:root {
  --bg: #f3f6f9;
  --bg-alt: #e8eef4;
  --surface: #ffffff;
  --ink: #152033;
  --muted: #5b6b7f;
  --line: #d5dee8;
  --accent: #0f5e8a;
  --accent-deep: #0a3f5f;
  --accent-soft: rgba(15, 94, 138, 0.12);
  --shadow: 0 18px 40px rgba(21, 32, 51, 0.08);
  --radius: 16px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(15, 94, 138, 0.12), transparent 60%),
    radial-gradient(900px 420px at 90% 0%, rgba(10, 63, 95, 0.08), transparent 55%),
    linear-gradient(180deg, #f7fafc 0%, var(--bg) 45%, #eef3f7 100%);
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1100px, calc(100% - 2.5rem));
  margin: 0 auto;
}

.container.narrow {
  width: min(820px, calc(100% - 2.5rem));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(247, 250, 252, 0.86);
  border-bottom: 1px solid rgba(213, 222, 232, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-mark {
  width: 14px;
  height: 42px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-text strong {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.brand-text span {
  color: var(--muted);
  font-size: 0.85rem;
}

.nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 500;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 3.5rem 0 4rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.lead {
  margin: 0 0 1.75rem;
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.25rem;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: 0 10px 24px rgba(15, 94, 138, 0.25);
}

.btn-secondary {
  color: var(--accent-deep);
  background: var(--surface);
  border: 1px solid var(--line);
}

.hero-panel {
  position: relative;
  height: min(420px, 55vw);
  border-radius: var(--radius);
  overflow: hidden;
  background:
    linear-gradient(145deg, #0f5e8a 0%, #0a3f5f 55%, #16324a 100%);
  box-shadow: var(--shadow);
}

.grid-glow {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 30%, transparent 78%);
  animation: drift 12s linear infinite;
}

.orbit {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.orbit-a {
  width: 58%;
  height: 58%;
  animation: spin 18s linear infinite;
}

.orbit-b {
  width: 78%;
  height: 78%;
  animation: spin 26s linear infinite reverse;
}

.core {
  position: absolute;
  width: 18%;
  height: 18%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #ffffff, #7eb7d8 45%, #0f5e8a 100%);
  box-shadow: 0 0 40px rgba(126, 183, 216, 0.55);
  animation: pulse 3.2s ease-in-out infinite;
}

.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.55);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.6rem, 2.5vw, 2rem);
}

.section-desc,
#about-text {
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.meta-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0;
}

.meta-list > div {
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.meta-list dt {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.meta-list dd {
  margin: 0;
  font-weight: 600;
  word-break: break-all;
}

.tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.tech-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem 1.35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.tech-list li:hover {
  border-color: rgba(15, 94, 138, 0.35);
  transform: translateY(-2px);
}

.tech-index {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.tech-text {
  color: var(--ink);
  font-weight: 500;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.contact-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.contact-list span {
  color: var(--muted);
}

.contact-list strong,
.contact-list a {
  font-weight: 600;
  color: var(--ink);
  text-align: right;
}

.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  color: var(--muted);
}

.footer-inner a:hover {
  color: var(--accent);
}

@keyframes drift {
  from { background-position: 0 0, 0 0; }
  to { background-position: 36px 36px, 36px 36px; }
}

@keyframes spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.08); opacity: 0.9; }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2.5rem;
  }

  .hero-panel {
    order: -1;
    height: 240px;
  }

  .meta-list,
  .tech-list {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .contact-list li {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-list strong,
  .contact-list a {
    text-align: left;
  }
}