/* ============================================
   DESIGN TOKENS & VARIABLES
   ============================================ */

:root {
  /* Primary Colors - Bright Blue for target design */
  --color-primary: #0D6EFD;
  --color-primary-dark: #0252d4;
  --color-primary-light: #4d94ff;

  /* Accent */
  --color-accent: #d4af37;
  --color-accent-dark: #b8920f;

  /* Backgrounds - Very Dark Navy/Black */
  --color-bg-primary: #050911;
  --color-bg-secondary: #0e1525;
  --color-bg-tertiary: #1a2332;

  /* Text */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8b3cf;
  --color-text-tertiary: #6b7280;

  /* Borders */
  --color-border: #1a2332;
  --color-border-light: #2d3748;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-display: "Space Grotesk", "Inter", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.1em;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-display);
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-dark);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

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

.btn-light:hover {
  background-color: transparent;
  color: white;
  border-color: white;
  transform: translateY(-2px);
}

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

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(5, 9, 17, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav-link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after {
  width: 100%;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-wrapper {
    gap: var(--space-md);
  }
}

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

.hero {
  padding: var(--space-4xl) 0;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.05) 0%, rgba(212, 175, 55, 0.02) 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-3xl);
}

.hero-title {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  color: var(--color-text-secondary);
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  animation: fadeIn 0.8s ease-out;
}

@media (max-width: 768px) {
  .hero {
    padding: var(--space-3xl) 0;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }
}

/* ============================================
   PARTNERSHIP SECTION
   ============================================ */

.partnership {
  padding: var(--space-4xl) 0;
  background-color: var(--color-bg-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-accent);
  margin-bottom: var(--space-2xl);
}

.partnership-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.partner-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  /* Added base styles for partner logos */
  transition: transform var(--transition-base);
}

/* Added styles to make RBS logo larger and more prominent */
.partner-logo.partner-primary {
  transform: scale(1.15);
  order: -1;
}

.partner-logo.partner-primary svg {
  width: 80px;
  height: 80px;
}

.partner-logo span {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  /* Emphasized RBS institution name */
  font-weight: 600;
}

.partner-logo.partner-primary span {
  color: var(--color-text-primary);
  font-weight: 700;
}

.partner-divider {
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
}

/* ============================================
   SECTIONS - GENERAL
   ============================================ */

section {
  padding: var(--space-4xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-text-primary);
}

.section-subtitle {
  text-align: center;
  margin-bottom: var(--space-3xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   ABOUT PROGRAM SECTION
   ============================================ */

.about-program {
  background-color: var(--color-bg-primary);
}

.about-program .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-content {
  order: 2;
}

.about-image {
  order: 1;
}

.about-text {
  margin-bottom: var(--space-lg);
}

.about-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
  .about-program .container {
    grid-template-columns: 1fr;
  }

  .about-content,
  .about-image {
    order: initial;
  }
}

/* ============================================
   CURRICULUM SECTION
   ============================================ */

.curriculum {
  background-color: var(--color-bg-secondary);
  text-align: center;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.curriculum-card {
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  text-align: center;
}

.curriculum-card:hover {
  transform: translateY(-4px);
  border-color: rgba(13, 110, 253, 0.5);
  background: rgba(13, 110, 253, 0.05);
  box-shadow: 0 4px 20px rgba(13, 110, 253, 0.2);
}

.curriculum-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  background: transparent;
  border-radius: var(--radius-lg);
}

.curriculum-card h3 {
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.curriculum-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* ============================================
   COMMUNITY / GALLERY SECTION
   ============================================ */

.community {
  background-color: var(--color-bg-primary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.gallery-item {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  aspect-ratio: 1;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

.gallery-item:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta-section {
  background: var(--color-primary);
  padding: var(--space-4xl) 0;
  text-align: center;
  color: white;
}

.cta-section h2 {
  color: white;
  margin-bottom: var(--space-lg);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

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

.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-section p,
.footer-link {
  display: block;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* ============================================
   INTERSECTION OBSERVER - SCROLL ANIMATIONS
   ============================================ */

.fade-in-scroll {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeIn 0.6s ease-out forwards;
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
  pointer-events: none;
  max-width: 400px;
  z-index: 1000;
  font-weight: 500;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (max-width: 768px) {
  .toast {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
  }
}

/* ============================================
   UTILITIES
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
}

@media (max-width: 640px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.5rem;
    --font-size-3xl: 1.25rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 3rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .curriculum-grid {
    grid-template-columns: 1fr;
  }
}