/* ===== CSS RESET & VARIABLES ===== */
:root {
  /* Color Palette - Modern and Vibrant */
  --primary-blue: #1e40af;
  --primary-dark: #0f172a;
  --primary-light: #60a5fa;
  --accent-gold: #f59e0b;
  --accent-teal: #14b8a6;
  --neutral-white: #ffffff;
  --neutral-light: #f3f4f6;
  --neutral-gray: #6b7280;
  --neutral-dark: #1f2937;
  --success-green: #10b981;
  --warning-orange: #f97316;
  --error-red: #ef4444;

  /* Typography */
  --font-primary: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-heading: "Poppins", "Inter", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.25);

  /* Gradients */
  --gradient-primary: linear-gradient(
    135deg,
    var(--primary-blue),
    var(--primary-light)
  );
  --gradient-accent: linear-gradient(
    135deg,
    var(--accent-gold),
    var(--accent-teal)
  );
  --gradient-dark: linear-gradient(135deg, var(--primary-dark), #1e293b);

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.4s ease-in-out;
  --transition-slow: 0.6s ease-in-out;
}

/* ===== BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--neutral-dark);
  background: var(--neutral-light);
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--primary-dark);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  position: relative;
  display: inline-block;
}

h2::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 80px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--space-md);
  color: var(--neutral-gray);
  font-size: 1rem;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--neutral-dark);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--neutral-white);
  box-shadow: var(--shadow-md);
}

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

.btn-accent {
  background: var(--gradient-accent);
  color: var(--neutral-white);
  box-shadow: var(--shadow-md);
}

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

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(30, 58, 138, 0.9), rgba(15, 23, 42, 0.95)),
    url("../images/hero-bg.jpg") center/cover;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--neutral-white);
  max-width: 800px;
  margin: 0 auto;
  animation: fadeInUp 1s ease-in-out;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  margin-bottom: var(--space-2xl);
  color: #cbd5e1;
  font-weight: 300;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--neutral-white);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-2xl);
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-xl);
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
  }

  .hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-dark);
    transition: all var(--transition-normal);
  }

  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

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

@media (max-width: 480px) {
  .section {
    padding: var(--space-2xl) 0;
  }

  .feature-card,
  .project-card {
    padding: var(--space-lg);
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.mt-0 {
  margin-top: 0;
}
.mt-1 {
  margin-top: var(--space-xs);
}
.mt-2 {
  margin-top: var(--space-sm);
}
.mt-3 {
  margin-top: var(--space-md);
}
.mt-4 {
  margin-top: var(--space-lg);
}
.mt-5 {
  margin-top: var(--space-xl);
}
.mt-6 {
  margin-top: var(--space-2xl);
}
.mt-7 {
  margin-top: var(--space-3xl);
}

.mb-0 {
  margin-bottom: 0;
}
.mb-1 {
  margin-bottom: var(--space-xs);
}
.mb-2 {
  margin-bottom: var(--space-sm);
}
.mb-3 {
  margin-bottom: var(--space-md);
}
.mb-4 {
  margin-bottom: var(--space-lg);
}
.mb-5 {
  margin-bottom: var(--space-xl);
}
.mb-6 {
  margin-bottom: var(--space-2xl);
}
.mb-7 {
  margin-bottom: var(--space-3xl);
}

.p-0 {
  padding: 0;
}
.p-1 {
  padding: var(--space-xs);
}
.p-2 {
  padding: var(--space-sm);
}
.p-3 {
  padding: var(--space-md);
}
.p-4 {
  padding: var(--space-lg);
}
.p-5 {
  padding: var(--space-xl);
}
.p-6 {
  padding: var(--space-2xl);
}
.p-7 {
  padding: var(--space-3xl);
}

.d-flex {
  display: flex;
}
.d-grid {
  display: grid;
}
.d-none {
  display: none;
}
.d-block {
  display: block;
}
.d-inline {
  display: inline;
}
.d-inline-block {
  display: inline-block;
}

.flex-column {
  flex-direction: column;
}
.flex-row {
  flex-direction: row;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.align-center {
  align-items: center;
}
.align-start {
  align-items: flex-start;
}
.align-end {
  align-items: flex-end;
}

.w-100 {
  width: 100%;
}
.h-100 {
  height: 100%;
}

.rounded {
  border-radius: var(--radius-md);
}
.rounded-lg {
  border-radius: var(--radius-lg);
}
.rounded-xl {
  border-radius: var(--radius-xl);
}
.rounded-full {
  border-radius: var(--radius-full);
}

.shadow {
  box-shadow: var(--shadow-md);
}
.shadow-lg {
  box-shadow: var(--shadow-lg);
}
.shadow-xl {
  box-shadow: var(--shadow-xl);
}

.bg-primary {
  background: var(--gradient-primary);
}
.bg-dark {
  background: var(--gradient-dark);
}
.bg-light {
  background: var(--neutral-light);
}
.bg-white {
  background: var(--neutral-white);
}

.text-white {
  color: var(--neutral-white);
}
.text-primary {
  color: var(--primary-blue);
}
.text-dark {
  color: var(--primary-dark);
}
.text-gray {
  color: var(--neutral-gray);
}
.text-accent {
  color: var(--accent-gold);
}

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

.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;
}

/* ===== PRINT STYLES ===== */
@media print {
  .header,
  .footer,
  .btn {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.4;
    color: #000;
  }

  .container {
    max-width: none;
  }
}