/* ============================================
   SIAKAD STIKES BBM - Professional CSS
   SEO Friendly | Responsive Design
   ============================================ */

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

:root {
  --primary: #0d5f8f;
  --primary-light: #1e7ab5;
  --primary-dark: #083d5c;
  --secondary: #2ecc71;
  --accent: #e74c3c;
  --neutral-dark: #2c3e50;
  --neutral-gray: #7f8c8d;
  --neutral-light: #ecf0f1;
  --white: #ffffff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--neutral-dark);
  background-color: var(--white);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: var(--white);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.25rem;
}

nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

nav a:hover {
  color: var(--secondary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  padding: 6rem 1.5rem;
  text-align: center;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero-text p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

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

.btn-primary:hover {
  background: #27ae60;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.btn-secondary:hover {
  background: var(--white);
  color: var(--primary);
  transform: translateY(-2px);
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* ============================================
   FEATURES SECTION
   ============================================ */

.section {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 3rem;
  text-align: center;
  color: var(--primary);
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--secondary);
  border-radius: 2px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--white);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  text-align: center;
  transition: all 0.3s ease;
  border-top: 4px solid var(--primary);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--secondary);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.feature-card h3 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--neutral-gray);
  line-height: 1.8;
}

/* ============================================
   AKADEMIK SECTION
   ============================================ */

.akademik-section {
  background: linear-gradient(135deg, var(--neutral-light) 0%, var(--white) 100%);
}

.akademik-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.akademik-card {
  background: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.akademik-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.akademik-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  padding: 1.5rem;
  text-align: center;
}

.akademik-header h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.akademik-body {
  padding: 2rem 1.5rem;
}

.akademik-body p {
  color: var(--neutral-gray);
  margin-bottom: 1rem;
}

.akademik-body ul {
  list-style: none;
  padding: 0;
}

.akademik-body li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--neutral-gray);
}

.akademik-body li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--secondary);
  font-weight: bold;
}

/* ============================================
   TENTANG SECTION
   ============================================ */

.tentang-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.tentang-text h2 {
  color: var(--primary);
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.tentang-text p {
  color: var(--neutral-gray);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.tentang-img {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 8px;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.tentang-img svg {
  width: 100%;
  max-width: 300px;
}

/* ============================================
   FAQ SECTION
   ============================================ */

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 1.5rem;
  border: 1px solid var(--neutral-light);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  background: var(--primary);
  color: var(--white);
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  transition: background 0.3s ease;
}

.faq-question:hover {
  background: var(--primary-light);
}

.faq-toggle {
  font-size: 1.25rem;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  background: var(--white);
  padding: 1.5rem;
  color: var(--neutral-gray);
  line-height: 1.8;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-text h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.contact-text p {
  color: var(--neutral-gray);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

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

.form-group label {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--neutral-light);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 95, 143, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group button {
  align-self: flex-start;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background: var(--neutral-dark);
  color: var(--white);
  padding: 3rem 1.5rem 1rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-section h4 {
  margin-bottom: 1rem;
  color: var(--secondary);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.75rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: 1rem;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-dark);
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
  }

  nav.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero-content {
    grid-template-columns: 1fr;
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

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

  .tentang-content {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.5rem;
  }

  .section {
    padding: 2rem 1rem;
  }

  .features-grid,
  .akademik-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-center {
  text-align: center;
}

.text-primary {
  color: var(--primary);
}

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

/* ============================================
   LOADING & ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  header, footer, nav {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }
}