/* 沈阳兴华源电力工程设计有限公司 — 极简工程院风格，无动效依赖 */

:root {
  --navy-900: #0a1628;
  --navy-800: #0f2744;
  --navy-700: #153a5c;
  --navy-600: #1e4d7b;
  --text: #1a2332;
  --muted: #4a5568;
  --border: #d4dbe5;
  --surface: #ffffff;
  --bg: #f0f3f8;
  --header-h: 56px;
  /* 正方形 logo：顶栏内边距下建议 32–38px，过大易成「红方块」抢导航 */
  --logo-size: 36px;
  --radius: 4px;
  --max: 920px;
  --max-wide: 960px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

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

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--navy-600);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--navy-700);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--navy-900);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 10px 18px 12px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  min-width: 0;
}

.brand-link:hover {
  color: #e2e8f0;
  text-decoration: none;
}

/* 正方形 logo：不使用圆角，避免四角弧边裁切或遮挡图形主体 */
.brand-mark {
  width: var(--logo-size);
  height: var(--logo-size);
  min-width: var(--logo-size);
  object-fit: contain;
  flex-shrink: 0;
  display: block;
  border-radius: 0;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.brand-text {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  justify-content: flex-end;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.8125rem;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover {
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

.hero {
  padding: 56px 18px 48px;
  background: linear-gradient(165deg, var(--navy-800) 0%, var(--navy-900) 55%);
  color: #e8eef5;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.hero-kicker {
  margin: 0 0 10px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.55);
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  font-weight: 700;
  line-height: 1.35;
  color: #fff;
}

.hero-tagline {
  margin: 0 0 28px;
  font-size: 1.02rem;
  line-height: 1.7;
  color: rgba(232, 238, 245, 0.92);
  max-width: 40rem;
}

.hero-tagline strong {
  color: #fff;
  font-weight: 600;
}

.hero-facts {
  margin: 0;
  max-width: 28rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
}

.hero-fact-row {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 8px 16px;
  margin-bottom: 12px;
}

.hero-fact-row:last-child {
  margin-bottom: 0;
}

.hero-facts dt {
  margin: 0;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
}

.hero-facts dd {
  margin: 0;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.95);
}

.section {
  padding: 44px 18px;
}

.section-surface {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
}

.section-inner.narrow {
  max-width: var(--max);
}

.section h2 {
  margin: 0 0 20px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-800);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--navy-600);
  display: inline-block;
  min-width: min(100%, 12rem);
}

.sub-block {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.sub-block:first-of-type {
  margin-top: 28px;
  padding-top: 0;
  border-top: none;
}

.sub-block h3 {
  margin: 0 0 14px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy-700);
}

.prose {
  margin: 0;
}

.prose p {
  margin: 0 0 14px;
  color: var(--text);
  max-width: 52rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.content-list {
  margin: 0 0 16px;
  padding-left: 1.2rem;
  color: var(--text);
}

.content-list:last-child {
  margin-bottom: 0;
}

.content-list li {
  margin-bottom: 10px;
  padding-left: 2px;
}

.content-list li:last-child {
  margin-bottom: 0;
}

.partner-names {
  margin-top: 8px;
  margin-bottom: 20px;
}

.vision-block p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 28px 18px;
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.8125rem;
  text-align: center;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.site-footer p {
  margin: 0 0 6px;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.footer-meta {
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.75rem;
}

@media (max-width: 640px) {
  .hero-fact-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .site-nav a {
    font-size: 0.78rem;
  }

  .section {
    padding: 36px 16px;
  }
}

@media (max-width: 480px) {
  .site-nav ul {
    gap: 8px 10px;
  }

  .site-nav a {
    white-space: normal;
  }

  :root {
    --logo-size: 32px;
  }

  .brand-text {
    font-size: 0.875rem;
  }
}