:root {
  --bg: #0b1520;
  --bg-elevated: #122033;
  --bg-soft: #162a40;
  --text: #e8eef5;
  --text-muted: #9bb0c5;
  --accent: #2ec4b6;
  --accent-strong: #1fa896;
  --accent-soft: rgba(46, 196, 182, 0.14);
  --line: rgba(232, 238, 245, 0.12);
  --white: #ffffff;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius: 14px;
  --container: 1120px;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Outfit", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(46, 196, 182, 0.16), transparent 60%),
    radial-gradient(900px 500px at 0% 20%, rgba(56, 120, 180, 0.18), transparent 55%),
    var(--bg);
  line-height: 1.7;
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

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

button,
input,
textarea {
  font: inherit;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(11, 21, 32, 0.82);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--accent), #3a8fd6);
  color: #062018;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.brand-text {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--white);
  background: var(--accent-soft);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}

/* Hero */
.hero {
  position: relative;
  min-height: min(92vh, 760px);
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(11, 21, 32, 0.15) 0%, rgba(11, 21, 32, 0.88) 72%, var(--bg) 100%),
    linear-gradient(120deg, rgba(20, 48, 72, 0.9), rgba(12, 28, 42, 0.55)),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1600' height='900' viewBox='0 0 1600 900'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='1' y2='1'%3E%3Cstop stop-color='%231a3a55'/%3E%3Cstop offset='1' stop-color='%230d1c2a'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='1600' height='900' fill='url(%23g)'/%3E%3Cpath d='M0 620 Q400 480 800 600 T1600 520 V900 H0Z' fill='%230b1520' opacity='.55'/%3E%3Ccircle cx='1180' cy='220' r='180' fill='%232ec4b6' opacity='.12'/%3E%3Ccircle cx='340' cy='180' r='120' fill='%233a8fd6' opacity='.14'/%3E%3C/svg%3E") center / cover no-repeat;
  animation: heroPulse 12s ease-in-out infinite alternate;
}

@keyframes heroPulse {
  from { transform: scale(1); }
  to { transform: scale(1.04); }
}

.hero-content {
  padding: 7rem 0 5rem;
}

.brand-hero {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.05;
  background: linear-gradient(90deg, #ffffff, #9fe8df 55%, #7eb8ea);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fadeUp 0.8s ease both;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero-lead {
  max-width: 34rem;
  margin: 1rem 0 1.75rem;
  color: var(--text-muted);
  font-size: 1.05rem;
  animation: fadeUp 0.9s ease 0.08s both;
}

.hero h1 {
  animation: fadeUp 0.85s ease 0.04s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  animation: fadeUp 1s ease 0.12s both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 500;
  transition: transform 0.2s, background 0.2s, border-color 0.2s, color 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #062018;
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-ghost,
.btn-outline {
  border-color: var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover,
.btn-outline:hover {
  border-color: rgba(46, 196, 182, 0.45);
  background: var(--accent-soft);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section.alt {
  background: rgba(18, 32, 51, 0.55);
}

.section-head {
  margin-bottom: 2.5rem;
  max-width: 40rem;
}

.section-head h2,
.prose-block h2,
.contact-info h2,
.contact-form h2,
.news-col h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
}

.section-head p,
.page-hero p {
  margin: 0;
  color: var(--text-muted);
}

.section-more {
  margin-top: 2rem;
}

.page-hero {
  padding: 4.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(46, 196, 182, 0.08), transparent 70%);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  letter-spacing: 0.18em;
  font-size: 0.82rem;
  text-transform: uppercase;
}

/* Services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.service-item {
  padding: 1.5rem 1.25rem;
  border-top: 1px solid rgba(46, 196, 182, 0.35);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent);
  transition: background 0.25s, transform 0.25s;
}

.service-item:hover {
  transform: translateY(-4px);
  background: linear-gradient(180deg, rgba(46, 196, 182, 0.1), transparent);
}

.service-num {
  display: block;
  margin-bottom: 1.2rem;
  font-family: var(--font-display);
  color: var(--accent);
  letter-spacing: 0.08em;
}

.service-item h3,
.case-tile h3,
.culture-grid h3,
.news-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
}

.service-item p,
.case-tile p,
.culture-grid p,
.news-card p,
.about-copy p,
.prose-block p {
  margin: 0;
  color: var(--text-muted);
}

/* Cases */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.case-page {
  grid-template-columns: repeat(3, 1fr);
}

.case-tile {
  display: block;
  overflow: hidden;
}

.case-visual {
  height: 200px;
  margin-bottom: 0.9rem;
  border-radius: var(--radius);
  background-size: cover;
  background-position: center;
  transition: transform 0.35s ease;
}

.case-tile:hover .case-visual {
  transform: scale(1.03);
}

.v1 { background: linear-gradient(135deg, #1d4e63, #2ec4b6 70%); }
.v2 { background: linear-gradient(135deg, #243b55, #5b8db8 70%); }
.v3 { background: linear-gradient(135deg, #2a3f4f, #78c2b0 70%); }
.v4 { background: linear-gradient(135deg, #1f3550, #3d7ea6 70%); }
.v5 { background: linear-gradient(135deg, #22384a, #89a8b8 70%); }
.v6 { background: linear-gradient(135deg, #254352, #4db6ac 70%); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.75rem;
}

.filter-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  cursor: pointer;
  transition: 0.2s;
}

.filter-btn.active,
.filter-btn:hover {
  color: var(--white);
  border-color: rgba(46, 196, 182, 0.5);
  background: var(--accent-soft);
}

.case-tile.is-hidden {
  display: none;
}

/* About */
.about-strip {
  background: linear-gradient(120deg, rgba(30, 70, 90, 0.45), rgba(18, 32, 51, 0.8));
}

.about-strip-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: center;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.about-facts div {
  text-align: center;
  padding: 1.2rem 0.5rem;
  border-left: 1px solid var(--line);
}

.about-facts strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--accent);
}

.about-facts span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.text-link {
  display: inline-block;
  margin-top: 1.2rem;
  color: var(--accent);
}

.prose-block {
  max-width: 720px;
}

.prose-block p + p {
  margin-top: 1rem;
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.culture-grid article {
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

/* News */
.news-list {
  display: grid;
  gap: 0.35rem;
}

.news-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s, padding-left 0.2s;
}

.news-row:hover {
  color: var(--accent);
  padding-left: 0.35rem;
}

.news-row time {
  color: var(--text-muted);
}

.news-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.news-card {
  display: block;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.news-card time {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.news-card:hover h3 {
  color: var(--accent);
}

/* Contact */
.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-info dl {
  margin: 1.5rem 0 0;
}

.contact-info dl > div {
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}

.contact-info dt {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.contact-info dd {
  margin: 0;
}

.contact-form {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 32, 51, 0.55);
}

.contact-form label {
  display: grid;
  gap: 0.4rem;
  margin: 0.9rem 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(11, 21, 32, 0.7);
  color: var(--text);
  padding: 0.75rem 0.9rem;
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(46, 196, 182, 0.55);
}

.form-note {
  margin: 1rem 0 0;
  color: var(--accent);
}

/* CTA + Footer */
.cta-band {
  padding: 4rem 0;
  text-align: center;
  background:
    radial-gradient(600px 200px at 50% 0%, rgba(46, 196, 182, 0.18), transparent 70%),
    var(--bg-elevated);
  border-block: 1px solid var(--line);
}

.cta-band h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
}

.cta-band p {
  margin: 0 0 1.4rem;
  color: var(--text-muted);
}

.site-footer {
  padding: 3rem 0 1.5rem;
  background: #08101a;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 1.5rem;
}

.site-footer h4 {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
}

.site-footer a,
.site-footer p {
  display: block;
  margin: 0.35rem 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

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

.brand-footer {
  margin-bottom: 0.8rem;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
}

.footer-bottom p {
  margin: 0;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Responsive */
@media (max-width: 960px) {
  .service-grid,
  .culture-grid,
  .news-columns,
  .case-page {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-strip-inner,
  .contact-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .about-facts div {
    border-left: none;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 72px;
    flex-direction: column;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(11, 21, 32, 0.96);
  }

  .site-nav.open {
    display: flex;
  }

  .service-grid,
  .culture-grid,
  .news-columns,
  .case-grid,
  .case-page,
  .about-facts {
    grid-template-columns: 1fr;
  }

  .news-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .hero-content {
    padding-top: 5.5rem;
  }

  .footer-bottom {
    flex-direction: column;
  }
}