/**
 * ============================================
 * Steven Van Overmeiren - Portfolio
 * Main Stylesheet
 * ============================================
 *
 * Table of Contents:
 *   1. Reset & Base Styles
 *   2. Design Tokens (CSS Custom Properties)
 *   3. Typography
 *   4. Keyframe Animations
 *   5. Scroll Reveal Animations
 *   6. Navbar & Navigation
 *   7. Layout (Main, Container)
 *   8. Hero Section
 *   9. About Section
 *  10. Buttons
 *  11. Projects Grid (Card Listing)
 *  12. Project Detail Pages
 *  13. Image Carousel
 *  14. Detail Sections & Highlight Cards
 *  15. Sub-Project Cards
 *  16. PDF Viewer Grid
 *  17. Contact Section
 *  18. Resume Section
 *  19. Footer
 *  20. Image Modal (Lightbox)
 *  21. Responsive Breakpoints
 */


/* ----------------------------------------
 * 1. RESET & BASE STYLES
 * Universal box-sizing and margin/padding
 * reset for consistent cross-browser layout.
 * ---------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}


/* ----------------------------------------
 * 2. DESIGN TOKENS (CSS Custom Properties)
 * Centralized color palette, shadows,
 * border radii, transitions, and layout
 * variables. ASU maroon & gold branding.
 * ---------------------------------------- */
:root {
  /* Brand colors (ASU) */
  --maroon: #8C1D40;
  --maroon-dark: #6B1630;
  --maroon-light: #b02a55;
  --gold: #FFC627;
  --gold-dark: #e6b223;

  /* Neutrals */
  --white: #ffffff;
  --off-white: #fafafa;
  --gray-50: #f7f8fa;
  --gray-100: #f0f2f5;
  --gray-200: #e4e7ec;
  --gray-300: #d0d5dd;
  --gray-400: #98a2b3;
  --gray-500: #667085;
  --gray-600: #475467;
  --gray-700: #344054;
  --gray-800: #1d2939;
  --gray-900: #101828;

  /* Elevation shadows */
  --shadow-xs: 0 1px 2px rgba(16,24,40,0.05);
  --shadow-sm: 0 1px 3px rgba(16,24,40,0.06), 0 1px 2px rgba(16,24,40,0.04);
  --shadow-md: 0 4px 8px -2px rgba(16,24,40,0.06), 0 2px 4px -2px rgba(16,24,40,0.04);
  --shadow-lg: 0 12px 16px -4px rgba(16,24,40,0.08), 0 4px 6px -2px rgba(16,24,40,0.03);
  --shadow-xl: 0 20px 24px -4px rgba(16,24,40,0.08), 0 8px 8px -4px rgba(16,24,40,0.03);
  --shadow-2xl: 0 24px 48px -12px rgba(16,24,40,0.15);

  /* Border radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s ease;
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-smooth: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
}


/* ----------------------------------------
 * 3. TYPOGRAPHY & BASE ELEMENTS
 * Font stack, smooth scrolling, default
 * styles for links and headings.
 * ---------------------------------------- */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-700);
  background: var(--gray-50);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

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

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

h1, h2, h3, h4 {
  color: var(--gray-900);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}


/* ----------------------------------------
 * 4. KEYFRAME ANIMATIONS
 * Reusable animations for fade-in, slide-up,
 * floating decorative elements, gradient
 * shifting, and pulsing effects.
 * ---------------------------------------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}


/* ----------------------------------------
 * 5. SCROLL REVEAL ANIMATIONS
 * Applied via JavaScript IntersectionObserver.
 * - .reveal: single element fade-in
 * - .reveal-stagger: children animate
 *   sequentially with staggered delays
 * ---------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger children: each child fades in with increasing delay */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.32s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.4s; }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 0.48s; }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 0.56s; }
.reveal-stagger.visible > *:nth-child(9) { transition-delay: 0.64s; }
.reveal-stagger.visible > *:nth-child(10) { transition-delay: 0.72s; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}


/* ----------------------------------------
 * 6. NAVBAR & NAVIGATION
 * Fixed glassmorphism navbar with maroon
 * background, brand name, dropdown menu
 * for projects, and mobile hamburger toggle.
 * ---------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(140, 29, 64, 0.95);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 1000;
  transition: all 0.4s ease;
}

/* Enhanced shadow on scroll (toggled via JS) */
.navbar.scrolled {
  background: rgba(140, 29, 64, 0.98);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 8px 24px rgba(140, 29, 64, 0.15);
}

/* Brand name and subtitle */
.nav-brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-brand a {
  color: var(--white);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  transition: all var(--transition);
}

.nav-brand a:hover { color: var(--gold); }

.nav-brand .nav-subtitle {
  color: rgba(255,198,39,0.9);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* Nav links row */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.12);
}

/* Gold underline indicator on active link */
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
}

/* Hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  position: relative;
  width: 36px;
  height: 36px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
  position: absolute;
  left: 8px;
  transition: all var(--transition);
  border-radius: 2px;
}

.nav-toggle span:nth-child(1) { top: 10px; }
.nav-toggle span:nth-child(2) { top: 17px; }
.nav-toggle span:nth-child(3) { top: 24px; }

/* Animated X when menu is open */
.nav-toggle.active span:nth-child(1) { top: 17px; transform: rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { top: 17px; transform: rotate(-45deg); }

/* Projects dropdown menu */
.nav-dropdown { position: relative; }

.nav-dropdown .dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2xl);
  min-width: 280px;
  padding: 0.4rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid var(--gray-100);
}

/* Decorative arrow on dropdown */
.nav-dropdown .dropdown-menu::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px;
  height: 12px;
  background: var(--white);
  border-top: 1px solid var(--gray-100);
  border-left: 1px solid var(--gray-100);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: 0.5rem 0.85rem;
  color: var(--gray-600);
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-weight: 500;
  background: none;
}

.dropdown-menu a:hover {
  background: var(--gray-50);
  color: var(--maroon);
  padding-left: 1.1rem;
}


/* ----------------------------------------
 * 7. LAYOUT (Main Content & Container)
 * Flex layout pushes footer to bottom.
 * Container centers content with max-width.
 * ---------------------------------------- */
main {
  flex: 1;
  margin-top: var(--nav-height);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}


/* ----------------------------------------
 * 8. HERO SECTION (Home Page)
 * Two-column grid with text/buttons on the
 * left and profile image on the right.
 * Includes animated gradient orb decorations.
 * ---------------------------------------- */
.hero {
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 100%);
}

/* Decorative floating gradient orbs */
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -150px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(140,29,64,0.06) 0%, transparent 65%);
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -200px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,198,39,0.06) 0%, transparent 65%);
  animation: float 10s ease-in-out infinite reverse;
  pointer-events: none;
}

/* Two-column grid: text (wider) | image */
.hero-content {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* Hero text styles */
.hero-text h1 {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 0.75rem;
  line-height: 1.05;
  color: var(--gray-900);
}

/* Animated gradient text effect for name */
.hero-text h1 .gradient-text {
  background: linear-gradient(135deg, var(--maroon) 0%, var(--maroon-light) 50%, var(--gold-dark) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease infinite;
}

.hero-text .university {
  font-size: 0.95rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-bottom: 0.35rem;
}

.hero-text .degree {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--maroon);
  font-weight: 700;
  margin-bottom: 1.75rem;
  padding: 0.3rem 0.9rem;
  background: rgba(140,29,64,0.06);
  border-radius: 50px;
  letter-spacing: 0.02em;
}

.hero-text .summary {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.hero-socials {
  display: flex;
  gap: 0.6rem;
}

/* Profile image */
.hero-image {
  display: flex;
  justify-content: center;
  position: relative;
}

.hero-image img {
  width: 340px;
  height: 440px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-image:hover img {
  transform: scale(1.02);
}


/* ----------------------------------------
 * 9. ABOUT SECTION
 * Centered card with gradient accent line
 * on top, used on the home page.
 * ---------------------------------------- */
.about-section {
  padding: 5rem 0;
  position: relative;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--gray-100) 50%, var(--gray-50) 100%);
}

/* Top accent line */
.about-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--maroon), var(--gold));
  border-radius: 2px;
}

.about-card {
  max-width: 780px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 3rem 3.5rem;
  position: relative;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-md);
}

/* Gradient bar at top of card */
.about-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 2.5rem;
  right: 2.5rem;
  height: 3px;
  background: linear-gradient(90deg, var(--maroon), var(--gold));
  border-radius: 0 0 4px 4px;
}

.about-card h2 {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--gray-900);
}

.about-card h2 span {
  color: var(--maroon);
}

.about-card p {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.85;
  margin-bottom: 1.1rem;
}

.about-card p:last-child { margin-bottom: 0; }


/* ----------------------------------------
 * 10. BUTTONS
 * Reusable button styles with primary,
 * outline, small, and icon-only variants.
 * All buttons use pill-shaped border-radius.
 * ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
  position: relative;
  letter-spacing: 0.01em;
}

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

.btn-primary:hover {
  background: var(--maroon-dark);
  border-color: var(--maroon-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(140,29,64,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--maroon);
  border-color: var(--gray-300);
}

.btn-outline:hover {
  background: var(--maroon);
  color: var(--white);
  border-color: var(--maroon);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(140,29,64,0.3);
}

.btn-sm {
  padding: 0.45rem 1.1rem;
  font-size: 0.78rem;
}

/* Circular icon button (social links) */
.btn-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border: 1px solid var(--gray-200);
  color: var(--gray-500);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-spring);
}

.btn-icon:hover {
  border-color: var(--maroon);
  color: var(--maroon);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}


/* ----------------------------------------
 * 11. PROJECTS GRID (Card Listing)
 * Responsive card grid on the main
 * projects page. Each card has an image,
 * title, description, skill tags, and link.
 * ---------------------------------------- */

/* Page header (used on projects, contact, resume) */
.page-header {
  text-align: center;
  padding: 4rem 0 3rem;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.page-header p {
  font-size: 1rem;
  color: var(--gray-500);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Card grid layout */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.25rem;
  padding-bottom: 5rem;
}

/* Background wrapper for projects page */
.projects-page-bg {
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 8%, var(--gray-50) 92%, var(--gray-100) 100%);
  position: relative;
}

/* Individual project card */
.project-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(140,29,64,0.2);
}

.project-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card:hover .project-card-image {
  transform: scale(1.03);
}

.project-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--white);
}

.project-card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--gray-900);
}

.project-card-body p {
  font-size: 0.85rem;
  color: var(--gray-500);
  line-height: 1.55;
  margin-bottom: 0.9rem;
  flex: 1;
}

/* Skill tags on project cards */
.project-card-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.skill-tag {
  padding: 0.2rem 0.6rem;
  background: rgba(140,29,64,0.06);
  color: var(--maroon);
  border-radius: 50px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: all var(--transition-fast);
  border: 1px solid rgba(140,29,64,0.08);
}

.skill-tag:hover {
  background: rgba(140,29,64,0.12);
  border-color: rgba(140,29,64,0.15);
}

/* "View Project" link with animated arrow */
.project-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--maroon);
  transition: all var(--transition);
}

.project-card:hover .project-card-link { gap: 0.6rem; }

.project-card-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition);
}

.project-card:hover .project-card-link svg {
  transform: translateX(3px);
}


/* ----------------------------------------
 * 12. PROJECT DETAIL PAGES
 * Layout for individual project pages
 * including back link, title with accent
 * bar, and subtitle.
 * ---------------------------------------- */
.project-detail {
  padding: 3rem 0 5rem;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 15%, var(--gray-50) 100%);
  min-height: 80vh;
  position: relative;
}

.project-detail .container {
  max-width: 1000px;
}

/* Back to Projects pill link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-400);
  margin-bottom: 2rem;
  transition: all var(--transition);
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
}

.back-link:hover {
  color: var(--maroon);
  background: rgba(140,29,64,0.04);
  border-color: rgba(140,29,64,0.15);
  gap: 0.55rem;
}

.back-link svg {
  width: 14px;
  height: 14px;
}

.project-detail h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

/* Maroon-to-gold gradient accent bar under title */
.project-detail h1::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--maroon), var(--gold));
  border-radius: 2px;
  margin-top: 0.65rem;
}

.project-detail .subtitle,
.project-detail .project-subtitle {
  font-size: 1rem;
  color: var(--gray-500);
  margin-bottom: 2.5rem;
  line-height: 1.5;
}


/* ----------------------------------------
 * 13. IMAGE CAROUSEL
 * Auto-built from .gallery elements with
 * 2+ images. Includes navigation arrows,
 * dot indicators, counter badge, and
 * touch swipe support.
 * ---------------------------------------- */

/* Active carousel container */
.gallery.carousel-active {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  margin-bottom: 3rem;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.gallery.carousel-active .carousel-track {
  position: relative;
  width: 100%;
}

/* Hide all items except the active one */
.gallery.carousel-active .gallery-item {
  display: none;
  position: relative;
  border-radius: 0;
  box-shadow: none;
  animation: fadeIn 0.35s ease;
}

.gallery.carousel-active .gallery-item.active {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.gallery.carousel-active .gallery-item img {
  width: auto;
  max-width: 100%;
  height: 500px;
  object-fit: contain;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

/* Disable hover transforms inside carousel */
.gallery.carousel-active .gallery-item:hover {
  transform: none;
  box-shadow: none;
}

.gallery.carousel-active .gallery-item:hover img {
  transform: none;
}

/* Caption below image in carousel mode */
.gallery.carousel-active .gallery-caption {
  position: relative;
  bottom: auto;
  left: auto;
  right: auto;
  background: none;
  opacity: 1;
  text-align: center;
  padding: 0.75rem 1.5rem 0;
  font-size: 0.88rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* Navigation arrows */
.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(calc(-50% - 20px));
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  border: none;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  z-index: 10;
  font-size: 1.1rem;
}

.carousel-arrow:hover {
  background: rgba(0,0,0,0.7);
  transform: translateY(calc(-50% - 20px)) scale(1.1);
}

.carousel-arrow.prev { left: 0.5rem; }
.carousel-arrow.next { right: 0.5rem; }

/* Dot indicators */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.4rem 0 0.5rem;
}

.carousel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gray-300);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}

/* Active dot expands into a pill shape */
.carousel-dot.active {
  background: var(--maroon);
  width: 22px;
  border-radius: 4px;
}

/* Image counter badge (e.g. "1 / 7") */
.carousel-counter {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: rgba(0,0,0,0.45);
  color: var(--white);
  padding: 0.2rem 0.55rem;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 700;
  z-index: 10;
}

/* Fallback grid for galleries with a single image */
.gallery:not(.carousel-active) {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.gallery:not(.carousel-active) .gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.gallery:not(.carousel-active) .gallery-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.gallery:not(.carousel-active) .gallery-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery:not(.carousel-active) .gallery-item:hover img {
  transform: scale(1.04);
}

/* Hover-reveal caption overlay */
.gallery:not(.carousel-active) .gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2.5rem 0.75rem 0.6rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery:not(.carousel-active) .gallery-item:hover .gallery-caption {
  opacity: 1;
}


/* ----------------------------------------
 * 14. DETAIL SECTIONS & HIGHLIGHT CARDS
 * White card containers for project content
 * (overview, process, tools, skills).
 * Highlight cards used for outcomes and
 * reflections with a maroon left border.
 * ---------------------------------------- */

/* Standard detail section card */
.detail-section {
  margin-bottom: 2.25rem;
  background: var(--white);
  padding: 1.75rem 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition);
}

.detail-section:hover {
  box-shadow: var(--shadow-sm);
}

.detail-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  padding-bottom: 0.55rem;
  color: var(--gray-900);
  position: relative;
  display: inline-block;
  border-bottom: none;
}

/* Gradient accent line under section heading */
.detail-section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: linear-gradient(90deg, var(--maroon), var(--gold));
  border-radius: 3px;
}

.detail-section p {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.8;
}

.detail-section ul, .detail-section ol {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
}

.detail-section li {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.65;
  margin-bottom: 0.35rem;
}

.detail-section li::marker {
  color: var(--maroon);
}

/* Two-column layout for process + tools */
.detail-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
}

.detail-columns .detail-section {
  margin-bottom: 0;
}

/* Skills list (flex wrap of skill tags) */
.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skills-list .skill-tag {
  padding: 0.3rem 0.8rem;
  font-size: 0.78rem;
}

/* Tools list (flex wrap of tool tags) */
.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tool-tag {
  padding: 0.3rem 0.8rem;
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
  color: var(--gray-600);
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-fast);
}

.tool-tag:hover {
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
  border-color: var(--gray-300);
  transform: translateY(-1px);
}

/* Highlight card (outcomes, reflections) */
.highlight-card {
  background: linear-gradient(135deg, rgba(140,29,64,0.04) 0%, rgba(255,198,39,0.04) 100%);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  border: 1px solid rgba(140,29,64,0.12);
  border-left: 4px solid var(--maroon);
  margin-bottom: 1.75rem;
  position: relative;
  box-shadow: var(--shadow-xs);
}

.highlight-card h2, .highlight-card h3 {
  font-size: 1.15rem;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0.6rem;
  display: block;
  color: var(--maroon);
}

/* Remove the accent line on highlight card headings */
.highlight-card h2::after, .highlight-card h3::after {
  display: none;
}

.highlight-card p {
  font-size: 0.93rem;
  color: var(--gray-600);
  line-height: 1.75;
}

.highlight-card ul, .highlight-card ol {
  padding-left: 1.25rem;
  margin: 0.5rem 0;
}

.highlight-card li {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.65;
  margin-bottom: 0.25rem;
}

.highlight-card li::marker {
  color: var(--maroon);
}


/* ----------------------------------------
 * 15. SUB-PROJECT CARDS
 * Two-column grid for sub-pages within a
 * parent project (e.g. solar car subsystems).
 * ---------------------------------------- */
.sub-projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.sub-project-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
}

.sub-project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(140,29,64,0.2);
}

.sub-project-card img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.sub-project-card:hover img {
  transform: scale(1.04);
}

.sub-project-card-body {
  padding: 1.15rem;
}

.sub-project-card-body h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.sub-project-card-body p {
  font-size: 0.82rem;
  color: var(--gray-500);
  margin-bottom: 0.65rem;
  line-height: 1.5;
}


/* ----------------------------------------
 * 16. PDF VIEWER GRID
 * Side-by-side embedded PDF iframes with
 * download buttons, used on project pages
 * with multiple reports (e.g. finite element,
 * wind energy).
 * ---------------------------------------- */
.pdf-viewer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}

.pdf-viewer-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pdf-viewer-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-800);
  margin: 0;
}

.pdf-embed {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  background: var(--gray-100);
}

.pdf-embed iframe {
  width: 100%;
  height: 500px;
  border: none;
  display: block;
}

.pdf-viewer-card .btn {
  align-self: flex-start;
}

.pdf-downloads {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}


/* ----------------------------------------
 * 17. CONTACT SECTION
 * Centered layout with contact link cards
 * (email, LinkedIn, etc.) and a gradient
 * accent line at the top.
 * ---------------------------------------- */
.contact-section {
  padding: 5rem 0;
  text-align: center;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 30%, var(--gray-50) 70%, var(--gray-100) 100%);
  position: relative;
}

.contact-section h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.contact-section .intro {
  font-size: 1rem;
  color: var(--gray-500);
  max-width: 480px;
  margin: 0 auto 2.5rem;
  line-height: 1.65;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-width: 400px;
  margin: 0 auto 2.5rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.25rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.contact-link:hover {
  border-color: var(--maroon);
  transform: translateX(6px);
  box-shadow: -4px 4px 20px rgba(140,29,64,0.08);
  color: var(--maroon);
}

.contact-link svg {
  width: 20px;
  height: 20px;
  color: var(--maroon);
  flex-shrink: 0;
}

.contact-link .contact-label {
  font-size: 0.65rem;
  color: var(--gray-400);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-link .contact-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-800);
}

.contact-footer {
  font-size: 0.9rem;
  color: var(--gray-400);
  font-style: italic;
}


/* ----------------------------------------
 * 18. RESUME SECTION
 * Full-width embedded PDF viewer with
 * download/view buttons above.
 * ---------------------------------------- */
.resume-section {
  padding: 3rem 0 5rem;
  text-align: center;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 20%, var(--gray-50) 100%);
}

.resume-section h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.resume-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.resume-embed {
  width: 100%;
  max-width: 850px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
}

.resume-embed iframe {
  width: 100%;
  height: 1000px;
  border: none;
}


/* ----------------------------------------
 * 19. FOOTER
 * Dark footer with gradient accent line
 * at the top. Stays at bottom via flexbox.
 * ---------------------------------------- */
.footer {
  background: var(--gray-900);
  color: var(--gray-500);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 500;
  margin-top: auto;
  letter-spacing: 0.02em;
  position: relative;
}

/* Top gradient accent line */
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--maroon), var(--gold), var(--maroon));
}

.footer a { color: var(--gold); }
.footer a:hover { color: var(--gold-dark); }


/* ----------------------------------------
 * 20. IMAGE MODAL (Lightbox)
 * Full-screen overlay for viewing gallery
 * images at full size. Triggered by clicking
 * a carousel image. Close via X, overlay
 * click, or Escape key.
 * ---------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.modal-overlay.active {
  display: flex;
  animation: fadeIn 0.15s ease;
}

.modal-content {
  max-width: 90vw;
  max-height: 85vh;
  position: relative;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 4px;
}

.modal-caption {
  text-align: center;
  color: rgba(255,255,255,0.6);
  margin-top: 0.75rem;
  font-size: 0.82rem;
  font-weight: 500;
}

.modal-close {
  position: absolute;
  top: -44px;
  right: 0;
  background: rgba(255,255,255,0.08);
  border: none;
  color: var(--white);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.modal-close:hover {
  background: rgba(255,255,255,0.2);
}


/* ----------------------------------------
 * 21. RESPONSIVE BREAKPOINTS
 * Adapts layout for tablets (900px),
 * mobile (768px), and small phones (480px).
 * ---------------------------------------- */

/* Tablet: stack hero to single column */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2.5rem;
  }

  .hero-text h1 { font-size: 2.5rem; }
  .hero-text .degree { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-socials { justify-content: center; }
  .hero-image { order: -1; }
  .hero-image img { width: 240px; height: 310px; }
  .detail-columns { grid-template-columns: 1fr; }

  .gallery.carousel-active .gallery-item img { height: 380px; }
}

/* Mobile: show hamburger menu, single-column grids */
@media (max-width: 768px) {
  :root { --nav-height: 56px; }

  .navbar { padding: 0 1.25rem; }
  .nav-brand a { font-size: 0.95rem; }
  .nav-brand .nav-subtitle { font-size: 0.55rem; }

  /* Full-width slide-down mobile menu */
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(140, 29, 64, 0.98);
    backdrop-filter: blur(24px);
    flex-direction: column;
    padding: 0.75rem;
    gap: 0.15rem;
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-2xl);
  }

  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-links a { width: 100%; text-align: center; padding: 0.65rem 1rem; }
  .nav-toggle { display: block; }

  /* Flatten dropdown into mobile menu */
  .nav-dropdown .dropdown-menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    background: rgba(255,255,255,0.05);
    min-width: auto;
    opacity: 1;
    visibility: visible;
    display: none;
    margin-top: 0.15rem;
  }

  .nav-dropdown .dropdown-menu::before { display: none; }

  .nav-dropdown:hover .dropdown-menu,
  .nav-dropdown .dropdown-menu.open {
    display: block;
  }

  .dropdown-menu a {
    color: rgba(255,255,255,0.7);
    text-align: center;
  }

  .dropdown-menu a:hover {
    background: rgba(255,255,255,0.08);
    color: var(--white);
    padding-left: 0.85rem;
  }

  /* Stack grids to single column */
  .projects-grid { grid-template-columns: 1fr; }
  .sub-projects-grid { grid-template-columns: 1fr; }
  .pdf-viewer-grid { grid-template-columns: 1fr; }
  .pdf-embed iframe { height: 400px; }
  .page-header h1 { font-size: 2rem; }
  .project-detail h1 { font-size: 1.65rem; }
  .container { padding: 0 1.25rem; }
  .about-card { padding: 2rem 1.5rem; }
  .detail-section { padding: 1.25rem 1.25rem; }
  .gallery.carousel-active { padding: 1rem; }

  .gallery:not(.carousel-active) { grid-template-columns: 1fr; }
  .gallery:not(.carousel-active) .gallery-item img { height: 200px; }
  .gallery.carousel-active .gallery-item img { height: 300px; }

  .carousel-arrow { width: 38px; height: 38px; font-size: 0.95rem; }
  .resume-embed iframe { height: 70vh; }
  .contact-section h1 { font-size: 2rem; }

  .hero { padding: 3.5rem 0 3rem; }
}

/* Small phones: further size reductions */
@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-text h1 { font-size: 2rem; }
  .gallery.carousel-active .gallery-item img { height: 240px; }
  .carousel-arrow { width: 34px; height: 34px; }
}