/* ============================================
   DESIGN SYSTEM — UNM BAHAGIA
   Prof. Dr. Eko Hadi Sujiono, M.Si.
   Academic Leadership Platform
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Primary Colors */
  --color-primary: #12186E;
  --color-primary-rgb: 18, 24, 110;
  --color-primary-dark: #0D1255;
  --color-primary-light: #1E2580;
  --color-accent: #FFEA08;
  --color-accent-rgb: 255, 234, 8;  
  --color-accent-dark: #e68a00;
  --color-accent-light: #ffc74d;

  /* Neutral & Base Colors */
  --color-bg: #FFFFFF;
  --color-bg-rgb: 255, 255, 255;
  --color-bg-soft: #F7F8FC;
  --color-bg-soft-rgb: 247, 248, 252;
  --color-bg-alt: #EEF0F8;
  --color-text: #111827;
  --color-text-rgb: 17, 24, 39;
  --color-text-secondary: #4B5563;
  --color-text-secondary-rgb: 75, 85, 99;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  /* White & Black Tokens */
  --color-white: #FFFFFF;
  --color-white-rgb: 255, 255, 255;
  --color-black: #000000;
  --color-black-rgb: 0, 0, 0;

  /* Status Colors */
  --color-success: #059669;
  --color-info: #3B82F6;

  /* Typography */
  --font-heading: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes (Desktop) */
  --text-xs: 0.8125rem;    /* 13px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1.0625rem;  /* 17px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.5rem;      /* 40px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 4rem;        /* 64px */

  /* Font Weights */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Line Heights */
  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-normal: 1.6;
  --lh-relaxed: 1.75;

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 900px;
  --max-width-wide: 1400px;
  --nav-height: 72px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(var(--color-primary-rgb), 0.06);
  --shadow-md: 0 4px 12px rgba(var(--color-primary-rgb), 0.08);
  --shadow-lg: 0 8px 30px rgba(var(--color-primary-rgb), 0.1);
  --shadow-xl: 0 16px 50px rgba(var(--color-primary-rgb), 0.12);
  --shadow-card: 0 2px 8px rgba(var(--color-primary-rgb), 0.06), 0 8px 24px rgba(var(--color-primary-rgb), 0.04);
  --shadow-card-hover: 0 8px 30px rgba(var(--color-primary-rgb), 0.12), 0 16px 40px rgba(var(--color-primary-rgb), 0.06);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-smooth: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   2. CSS RESET & BASE
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-5xl);
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.015em;
}

h3 {
  font-size: var(--text-3xl);
  letter-spacing: -0.01em;
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

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

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

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

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

/* Section Label / Eyebrow */
.section-label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--fw-bold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-label--white {
  color: rgba(var(--color-white-rgb), 0.8);
}

.section-label--white::before {
  background: rgba(var(--color-white-rgb), 0.4);
}

/* Section Title */
.section-title {
  margin-bottom: var(--space-4);
}

.section-title--white {
  color: var(--color-white);
}

/* Section Subtitle */
.section-subtitle {
  font-size: var(--text-lg);
  line-height: var(--lh-relaxed);
  color: var(--color-text-secondary);
  max-width: 700px;
}

.section-subtitle--white {
  color: rgba(var(--color-white-rgb), 0.8);
}

/* Accent Underline */
.accent-underline {
  position: relative;
  display: inline-block;
}

.accent-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* ============================================
   4. LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

.section {
  padding: var(--space-24) 0;
}

.section--sm {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-32) 0;
}

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

.section--soft {
  background-color: var(--color-bg-soft);
}

.section--alt {
  background-color: var(--color-bg-alt);
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }

/* Grid Utilities */
.grid {
  display: grid;
  gap: var(--space-8);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-8); }
.grid-5 { grid-template-columns: repeat(5, 1fr); gap: var(--space-8); }

/* Text Alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Font Weight Utilities */
.font-light { font-weight: var(--fw-light) !important; }
.font-normal, .font-regular { font-weight: var(--fw-regular) !important; }
.font-medium { font-weight: var(--fw-medium) !important; }
.font-semibold { font-weight: var(--fw-semibold) !important; }
.font-bold { font-weight: var(--fw-bold) !important; }
.font-extrabold { font-weight: var(--fw-extrabold) !important; }

/* Font Size Utilities */
.text-xs { font-size: var(--text-xs) !important; }
.text-sm { font-size: var(--text-sm) !important; }
.text-base { font-size: var(--text-base) !important; }
.text-lg { font-size: var(--text-lg) !important; }
.text-xl { font-size: var(--text-xl) !important; }

/* Margin Utilities */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: 2.5rem !important; }
.mt-12 { margin-top: var(--space-12); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: 2.5rem !important; }
.mx-auto { margin-left: auto; margin-right: auto; }
.me-1 { margin-inline-end: 0.25rem !important; }
.me-2 { margin-inline-end: 0.5rem !important; }
.ms-1 { margin-inline-start: 0.25rem !important; }
.ms-2 { margin-inline-start: 0.5rem !important; }
.ml-1 { margin-left: 0.25rem !important; }
.ml-2 { margin-left: 0.5rem !important; }
.mr-1 { margin-right: 0.25rem !important; }
.mr-2 { margin-right: 0.5rem !important; }

/* ============================================
   5. BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

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

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

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

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

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  font-weight: var(--fw-semibold);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(18, 24, 110, 0.2);
}

.btn--outline:active {
  transform: translateY(-1px);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-primary);
  border: 2px solid var(--color-accent);
  font-weight: var(--fw-bold);
}

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

/* Hero Academic CTA Button (Latar Kuning, Hover Latar Biru Border Kuning) */
.btn-hero-academic {
  background-color: var(--color-accent, #FFEA08) !important;
  color: var(--color-primary, #12186E) !important;
  font-weight: 700 !important;
  border: 2px solid var(--color-accent, #FFEA08) !important;
  transition: all 0.3s ease !important;
}

.btn-hero-academic:hover {
  background-color: var(--color-primary, #12186E) !important;
  color: var(--color-accent, #FFEA08) !important;
  border: 2px solid var(--color-accent, #FFEA08) !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 25px rgba(18, 24, 110, 0.3) !important;
}

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

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

.btn--outline-white {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid rgba(var(--color-white-rgb), 0.5);
}

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

.btn--sm {
  padding: 8px 20px;
  font-size: var(--text-sm);
}

.btn--md {
  padding: 12px 28px;
  font-size: var(--text-base);
}

.btn--lg {
  padding: 16px 38px;
  font-size: var(--text-lg);
}

.btn--icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* Arrow icon for buttons */
.btn-arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ============================================
   6. SCROLL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.active {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.active {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-scale.active {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delay for children */
.stagger > *:nth-child(1) { transition-delay: 0.05s; }
.stagger > *:nth-child(2) { transition-delay: 0.1s; }
.stagger > *:nth-child(3) { transition-delay: 0.15s; }
.stagger > *:nth-child(4) { transition-delay: 0.2s; }
.stagger > *:nth-child(5) { transition-delay: 0.25s; }
.stagger > *:nth-child(6) { transition-delay: 0.3s; }
.stagger > *:nth-child(7) { transition-delay: 0.35s; }

/* ============================================
   7. MISCELLANEOUS
   ============================================ */

/* Decorative separator line */
.separator {
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: var(--space-6) 0;
}

.separator--center {
  margin-left: auto;
  margin-right: auto;
}

.separator--white {
  background: rgba(var(--color-white-rgb), 0.3);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--fw-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background: rgba(var(--color-accent-rgb), 0.15);
  color: var(--color-primary);
}

.badge--accent {
  background: var(--color-primary);
  color: var(--color-accent);
  border: 1px solid rgba(var(--color-primary-rgb), 0.2);
}

.badge--white {
  background: rgba(var(--color-white-rgb), 0.15);
  color: var(--color-white);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-border);
  border: none;
  margin: var(--space-8) 0;
}

/* Visually Hidden (for accessibility) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-3) var(--space-6);
  background: var(--color-accent);
  color: var(--color-primary);
  font-weight: var(--fw-bold);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   8. SPACING UTILITY CLASSES (Padding & Margin)
   ============================================ */
/* Padding All Sides */
.p-0 { padding: 0 !important; }
.p-1 { padding: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 0.75rem !important; }
.p-4 { padding: 1rem !important; }
.p-5 { padding: 1.25rem !important; }
.p-6 { padding: 1.5rem !important; }
.p-8 { padding: 2rem !important; }
.p-10 { padding: 2.5rem !important; }
.p-12 { padding: 3rem !important; }

/* Padding Vertical (Top & Bottom) */
.py-0 { padding-top: 0 !important; padding-bottom: 0 !important; }
.py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.py-2 { padding-top: 0.5rem !important; padding-bottom: 0.5rem !important; }
.py-3 { padding-top: 0.75rem !important; padding-bottom: 0.75rem !important; }
.py-4 { padding-top: 1rem !important; padding-bottom: 1rem !important; }
.py-6 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }
.py-8 { padding-top: 2rem !important; padding-bottom: 2rem !important; }
.py-10 { padding-top: 2.5rem !important; padding-bottom: 2.5rem !important; }
.py-12 { padding-top: 3rem !important; padding-bottom: 3rem !important; }
.py-16 { padding-top: 4rem !important; padding-bottom: 4rem !important; }
.py-20 { padding-top: 5rem !important; padding-bottom: 5rem !important; }

/* Padding Horizontal (Left & Right) */
.px-0 { padding-left: 0 !important; padding-right: 0 !important; }
.px-2 { padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
.px-4 { padding-left: 1rem !important; padding-right: 1rem !important; }
.px-6 { padding-left: 1.5rem !important; padding-right: 1.5rem !important; }
.px-8 { padding-left: 2rem !important; padding-right: 2rem !important; }

/* Padding Top & Bottom Specific */
.pt-0 { padding-top: 0 !important; }
.pt-2 { padding-top: 0.5rem !important; }
.pt-4 { padding-top: 1rem !important; }
.pt-6 { padding-top: 1.5rem !important; }
.pt-8 { padding-top: 2rem !important; }
.pt-10 { padding-top: 2.5rem !important; }
.pt-12 { padding-top: 3rem !important; }
.pt-16 { padding-top: 4rem !important; }

.pb-0 { padding-bottom: 0 !important; }
.pb-2 { padding-bottom: 0.5rem !important; }
.pb-4 { padding-bottom: 1rem !important; }
.pb-6 { padding-bottom: 1.5rem !important; }
.pb-8 { padding-bottom: 2rem !important; }
.pb-10 { padding-bottom: 2.5rem !important; }
.pb-12 { padding-bottom: 3rem !important; }
.pb-16 { padding-bottom: 4rem !important; }

/* Margin Bottom Utilities */
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 0.75rem !important; }
.mb-4 { margin-bottom: 1rem !important; }
.mb-5 { margin-bottom: 1.25rem !important; }
.mb-6 { margin-bottom: 1.5rem !important; }
.mb-8 { margin-bottom: 2rem !important; }
.mb-10 { margin-bottom: 2.5rem !important; }
.mb-12 { margin-bottom: 3rem !important; }
.mb-16 { margin-bottom: 4rem !important; }