:root {
  --blue-900: #0A2C4E;
  --blue-800: #0E3D6E;
  --blue-700: #104A88;
  --blue-500: #1E6FB8;
  --blue-b: #2E7BC0;
  --gold: #C9A257;
  --ink: #16202B;
  --muted: #5B6B7B;
  --bg: #F6F8FA;
  --card: #FFFFFF;
  --line: #E4EAEF;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(10, 44, 78, .08);
  --shadow-lg: 0 18px 50px rgba(10, 44, 78, .16);
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ============ Header ============ */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s;
}
.header.scrolled { box-shadow: 0 4px 20px rgba(10,44,78,.10); }
.header-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; gap: 32px;
}
.logo img { height: 34px; width: auto; }
.nav { display: flex; gap: 28px; margin-left: auto; }
.nav a {
  font-size: 14.5px; font-weight: 600; color: var(--ink);
  padding: 6px 0; position: relative; letter-spacing: .2px;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--gold); transition: width .25s;
}
.nav a:hover::after { width: 100%; }
.header-actions { display: flex; align-items: center; gap: 14px; }

.lang-switch {
  display: flex; border: 1.5px solid var(--blue-700); border-radius: 999px;
  overflow: hidden; font-size: 13px; font-weight: 700;
}
.lang-switch button {
  border: none; background: transparent; cursor: pointer;
  padding: 6px 14px; color: var(--blue-700); font: inherit;
}
.lang-switch button.active { background: var(--blue-700); color: #fff; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 700; font-size: 14.5px;
  transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; border: none;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-primary { background: var(--blue-700); color: #fff; }
.btn-primary:hover { background: var(--blue-800); }
.btn-gold { background: var(--gold); color: #fff; }
.btn-outline { border: 1.5px solid rgba(255,255,255,.7); color: #fff; background: transparent; }
.btn-outline:hover { background: rgba(255,255,255,.12); }
.btn-sm { padding: 9px 18px; font-size: 13.5px; }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; }
.menu-toggle span { display: block; width: 24px; height: 2.5px; background: var(--ink); margin: 5px 0; border-radius: 2px; }

/* ============ Hero ============ */
.hero {
  position: relative; min-height: 92vh; display: flex; align-items: center;
  background: url("../img/hero.jpg") center 40% / cover no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(6,26,48,.88) 0%, rgba(8,34,62,.55) 45%, rgba(10,44,78,.15) 100%);
}
.hero-inner { position: relative; z-index: 2; max-width: var(--max); margin: 0 auto; padding: 120px 24px 80px; color: #fff; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase;
  color: #EAD7AE; margin-bottom: 22px;
}
.hero-eyebrow::before { content: ""; width: 34px; height: 2px; background: var(--gold); }
.hero h1 {
  font-size: clamp(38px, 5.6vw, 66px); line-height: 1.12; font-weight: 800;
  max-width: 820px; letter-spacing: -.5px; margin-bottom: 22px;
}
.hero h1 em { font-style: normal; color: #F0C97D; }
.hero p { font-size: clamp(16px, 1.6vw, 19px); max-width: 640px; color: rgba(255,255,255,.88); margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ============ Stats ============ */
.stats { background: var(--blue-900); color: #fff; padding: 58px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat { text-align: center; position: relative; }
.stat + .stat::before {
  content: ""; position: absolute; left: -14px; top: 12%; height: 76%;
  width: 1px; background: rgba(255,255,255,.16);
}
.stat .num { font-size: clamp(34px, 3.6vw, 46px); font-weight: 800; color: #F0C97D; line-height: 1.1; }
.stat .num span { font-size: .55em; font-weight: 700; }
.stat .label { margin-top: 8px; font-size: 14.5px; color: rgba(255,255,255,.78); }

/* ============ Section base ============ */
.section { padding: 96px 0; }
.section.alt { background: #fff; }
.section-head { max-width: 760px; margin-bottom: 52px; }
.eyebrow {
  display: inline-block; font-size: 12.5px; font-weight: 800; letter-spacing: 3px;
  text-transform: uppercase; color: var(--blue-500); margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(30px, 3.4vw, 42px); font-weight: 800; letter-spacing: -.4px; line-height: 1.18; }
.section-head p { margin-top: 16px; color: var(--muted); font-size: 16.5px; }

/* ============ About ============ */
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.about-text h2 { font-size: clamp(30px, 3.4vw, 42px); font-weight: 800; letter-spacing: -.4px; line-height: 1.18; margin-bottom: 20px; }
.about-text p { color: var(--muted); font-size: 16px; margin-bottom: 16px; }
.about-points { margin-top: 26px; display: grid; gap: 14px; }
.about-points li { list-style: none; display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; }
.about-points li svg { flex: none; margin-top: 4px; }
.about-media { position: relative; }
.about-media img { border-radius: var(--radius); box-shadow: var(--shadow-lg); width: 100%; height: 480px; object-fit: cover; }
.about-badge {
  position: absolute; left: -28px; bottom: 34px;
  background: var(--blue-900); color: #fff; padding: 20px 26px; border-radius: 12px;
  box-shadow: var(--shadow-lg); max-width: 300px;
}
.about-badge .num { font-size: 30px; font-weight: 800; color: #F0C97D; }
.about-badge .desc { font-size: 13px; color: rgba(255,255,255,.8); margin-top: 4px; }

/* ============ Services ============ */
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.svc-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 28px; transition: transform .25s, box-shadow .25s; position: relative; overflow: hidden;
}
.svc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.svc-card .idx {
  font-size: 44px; font-weight: 800; color: transparent;
  -webkit-text-stroke: 1.4px rgba(30,111,184,.4); line-height: 1;
}
.svc-card h3 { margin: 18px 0 10px; font-size: 19px; font-weight: 800; }
.svc-card p { color: var(--muted); font-size: 14.5px; }
.svc-card::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 3px; width: 0;
  background: var(--gold); transition: width .3s;
}
.svc-card:hover::after { width: 100%; }

/* ============ Advantages ============ */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.adv-card {
  border-radius: var(--radius); padding: 32px 28px; color: #fff; position: relative;
  background: linear-gradient(150deg, var(--blue-800), var(--blue-500));
  transition: transform .25s;
}
.adv-card:hover { transform: translateY(-6px); }
.adv-card.dark { background: linear-gradient(150deg, #132F4C, #0A2C4E); }
.adv-card svg { margin-bottom: 18px; }
.adv-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 10px; }
.adv-card p { font-size: 14px; color: rgba(255,255,255,.82); }

/* ============ Projects ============ */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-bar button {
  border: 1.5px solid var(--line); background: #fff; color: var(--muted);
  padding: 9px 20px; border-radius: 999px; font-size: 13.5px; font-weight: 700; cursor: pointer;
  transition: all .2s;
}
.filter-bar button:hover { border-color: var(--blue-500); color: var(--blue-500); }
.filter-bar button.active { background: var(--blue-700); border-color: var(--blue-700); color: #fff; }

.proj-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.proj-card {
  background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  transition: transform .25s, box-shadow .25s; display: flex; flex-direction: column;
}
.proj-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.proj-media { position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.proj-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.proj-card:hover .proj-media img { transform: scale(1.06); }
.proj-tag {
  position: absolute; top: 14px; left: 14px; background: rgba(10,44,78,.85); color: #fff;
  font-size: 11.5px; font-weight: 700; letter-spacing: .6px; padding: 5px 12px; border-radius: 999px;
  backdrop-filter: blur(4px);
}
.proj-status {
  position: absolute; top: 14px; right: 14px; font-size: 11.5px; font-weight: 700;
  padding: 5px 12px; border-radius: 999px; backdrop-filter: blur(4px);
}
.status-done { background: rgba(201,162,87,.92); color: #fff; }
.status-ongoing { background: rgba(46,123,192,.92); color: #fff; }
.proj-body { padding: 20px 22px 24px; }
.proj-body h3 { font-size: 17.5px; font-weight: 800; line-height: 1.3; }
.proj-body .loc { color: var(--muted); font-size: 13.5px; margin-top: 6px; display: flex; align-items: center; gap: 6px; }
.proj-meta { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.proj-meta span {
  font-size: 12px; font-weight: 700; color: var(--blue-700);
  background: rgba(30,111,184,.09); padding: 4px 10px; border-radius: 6px;
}

.proj-more { margin-top: 40px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.more-label { font-weight: 800; font-size: 14px; color: var(--blue-700); letter-spacing: .5px; }
.more-chips { display: flex; gap: 10px; flex-wrap: wrap; }
.more-chips span {
  font-size: 13px; font-weight: 600; color: var(--muted);
  border: 1.5px solid var(--line); background: #fff; padding: 7px 16px; border-radius: 999px;
}

/* ============ Management ============ */
.mgmt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.mgmt-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; display: flex; gap: 18px; align-items: flex-start;
  transition: transform .25s, box-shadow .25s;
}
.mgmt-item:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.mgmt-icon {
  flex: none; width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(150deg, var(--blue-800), var(--blue-500));
  display: grid; place-items: center;
}
.mgmt-item h3 { font-size: 16.5px; font-weight: 800; margin-bottom: 6px; }
.mgmt-item p { font-size: 14px; color: var(--muted); }
.mgmt-note {
  margin-top: 30px; background: var(--blue-900); color: #fff; border-radius: var(--radius);
  padding: 26px 30px; display: flex; gap: 16px; align-items: center; font-size: 15px;
}
.mgmt-note svg { flex: none; }

/* ============ Contact ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; }
.contact-info h2 { font-size: clamp(30px, 3.4vw, 42px); font-weight: 800; margin-bottom: 18px; letter-spacing: -.4px; }
.contact-info > p { color: var(--muted); margin-bottom: 30px; font-size: 16px; }
.contact-list { display: grid; gap: 18px; }
.contact-list li { list-style: none; display: flex; gap: 14px; align-items: flex-start; font-size: 15px; }
.contact-list .c-label { font-weight: 800; font-size: 13px; color: var(--blue-700); text-transform: uppercase; letter-spacing: 1px; }
.contact-list .c-val { color: var(--muted); margin-top: 2px; }

.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px 34px; box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 20px; font-weight: 800; margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.contact-form input, .contact-form textarea {
  width: 100%; border: 1.5px solid var(--line); border-radius: 10px; padding: 13px 16px;
  font: inherit; font-size: 14.5px; color: var(--ink); background: var(--bg);
  transition: border .2s;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--blue-500); }
.contact-form textarea { min-height: 130px; resize: vertical; margin-bottom: 20px; }

/* ============ Footer ============ */
.footer { background: var(--blue-900); color: rgba(255,255,255,.75); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 46px; }
.footer .logo img { height: 30px; margin-bottom: 16px; }
.footer p { font-size: 14px; max-width: 340px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; letter-spacing: .5px; }
.footer ul { list-style: none; display: grid; gap: 10px; font-size: 14px; }
.footer ul a:hover { color: #F0C97D; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding: 20px 0;
  font-size: 13px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}

/* ============ Reveal animation ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .cards-4, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .proj-grid { grid-template-columns: repeat(2, 1fr); }
  .mgmt-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat + .stat::before { display: none; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .about-media img { height: 380px; }
  .about-badge { left: 16px; }
}
@media (max-width: 720px) {
  .nav {
    position: fixed; top: 72px; left: 0; right: 0; background: #fff;
    flex-direction: column; gap: 0; padding: 12px 24px 20px; border-bottom: 1px solid var(--line);
    display: none; box-shadow: var(--shadow-lg);
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 0; font-size: 16px; }
  .menu-toggle { display: block; margin-left: auto; }
  .header-actions { margin-left: 0; }
  .header-inner { gap: 14px; }
  .proj-grid, .mgmt-grid, .cards-4, .adv-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .hero-inner { padding: 110px 24px 60px; }
}