* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

:root {
  --primary: #1f2a44;
  --green: #2e7d32;
  --green-light: #4caf50;
  --blue: #1e88e5;
  --bg: #f5f7fa;
  --white: #ffffff;
  --text: #58657d;
  --dark: #111827;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius: 18px;
}

body {
  background: var(--bg);
  color: var(--primary);
  line-height: 1.6;
}

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

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

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

header {
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  gap: 20px;
}

.logo img {
  height: 72px;
  width: auto;
  display: block;
}

nav ul {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  flex-wrap: wrap;
}

nav ul li a {
  font-weight: 600;
  color: var(--primary);
  transition: 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--green);
}

.btn {
  display: inline-block;
  padding: 14px 26px;
  border-radius: 8px;
  font-weight: 700;
  transition: 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
}

.btn-primary:hover {
  background: #1669b1;
}

.btn-secondary {
  background: var(--green);
  color: var(--white);
}

.btn-secondary:hover {
  background: #246428;
}

.hero-small {
  background:
    linear-gradient(to right, rgba(245, 247, 250, 0.96) 38%, rgba(245, 247, 250, 0.30)),
    url('../images/hero-siat.png') center/cover no-repeat;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 720px;
  padding: 90px 0;
}

.breadcrumb {
  display: inline-block;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 18px;
  background: rgba(255,255,255,0.70);
  padding: 8px 14px;
  border-radius: 30px;
}

.hero-content h1,
.hero-content h2 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--primary);
}

.hero-content p {
  font-size: 1.12rem;
  margin-bottom: 28px;
  color: #334155;
  max-width: 680px;
}

section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2.4rem;
  color: var(--primary);
  margin-bottom: 15px;
}

.section-subtitle,
.section-sub {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 48px;
  color: var(--text);
  font-size: 1.04rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.info-box,
.card-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
}

.info-box h3,
.card-box h3 {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.info-box p,
.card-box p {
  color: var(--text);
  margin-bottom: 14px;
}

.info-box ul,
.card-box ul {
  padding-left: 18px;
  color: #334155;
}

.info-box ul li,
.card-box ul li {
  margin-bottom: 10px;
}

.feature-image img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  object-fit: cover;
}

.tech-grid,
.card-grid,
.program-grid,
.gallery-grid,
.news-grid,
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.tech-card,
.program-card,
.gallery-card,
.news-card,
.value-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: 0.3s ease;
}

.tech-card:hover,
.program-card:hover,
.gallery-card:hover,
.news-card:hover,
.value-card:hover {
  transform: translateY(-6px);
}

.tech-card img,
.program-card img,
.gallery-card img,
.news-card img {
  width: 100%;
  height: 230px;
  object-fit: cover;
}

.tech-body,
.program-body,
.gallery-body,
.news-body {
  padding: 24px;
}

.tech-tag,
.program-tag,
.news-tag {
  display: inline-block;
  background: #eaf5ec;
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 7px 12px;
  border-radius: 20px;
  margin-bottom: 14px;
}

.tech-body h3,
.program-body h3,
.news-body h3,
.value-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  line-height: 1.3;
  color: var(--primary);
}

.tech-body p,
.program-body p,
.news-body p,
.value-card p {
  color: var(--text);
  font-size: 0.98rem;
  margin-bottom: 14px;
}

.tech-body ul,
.program-body ul {
  padding-left: 18px;
  color: #334155;
}

.tech-body ul li,
.program-body ul li {
  margin-bottom: 8px;
  font-size: 0.94rem;
}

.stats {
  background: var(--primary);
  color: var(--white);
}

.stats .section-title,
.stats .section-subtitle,
.stats .section-sub {
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.stat-box {
  background: rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 28px 18px;
  text-align: center;
}

.stat-box h3 {
  font-size: 2.3rem;
  color: var(--green-light);
  margin-bottom: 8px;
}

.cta {
  background: linear-gradient(135deg, var(--green), var(--blue));
  color: var(--white);
  text-align: center;
  border-radius: 24px;
  padding: 60px 30px;
  box-shadow: var(--shadow);
}

.cta h2 {
  font-size: 2.3rem;
  margin-bottom: 16px;
}

.cta p {
  max-width: 780px;
  margin: 0 auto 26px;
  font-size: 1.04rem;
}

footer {
  background: var(--dark);
  color: #d1d5db;
  padding: 50px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 30px;
  margin-bottom: 30px;
}

footer h3,
footer h4 {
  color: var(--white);
  margin-bottom: 15px;
}

footer ul {
  list-style: none;
}

footer ul li {
  margin-bottom: 10px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 18px;
  text-align: center;
  font-size: 0.95rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

form input,
form textarea {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 16px;
  border: 1px solid #d7dee8;
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
}

form textarea {
  min-height: 140px;
  resize: vertical;
}

.caption,
.date {
  color: var(--text);
  font-size: 0.95rem;
}

.hidden {
  display: none !important;
}

@media (max-width: 1024px) {
  .tech-grid,
  .card-grid,
  .program-grid,
  .gallery-grid,
  .news-grid,
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .two-col,
  .footer-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-content h1,
  .hero-content h2 {
    font-size: 2.7rem;
  }
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  nav ul {
    gap: 14px;
  }

  .tech-grid,
  .card-grid,
  .program-grid,
  .gallery-grid,
  .news-grid,
  .values-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-small {
    background:
      linear-gradient(to bottom, rgba(245,247,250,0.96), rgba(245,247,250,0.88)),
      url('../images/hero-siat.png') center/cover no-repeat;
    min-height: auto;
  }

  .hero-content {
    padding: 70px 0;
  }

  .hero-content h1,
  .hero-content h2 {
    font-size: 2.15rem;
  }

  .section-title {
    font-size: 2rem;
  }
}