/* ============================================
   RUST University — Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Source+Serif+4:wght@400;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  --primary: #0B1D3A;
  --primary-light: #132D5E;
  --secondary: #00A878;
  --secondary-light: #00C48C;
  --accent: #E8A838;
  --accent-light: #F5C563;
  --white: #FFFFFF;
  --gray-50: #F8FAFB;
  --gray-100: #EEF1F5;
  --gray-200: #D8DDE6;
  --gray-300: #B0B8C9;
  --gray-400: #7A8599;
  --gray-500: #4E5668;
  --gray-600: #343A48;
  --dark: #0A0F1A;
  --danger: #E74C3C;
  --success: #27AE60;
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
  --gradient-hero: linear-gradient(135deg, rgba(11,29,58,0.92) 0%, rgba(0,168,120,0.75) 100%);
  --shadow-sm: 0 2px 8px rgba(11,29,58,0.06);
  --shadow-md: 0 4px 20px rgba(11,29,58,0.10);
  --shadow-lg: 0 8px 40px rgba(11,29,58,0.14);
  --shadow-xl: 0 16px 60px rgba(11,29,58,0.18);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;
  --max-width: 1240px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--gray-600);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: 1rem; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-sans); color: var(--primary); line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.7rem); }
h4 { font-size: 1.25rem; }
p { margin-bottom: 1rem; }
.text-accent { color: var(--secondary); }
.text-gold { color: var(--accent); }
.text-white { color: var(--white); }
.text-center { text-align: center; }
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--secondary);
  margin-bottom: 0.75rem;
}
.section-title { margin-bottom: 1rem; }
.section-subtitle { font-size: 1.15rem; color: var(--gray-400); max-width: 640px; margin: 0 auto 2.5rem; }

/* --- Layout --- */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--gray-50); }
.section-dark { background: var(--primary); color: var(--white); }
.section-dark h2, .section-dark h3, .section-dark h4 { color: var(--white); }
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  transition: var(--transition);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient-accent);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(0,168,120,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,168,120,0.4);
  color: var(--white);
}
.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
  color: var(--white);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--gray-200);
}
.btn-outline:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
}
.btn-gold {
  background: var(--accent);
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(232,168,56,0.3);
}
.btn-gold:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  color: var(--primary);
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.header.scrolled {
  background: rgba(11,29,58,0.97);
  backdrop-filter: blur(16px);
  padding: 10px 0;
  box-shadow: var(--shadow-lg);
}
.header .container { display: flex; align-items: center; justify-content: space-between; }
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.5px;
}
.logo:hover { color: var(--white); }
.logo-icon {
  width: 42px; height: 42px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.2rem; color: var(--white);
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: rgba(255,255,255,0.85);
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.1);
}
.nav-cta {
  background: var(--secondary) !important;
  color: var(--white) !important;
  padding: 10px 24px !important;
  border-radius: 50px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--secondary-light) !important; }

/* Mobile Menu */
.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; z-index: 1001; }
.menu-toggle span { width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding-top: 80px;
}
.hero h1 { color: var(--white); margin-bottom: 1.25rem; }
.hero h1 span { color: var(--secondary-light); }
.hero p { color: rgba(255,255,255,0.85); font-size: 1.2rem; margin-bottom: 2rem; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.hero-stat h3 { color: var(--secondary-light); font-size: 2.4rem; font-weight: 800; margin-bottom: 4px; }
.hero-stat p { color: rgba(255,255,255,0.7); font-size: 0.9rem; margin: 0; }

/* Page Hero (inner pages) */
.page-hero {
  position: relative;
  padding: 160px 0 80px;
  background: var(--gradient-primary);
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,168,120,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.page-hero h1 { color: var(--white); margin-bottom: 1rem; }
.page-hero p { color: rgba(255,255,255,0.8); font-size: 1.15rem; max-width: 600px; }
.breadcrumb { display: flex; gap: 8px; align-items: center; margin-bottom: 1.5rem; font-size: 0.9rem; }
.breadcrumb a { color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb span { color: rgba(255,255,255,0.4); }
.breadcrumb .current { color: var(--secondary-light); }

/* --- Cards --- */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, rgba(0,168,120,0.1) 0%, rgba(232,168,56,0.1) 100%);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.card h3 { margin-bottom: 12px; font-size: 1.2rem; }
.card p { color: var(--gray-400); font-size: 0.95rem; margin-bottom: 16px; }
.card-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.card-link:hover { gap: 10px; }

/* Program Card */
.program-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.program-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.program-card-img {
  height: 200px;
  background-size: cover;
  background-position: center;
  position: relative;
}
.program-card-img .badge {
  position: absolute;
  top: 16px; left: 16px;
  background: var(--secondary);
  color: var(--white);
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.program-card-body { padding: 24px; }
.program-card-body h3 { margin-bottom: 8px; font-size: 1.15rem; }
.program-card-body p { font-size: 0.9rem; color: var(--gray-400); margin-bottom: 16px; }
.program-card-meta { display: flex; gap: 16px; font-size: 0.8rem; color: var(--gray-300); }

/* --- Testimonial --- */
.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  position: relative;
}
.testimonial-card::before {
  content: '\201C';
  font-size: 4rem;
  color: var(--secondary);
  opacity: 0.2;
  position: absolute;
  top: 10px; left: 24px;
  font-family: var(--font-serif);
  line-height: 1;
}
.testimonial-card p { font-style: italic; color: var(--gray-500); margin-bottom: 20px; padding-top: 24px; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-weight: 700; font-size: 1rem;
}
.testimonial-info h4 { font-size: 0.95rem; margin-bottom: 2px; }
.testimonial-info span { font-size: 0.8rem; color: var(--gray-300); }

/* --- Stats Row --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 60px 0;
}
.stat-item { text-align: center; }
.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 0.9rem; color: var(--gray-400); }

/* --- Footer --- */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand p { font-size: 0.9rem; margin-top: 16px; line-height: 1.8; }
.footer h4 { color: var(--white); font-size: 1rem; margin-bottom: 20px; }
.footer-links a {
  display: block;
  color: rgba(255,255,255,0.6);
  padding: 4px 0;
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--secondary-light); padding-left: 4px; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}
.footer-social { display: flex; gap: 16px; }
.footer-social a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
  font-size: 0.9rem;
}
.footer-social a:hover { background: var(--secondary); border-color: var(--secondary); color: var(--white); }

/* --- Forms --- */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition);
  background: var(--white);
}
.form-control:focus { outline: none; border-color: var(--secondary); box-shadow: 0 0 0 4px rgba(0,168,120,0.1); }
textarea.form-control { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* --- Step Form --- */
.step-indicator { display: flex; justify-content: center; gap: 0; margin-bottom: 40px; }
.step {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-300);
  position: relative;
}
.step.active { color: var(--secondary); }
.step.completed { color: var(--primary); }
.step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid var(--gray-200);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
}
.step.active .step-num { border-color: var(--secondary); background: var(--secondary); color: var(--white); }
.step.completed .step-num { border-color: var(--primary); background: var(--primary); color: var(--white); }
.step-form-panel { display: none; }
.step-form-panel.active { display: block; animation: fadeIn 0.4s ease; }

/* --- WhatsApp Button --- */
.whatsapp-float {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 60px; height: 60px;
  background: #25D366;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 1.6rem;
  box-shadow: 0 4px 20px rgba(37,211,102,0.4);
  z-index: 999;
  transition: var(--transition);
}
.whatsapp-float:hover { transform: scale(1.1); color: white; box-shadow: 0 6px 30px rgba(37,211,102,0.5); }

/* --- News Card --- */
.news-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-card-img { height: 200px; background-size: cover; background-position: center; }
.news-card-body { padding: 24px; }
.news-card-date { font-size: 0.8rem; color: var(--secondary); font-weight: 600; margin-bottom: 8px; }
.news-card-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
.news-card-body p { font-size: 0.9rem; color: var(--gray-400); }

/* --- Download Item --- */
.download-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px;
  background: var(--white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
  margin-bottom: 12px;
}
.download-item:hover { border-color: var(--secondary); box-shadow: var(--shadow-sm); }
.download-info { display: flex; align-items: center; gap: 16px; }
.download-icon {
  width: 44px; height: 44px;
  background: rgba(0,168,120,0.1);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--secondary);
  font-size: 1.2rem;
}
.download-info h4 { font-size: 0.95rem; margin-bottom: 2px; }
.download-info span { font-size: 0.8rem; color: var(--gray-300); }

/* --- Animations --- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideRight { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .menu-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 300px; height: 100vh;
    background: var(--primary);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 32px 32px;
    gap: 0;
    transition: var(--transition);
    box-shadow: var(--shadow-xl);
  }
  .nav-links.open { right: 0; }
  .nav-links a { width: 100%; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .hero-content { max-width: 100%; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { text-align: center; justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; gap: 32px; }
  .page-hero { padding: 130px 0 60px; }
  .step { padding: 8px 12px; font-size: 0.75rem; }
  .step-label { display: none; }
}

@media (max-width: 480px) {
  .stats-row { grid-template-columns: 1fr; }
  .step-indicator { flex-wrap: wrap; }
}