/* ========================================
   DESIGN SYSTEM & CSS VARIABLES
   ======================================== */

:root {
  /* Color Palette - Dark SaaS Theme (Default) */
  --color-primary: #06b6d4;      /* Cyan 500 */
  --color-primary-dark: #0891b2; /* Cyan 600 */
  --color-primary-light: #22d3ee; /* Cyan 400 */
  --color-secondary: #3b82f6;    /* Blue 500 */
  --color-accent: #f472b6;       /* Pink 400 */

  /* Semantic Colors */
  --color-background: #030712;   /* Gray 950 */
  --color-background-secondary: #111827; /* Gray 900 */
  --color-background-tertiary: #1f2937;  /* Gray 800 */
  
  --color-surface: rgba(17, 24, 39, 0.7); /* Translucent Gray 900 */
  --color-border: rgba(55, 65, 81, 0.5); /* Gray 700 opacity */
  
  --color-text: #f9fafb;         /* Gray 50 */
  --color-text-secondary: #d1d5db; /* Gray 300 */
  --color-text-muted: #d1d5db;   /* Was #9ca3af (Gray 400) - Lightened for better contrast */

  /* Gradients */
  --gradient-hero: radial-gradient(circle at 50% 0%, rgba(6, 182, 212, 0.15) 0%, rgba(3, 7, 18, 0) 70%);
  --gradient-card: linear-gradient(180deg, rgba(31, 41, 55, 0.4) 0%, rgba(17, 24, 39, 0.4) 100%);
  --gradient-text: linear-gradient(135deg, #22d3ee 0%, #3b82f6 100%);

  /* Spacing Scale (4px base grid) */
  --space-xs: 0.5rem;   /* 8px */
  --space-sm: 1rem;     /* 16px */
  --space-md: 1.5rem;   /* 24px */
  --space-lg: 2rem;     /* 32px */
  --space-xl: 3rem;     /* 48px */
  --space-2xl: 5rem;    /* 80px */
  --space-3xl: 6rem;    /* 96px */

  /* Typography Scale */
  --font-family-base: "Inter", system-ui, -apple-system, 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;
  --font-size-6xl: 4.5rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.2;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-neon: 0 0 15px rgba(6, 182, 212, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms ease;
  --transition-all: all var(--transition-base);
  
  /* Glassmorphism */
  --glass-bg: rgba(17, 24, 39, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(12px);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Light Mode Variables (Optional/Fallback) */
/* Light Mode Variables (Optional/Fallback) */
[data-theme="light"] {
  --color-primary: #0891b2;
  --color-background: #ffffff;
  --color-background-secondary: #f3f4f6;
  --color-background-tertiary: #e5e7eb;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --gradient-card: none;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  
  /* Light Mode Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.05);
  --shadow-neon: 0 4px 20px rgba(8, 145, 178, 0.15); /* Soft cyan shadow */
  --gradient-hero: radial-gradient(circle at 50% 0%, rgba(8, 145, 178, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  /* Account for fixed navbar */
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

/* Override Bootstrap Utilities */
.text-muted {
  color: var(--color-text-muted) !important;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================
   SKIP NAVIGATION (Accessibility)
   ======================================== */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: var(--z-tooltip);
  font-weight: var(--font-weight-semibold);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

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

/* ========================================
   NAVIGATION (Floating Glass)
   ======================================== */

.navbar {
  transition: var(--transition-all);
  padding: var(--space-sm) 0;
}

.navbar.bg-dark {
  background-color: transparent !important; /* Override bootstrap */
}

.navbar.fixed-top {
  top: 15px;
  right: var(--space-md);
  left: var(--space-md);
  width: auto;
  max-width: 1200px;
  margin: 0 auto;
  border-radius: var(--radius-full);
  background: var(--glass-bg); /* Use variable */
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); /* Use variable */
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1); /* Lighter shadow */
}

.navbar-brand {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  color: var(--color-text) !important;
  letter-spacing: -0.5px;
}

.navbar-nav .nav-link {
  color: var(--color-text-secondary) !important;
  font-weight: var(--font-weight-medium);
  padding: var(--space-xs) var(--space-md) !important;
  transition: var(--transition-base);
  border-radius: var(--radius-full);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--color-primary-dark) !important; /* Ensure visibility */
  background: rgba(125, 211, 252, 0.1); /* Subtle tint */
}



/* Remove the underline animation in favor of pill background */
.navbar-nav .nav-link::after {
  display: none;
}

/* Mobile Navbar Adjustments */
@media (max-width: 991px) {
  .navbar-collapse {
    background: var(--color-background-secondary);
    padding: var(--space-md);
    border-radius: var(--radius-xl);
    margin-top: var(--space-sm);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--glass-border);
  }
}



/* Dark Mode Toggle */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border); /* Use variable */
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-all);
  color: var(--color-text); /* Use variable */
  margin-left: var(--space-md);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  background: rgba(33, 150, 243, 0.1);
  transform: rotate(20deg);
}

/* ========================================
   FOCUS STATES (Accessibility)
   ======================================== */

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ========================================
   MODERN UI UTILITIES
   ======================================== */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.text-gradient {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.glow-text {
    text-shadow: var(--shadow-neon);
}

.hover-glow:hover {
    box-shadow: var(--shadow-neon);
    border-color: rgba(6, 182, 212, 0.5);
}

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

.hero-section {
  min-height: 40vh; /* Reduced from 100vh to minimize gap */
  position: relative;
  overflow: hidden;
  background: var(--color-background);
  color: var(--color-text);
  padding-top: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* Glowing Background Effect */
.hero-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100vw;
  height: 100vh;
  background: var(--gradient-hero);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-section h1 {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: var(--font-weight-extrabold);
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: var(--gradient-text); /* Use variable instead of hardcoded white */
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: var(--shadow-neon); /* Use variable */
  animation: fadeUp 1s ease-out;
}

.hero-section .lead {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  font-weight: var(--font-weight-normal);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeUp 1s ease-out 0.2s backwards;
}

/* Tech Subtitle Pill */
.tech-subtitle {
  font-family: var(--font-family-base);
  color: var(--color-primary);
  background: rgba(6, 182, 212, 0.05); /* Light cyan tint */
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  display: inline-block;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(6, 182, 212, 0.2);
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
  font-weight: var(--font-weight-medium);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.05);
  animation: fadeUp 1s ease-out 0.4s backwards;
}

/* Hero Buttons */
.cta-buttons .btn-outline-light {
    color: var(--color-text);
    border-color: var(--color-text);
}

.cta-buttons .btn-outline-light:hover {
    background-color: var(--color-text);
    color: var(--color-background);
}

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

/* Floating Elements */
.floating-elements {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.floating-element {
  position: absolute;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  animation: float 15s infinite linear;
  will-change: transform;
}

.floating-element:nth-child(1) {
  width: 100px;
  height: 100px;
  top: 20%;
  left: 10%;
  animation-duration: 20s;
}

.floating-element:nth-child(2) {
  width: 150px;
  height: 150px;
  top: 60%;
  left: 80%;
  animation-duration: 25s;
}

.floating-element:nth-child(3) {
  width: 70px;
  height: 70px;
  top: 80%;
  left: 30%;
  animation-duration: 15s;
}

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

.btn {
  font-weight: var(--font-weight-medium);
  transition: var(--transition-all);
  border-radius: var(--radius-md);
}

.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  padding: var(--space-sm) var(--space-lg);
}

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

.btn-outline-light:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cta-buttons {
  margin-top: var(--space-xl);
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

/* ========================================
   SOCIAL LINKS
   ======================================== */

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}

.social-links a {
  color: var(--color-text); /* Theme-aware text color */
  font-size: var(--font-size-2xl);
  transition: var(--transition-all);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--glass-bg); /* Theme-aware glass background */
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  text-decoration: none;
}

.social-links a:hover {
  transform: translateY(-5px) scale(1.1);
  background: var(--color-primary);
  color: var(--color-background);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-neon);
}

/* ========================================
   SECTIONS
   ======================================== */

section {
  padding: var(--space-2xl) 0;
}

section h2 {
  font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}

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

.about-section {
  padding: var(--space-3xl) 0;
}

.about-section .lead {
    color: var(--color-text);
}

.icon-box {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(34, 211, 238, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1.25rem;
    transition: var(--transition-base);
}

.glass-panel:hover .icon-box {
    background: var(--color-primary);
    color: var(--color-background);
    transform: scale(1.1) rotate(3deg);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}


/* ========================================
   EXPERIENCE SECTION (Timeline)
   ======================================== */

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

.timeline {
  position: relative;
  padding: var(--space-lg) 0;
}

.timeline-item {
  background: var(--color-surface);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--color-primary);
  transition: var(--transition-all);
}

.timeline-item:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-lg);
}

.timeline-item h3 {
  color: var(--color-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
}

.timeline-item > p {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-medium);
}

.timeline-item ul {
  padding-left: var(--space-lg);
}

.timeline-item li {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ========================================
   SKILLS SECTION
   ======================================== */

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

.skill-category-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-all);
  height: 100%;
}

.skill-category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(6, 182, 212, 0.4);
}

.skill-category-title {
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  border-bottom: 2px solid rgba(33, 150, 243, 0.1);
  padding-bottom: var(--space-sm);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-pill {
  background-color: rgba(33, 150, 243, 0.1);
  color: var(--color-primary-dark);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-base);
}

.skill-category-card:hover .skill-pill {
  background-color: var(--color-primary);
  color: white;
}

.skill-pill:hover {
  transform: scale(1.05);
}

/* Tech Subtitle in Hero */
.tech-subtitle {
  font-size: clamp(var(--font-size-base), 2.5vw, var(--font-size-lg));
  color: var(--color-primary-light);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.5px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

/* ========================================
   PROJECTS SECTION
   ======================================== */

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

.projects-section .card {
  transition: var(--transition-all);
  margin-top: var(--space-md);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-xl);
  overflow: hidden;
  height: 100%;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.projects-section .card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(6, 182, 212, 0.4);
}

.projects-section .card-img-top {
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.projects-section .card:hover .card-img-top {
  transform: scale(1.05);
}

.projects-section .card-body {
  padding: var(--space-lg);
}

.projects-section .card-title {
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

.projects-section .card-text {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

/* Skills Scroll in Project Cards */
.skills-scroll {
  display: flex;
  overflow-x: auto;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  margin: var(--space-md) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) var(--color-background-secondary);
}

.skills-scroll::-webkit-scrollbar {
  height: 6px;
}

.skills-scroll::-webkit-scrollbar-track {
  background: var(--color-background-secondary);
  border-radius: var(--radius-sm);
}

.skills-scroll::-webkit-scrollbar-thumb {
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

.skill-tag {
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  transition: var(--transition-all);
  font-weight: var(--font-weight-medium);
}

.skill-tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background-color: var(--color-primary-dark);
}

/* Project Links */
.project-links {
  margin-top: var(--space-md);
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.project-links .btn {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  transition: var(--transition-all);
  flex: 1;
  min-width: 60px;
}

.project-links .btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-links .btn i {
  font-size: var(--font-size-lg);
}

/* Dark mode fix for project links */
[data-theme="dark"] .project-links .btn-outline-dark {
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] .project-links .btn-outline-dark:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .project-links .btn-outline-dark {
    color: var(--color-text);
    border-color: var(--color-border);
  }

  :root:not([data-theme="light"]) .project-links .btn-outline-dark:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
  }
}

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

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

.form-control {
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  transition: var(--transition-all);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
  background-color: var(--color-surface);
}

.alert {
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-md);
  transition: var(--transition-all);
}

.alert-success {
  background-color: #d4edda;
  border-color: #c3e6cb;
  color: #155724;
}

.alert-danger {
  background-color: #f8d7da;
  border-color: #f5c6cb;
  color: #721c24;
}

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

@keyframes gridMove {
  0% {
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  }

  100% {
    background-position: 20px 20px, 20px 30px, 30px 10px, 10px 20px;
  }
}

@keyframes float {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(30px, -50px) rotate(120deg);
  }

  66% {
    transform: translate(-20px, 20px) rotate(240deg);
  }

  100% {
    transform: translate(0, 0) rotate(360deg);
  }
}

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

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

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

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

/* Animate.css Compatibility */
.animate__animated {
  animation-duration: 1s;
  animation-fill-mode: both;
}

.animate-on-scroll {
  opacity: 0;
}

/* ========================================
   RESPONSIVE DESIGN (Mobile-First)
   ======================================== */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
  .hero-section h1 {
    font-size: var(--font-size-4xl);
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .hero-section h1 {
    font-size: var(--font-size-5xl);
  }

  .about-content {
    padding: var(--space-2xl);
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  section {
    padding: var(--space-3xl) 0;
  }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

/* Mobile Optimizations */
@media (max-width: 767px) {
  .hero-section {
    padding-top: 140px; /* Increased to clear fixed navbar + logo */
    min-height: auto;   /* Allow content to define height on mobile */
    padding-bottom: var(--space-xl); /* Add bottom padding */
  }

  .hero-section h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-section .lead {
    font-size: var(--font-size-lg);
  }

  .about-content {
    padding: var(--space-md);
  }

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

  .about-details p {
    font-size: var(--font-size-base);
  }

  /* .skills-grid removed */

  .timeline-item {
    padding: var(--space-md);
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .cta-buttons .btn {
    width: 100%;
  }

  .social-links a {
    width: 45px;
    height: 45px;
    font-size: var(--font-size-xl);
  }
}

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

.spinner-border {
  margin-right: var(--space-sm);
}

.d-none {
  display: none !important;
}

/* Loading State for Images */
.card-img-top[data-loading] {
  background: linear-gradient(
    90deg,
    var(--color-background-secondary) 0%,
    var(--color-background-tertiary) 50%,
    var(--color-background-secondary) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}