:root {
  --color-text: #000000;
  --color-text-secondary: #454545;
  --color-muted: #828282;
  --color-border: #e6e6e6;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f7;
  --radius: 8px;
  --spacing-xs: 8px;
  --spacing-s: 24px;
  --spacing-sm: 32px;
  --spacing-m: 48px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

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

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

/* Header */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.main-nav {
  display: flex;
  align-items: center;
}

.main-nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 40px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  font-weight: 500;
  color: var(--color-text);
}

.main-nav a.active {
  font-weight: 600;
}

.main-nav a:hover {
  color: var(--color-muted);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
}

.btn-primary {
  background: #000000;
  color: #ffffff;
}

.btn-primary:hover {
  background: #262626;
}

.btn-secondary {
  background: var(--color-border);
  color: #000000;
}

.btn-secondary:hover {
  background: #d9d9d9;
}

/* Hero */
.hero {
  padding: 56px 0 0;
}

.hero-copy {
  max-width: 850px;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(0, 0, 0, 0.75);
  margin: 0 0 24px;
}

.hero-image {
  border-radius: var(--radius);
  overflow: hidden;
  height: 480px;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Sections */
.section-title {
  font-size: 2.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 40px;
}

.section {
  padding: 80px 0;
}

/* Program studi & pilihan kelas cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.media-card-image {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3.4;
  margin-bottom: 20px;
}

.media-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-card h3 {
  font-size: 1.4rem;
  font-weight: 500;
  margin: 0 0 4px;
}

.media-card p {
  color: var(--color-muted);
  margin: 0;
}

.pilihan-kelas-grid .media-card-image {
  aspect-ratio: 16 / 9.5;
}

/* Tentang */
.tentang-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.tentang-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-m);
}

.tentang-text h3 {
  font-size: 1.4rem;
  font-weight: 500;
  margin: 0 0 8px;
}

.tentang-text p {
  color: var(--color-muted);
  margin: 0;
}

.tentang-buttons {
  display: flex;
  gap: 16px;
  margin-top: var(--spacing-m);
}

.tentang-image {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.tentang-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Dosen */
.dosen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-sm);
}

.dosen-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-sm) var(--spacing-sm) 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-m);
  text-align: center;
}

.dosen-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
}

.dosen-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.dosen-card h3 {
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0;
}

/* Page header (inner pages) */
.page-header {
  background: var(--color-bg-alt);
  padding: 50px 0;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin: 0;
}

.content-section {
  padding: 60px 0;
}

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

/* Contact page */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 50px;
}

.contact-form {
  display: flex;
  flex-direction: column;
}

.contact-form label {
  font-weight: 600;
  margin-top: 14px;
  margin-bottom: 6px;
}

.contact-form input,
.contact-form textarea {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
}

.contact-form button {
  margin-top: 20px;
  align-self: flex-start;
}

/* Footer */
.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-m) 0 0;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  padding-bottom: var(--spacing-sm);
}

.footer-brand {
  font-size: 1.5rem;
}

.footer-columns {
  display: flex;
  gap: var(--spacing-m);
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-s);
  min-width: 140px;
}

.footer-col a {
  color: var(--color-text-secondary);
}

.footer-col a:first-child {
  color: var(--color-text);
  font-weight: 500;
}

.footer-col a:hover {
  color: var(--color-text);
}

.social-icons {
  display: flex;
  gap: var(--spacing-xs);
  padding: var(--spacing-s) 0;
}

.social-icons a {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-icons img {
  width: 24px;
  height: 24px;
}

.footer-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
}

.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .tentang-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .main-nav ul {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav ul.open {
    display: flex;
  }

  .contact-section {
    grid-template-columns: 1fr;
  }

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