 0.12);
    --brand: #7eb39a;
    --brand-deep: #b7d4c6;
    --copper: #d4a06a;
    --mist: #3d554b;
    --header: rgba(18, 26, 23, 0.9);
    --hero-veil: linear-gradient(105deg, rgba(18, 26, 23, 0.92) 0%, rgba(18, 26, 23, 0.62) 50%, rgba(18, 26, 23, 0.28) 100%);
    --page-wash:
      radial-gradient(900px 480px at 80% -10%, rgba(62, 96, 82, 0.35), transparent 55%),
      linear-gradient(180deg, #0e1512 0%, var(--paper) 40%, #101814 100%);
    color-scheme: dark;
  }
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--page-wash);
  background-color: var(--paper);
  min-height: 100vh;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--header);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 4rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.25;
  flex-shrink: 1;
  min-width: 0;
}
.brand span { color: var(--brand); white-space: nowrap; }

.nav-links {
  display: flex;
  gap: 1.1rem;
  margin-left: auto;
  margin-right: 0.5rem;
  min-width: 0;
}
.nav-links a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  position: relative;
  padding: 0.25rem 0;
}
.nav-links a:hover,
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -0.35rem;
  height: 2px;
  background: var(--copper);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.5rem;
  padding: 0.55rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn-primary {
  background: var(--brand-deep);
  color: #f5faf7;
}
.btn-primary:hover { transform: translateY(-1px); background: var(--brand); }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand-deep); }

.theme-toggle {
  min-width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--brand); }

.menu-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
}
.menu-toggle span {
  width: 16px;
  height: 1.5px;
  background: var(--ink);
  transition: 0.2s ease;
}
.menu-toggle.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-panel {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--panel);
  padding: 0.75rem 1rem 1.25rem;
}
.mobile-panel[hidden] { display: none !important; }
.mobile-links { display: grid; }
.mobile-links a {
  padding: 0.85rem 0.4rem;
  border-bottom: 1px solid var(--line);
  font-weight: 500;
}
.mobile-links a:last-child { border-bottom: 0; }
.mobile-cta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 1rem;
}
.mobile-cta .btn { width: 100%; }
body.nav-open { overflow: hidden; }

/* —— Hero (full-bleed, brand first) —— */
.hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: flex;
  align-items: flex-end;
  padding: 0 0 4.5rem;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: url("/images/hero-bg.svg") center/cover no-repeat;
  animation: heroDrift 18s ease-in-out infinite alternate;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--hero-veil);
}
.hero .container { width: min(100% - 2rem, var(--max)); }
.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 7vw, 4.4rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.02em;
  margin: 0 0 0.85rem;
  animation: riseIn 0.9s ease both;
}
.hero-brand span {
  display: inline-block;
  color: var(--brand-deep);
}
.hero-slogan {
  margin: 0 0 0.85rem;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  color: var(--copper);
  letter-spacing: 0.12em;
  animation: riseIn 0.9s ease 0.08s both;
}
.hero-desc {
  max-width: 34rem;
  margin: 0 0 1.6rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
  animation: riseIn 0.9s ease 0.16s both;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  animation: riseIn 0.9s ease 0.24s both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
@keyframes heroDrift {
  from { transform: scale(1.02) translate3d(0, 0, 0); }
  to { transform: scale(1.06) translate3d(-1.2%, 0.8%, 0); }
}

/* —— Sections —— */
.section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--line);
}
.section-kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  color: var(--copper);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.55rem;
  letter-spacing: 0.02em;
}
.section-lead {
  margin: 0 0 2rem;
  max-width: 36rem;
  color: var(--ink-soft);
}

/* Focus strip / banner */
.focus-rail {
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.focus-item {
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--line);
  transition: background 0.2s ease;
}
.focus-item:last-child { border-bottom: 0; }
.focus-item:hover { background: var(--paper-2); }
.focus-item .idx {
  font-family: var(--font-display);
  color: var(--mist);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}
.focus-item h3 {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
  font-weight: 650;
}
.focus-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.focus-item .go {
  color: var(--brand);
  font-weight: 600;
  font-size: 0.86rem;
  white-space: nowrap;
}

/* Product rows — not cards */
.product-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.product-row {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: padding-left 0.25s ease;
}
.product-row:hover { padding-left: 0.4rem; }
.product-row .num {
  font-family: var(--font-display);
  color: var(--copper);
  font-size: 1.1rem;
  padding-top: 0.15rem;
}
.product-row h3 {
  margin: 0 0 0.3rem;
  font-size: 1.15rem;
  font-family: var(--font-display);
}
.product-row p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 40rem;
}

/* Support band */
.support-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.support-cell {
  padding: 1.5rem 1.2rem;
  border-right: 1px solid var(--line);
}
.support-cell:last-child { border-right: 0; }
.support-cell h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}
.support-cell p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* Loop steps */
.loop-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  position: relative;
}
.loop-step {
  padding: 0;
  background: transparent;
  border: 0;
}
.loop-step strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}
.loop-step span {
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.loop-step .step-i {
  display: block;
  color: var(--copper);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  margin-bottom: 0.55rem;
  font-weight: 700;
}

/* Milestones */
.mile-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  padding-top: 0.5rem;
}
.mile {
  border-top: 2px solid var(--brand);
  padding-top: 1rem;
}
.mile .num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--brand-deep);
  margin-bottom: 0.45rem;
}
.mile .label {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* Featured */
.feature-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.2rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}
.feature-tabs .tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0.7rem 0;
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 600;
}
.feature-tabs .tab.active {
  color: var(--ink);
  border-bottom-color: var(--copper);
}
.feature-list { display: grid; gap: 0; }
.feature-item {
  display: grid;
  gap: 0.25rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.feature-item h3 {
  margin: 0;
  font-size: 1.08rem;
  font-family: var(--font-display);
}
.feature-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* Quick links */
.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}
.quick-links a {
  font-weight: 600;
  color: var(--brand-deep);
  border-bottom: 1px solid color-mix(in srgb, var(--brand) 40%, transparent);
  padding-bottom: 0.15rem;
}
.quick-links a:hover { color: var(--copper); border-bottom-color: var(--copper); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 3rem 0 3.5rem;
  color: var(--ink-soft);
  background: var(--paper-2);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 2rem;
}
.footer-title {
  color: var(--ink);
  font-family: var(--font-display);
}
.qr-box {
  margin-top: 0.7rem;
  width: 7.5rem;
  height: 7.5rem;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  background: var(--panel);
}

/* Inner page intro */
.page-intro {
  padding: 3.5rem 0 1rem;
}
.page-intro .section-kicker { margin-bottom: 0.6rem; }
.page-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.5vw, 2.6rem);
  margin: 0 0 0.65rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
}
.page-intro .section-lead { margin-bottom: 0; }
.prose-block {
  padding: 2rem 0 0;
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
.prose-block h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0 0 0.85rem;
}
.prose-block + .prose-block { margin-top: 2.5rem; }
.invest-list,
.ask-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.invest-row,
.ask-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.invest-row .pct,
.ask-row .tag {
  font-family: var(--font-display);
  color: var(--copper);
  font-size: 1.05rem;
}
.invest-row h3,
.ask-row h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}
.invest-row p,
.ask-row p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* Forms / inner pages reuse */
.form-card {
  max-width: 32rem;
  margin: 1.5rem auto;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.form-card label {
  display: block;
  margin: 0.85rem 0 0.35rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}
.form-card input,
.form-card select,
.form-card textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 0.7rem 0.8rem;
}
.form-card .row { display: flex; gap: 0.5rem; align-items: center; }
.form-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.msg { margin-top: 0.8rem; color: var(--brand); min-height: 1.2em; }
.msg.err { color: #b33b3b; }

/* Legacy class bridges used by other pages */
.cards { display: grid; gap: 0; }
.card {
  display: block;
  width: 100%;
  text-align: left;
  padding: 1.25rem 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  color: inherit;
}
.card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
}
.card p { margin: 0; color: var(--ink-soft); }
.stage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.stage-card {
  padding: 0;
  border: 0;
  background: transparent;
}
.stage-card strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 0.35rem;
}
.stage-card span { color: var(--ink-soft); font-size: 0.92rem; }
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.stat {
  border-top: 2px solid var(--brand);
  padding-top: 1rem;
  background: transparent;
}
.stat .num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--brand-deep);
  line-height: 1;
}
.stat .label { color: var(--ink-soft); margin-top: 0.4rem; }
.tabs { display: flex; gap: 1rem; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin-bottom: 1rem; }
.tab {
  border: 0;
  background: none;
  padding: 0.7rem 0;
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 600;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab.active { color: var(--ink); border-bottom-color: var(--copper); }
.quick {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}
.quick a {
  font-weight: 600;
  color: var(--brand-deep);
  border-bottom: 1px solid color-mix(in srgb, var(--brand) 35%, transparent);
}
.banner-slider {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.banner-track { display: flex; transition: transform 0.45s ease; }
.banner-item {
  min-width: 100%;
  padding: 1.5rem 1.35rem;
  background: transparent;
}
.banner-item h3 { margin: 0 0 0.35rem; font-family: var(--font-display); }
.banner-item p { margin: 0; color: var(--ink-soft); }
.banner-dots { display: flex; gap: 0.4rem; padding: 0 1.2rem 1rem; }
.banner-dots button {
  width: 1.5rem;
  height: 2px;
  border: 0;
  background: var(--line);
  cursor: pointer;
  padding: 0;
}
.banner-dots button.active { background: var(--copper); }

/* Admin */
.admin-body { background: var(--page-wash); color: var(--ink); font-family: var(--font-body); }
.admin-layout { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.admin-side { border-right: 1px solid var(--line); padding: 1.2rem; background: var(--panel); }
.admin-side a {
  display: block;
  padding: 0.6rem 0.55rem;
  color: var(--ink-soft);
  border-radius: var(--radius);
  margin-bottom: 0.2rem;
}
.admin-side a.active,
.admin-side a:hover { background: var(--paper-2); color: var(--ink); }
.admin-main { padding: 1.4rem; }
.admin-toolbar { display: flex; justify-content: flex-end; margin-bottom: 0.8rem; }
.table { width: 100%; border-collapse: collapse; }
.table th,
.table td {
  border-bottom: 1px solid var(--line);
  padding: 0.7rem 0.35rem;
  text-align: left;
  font-size: 0.92rem;
}
.table th { color: var(--ink-soft); }

@media (max-width: 1100px) {
  .nav-links { display: none; }
  .nav-desktop-only { display: none !important; }
  .menu-toggle { display: inline-flex; }
  .mobile-panel:not([hidden]) { display: block; }
  .support-band,
  .loop-track,
  .mile-row,
  .stage-grid,
  .stats { grid-template-columns: repeat(2, 1fr); }
  .support-cell:nth-child(2) { border-right: 0; }
  .support-cell:nth-child(1),
  .support-cell:nth-child(2) { border-bottom: 1px solid var(--line); }
  .loop-step:nth-child(5) { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .container { width: min(100% - 1.35rem, var(--max)); }
  .hero {
    min-height: auto;
    padding: 5.5rem 0 3rem;
    align-items: flex-end;
  }
  .hero-brand { font-size: clamp(1.85rem, 9vw, 2.6rem); }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .section { padding: 3rem 0; }
  .focus-item { grid-template-columns: 1fr; gap: 0.35rem; }
  .focus-item .go { justify-self: start; }
  .support-band,
  .loop-track,
  .mile-row,
  .stage-grid,
  .stats,
  .footer-grid { grid-template-columns: 1fr; }
  .support-cell { border-right: 0; border-bottom: 1px solid var(--line); }
  .support-cell:last-child { border-bottom: 0; }
  .admin-layout { grid-template-columns: 1fr; }
  .admin-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .form-card { margin: 1rem 0; max-width: none; }
}