/* =====================================================
   Main Stylesheet - Abhimanyu Dudeja Portfolio
   Shared styles, variables, and base components
   ===================================================== */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors - Coral/Pink accent theme */
  --color-primary: #ff6b6b;
  --color-primary-dark: #ee5a5a;
  --color-primary-light: #ff8787;
  --color-secondary: #4ecdc4;
  --color-accent: #ffe66d;

  /* Neutrals */
  --color-dark: #1a1a2e;
  --color-dark-light: #16213e;
  --color-gray-900: #212529;
  --color-gray-800: #343a40;
  --color-gray-700: #495057;
  --color-gray-600: #6c757d;
  --color-gray-500: #adb5bd;
  --color-gray-400: #ced4da;
  --color-gray-300: #dee2e6;
  --color-gray-200: #e9ecef;
  --color-gray-100: #f8f9fa;
  --color-white: #ffffff;

  /* Typography */
  --font-primary:
    "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: "Playfair Display", Georgia, serif;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --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;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg:
    0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl:
    0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-gray-900);
}

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

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

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

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

ul {
  list-style: none;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-text {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link:hover,
.nav-link-active {
  color: var(--color-primary);
}

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

.nav-toggle {
  display: none;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: var(--z-modal);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-gray-800);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.hamburger {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

.nav-toggle.active .hamburger {
  background-color: transparent;
}

.nav-toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* Main Content */
.main-content {
  flex: 1;
  margin-top: 80px;
}

/* Section Styles */
.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-12);
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-primary-light)
  );
  margin: var(--space-4) auto 0;
  border-radius: var(--radius-full);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  color: var(--color-white);
  border: none;
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-gray-800);
  border: 2px solid var(--color-gray-300);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Footer */
.footer {
  background-color: var(--color-gray-100);
  padding: var(--space-8) var(--space-6);
  margin-top: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-text {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  margin-bottom: var(--space-2);
}

.footer-contact {
  font-size: var(--text-sm);
}

.footer-link {
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
}

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

.footer-ai-note {
  font-size: var(--text-xs);
  color: var(--color-gray-400);
  font-style: italic;
  margin-top: var(--space-2);
}

/* Page Header */
.page-header {
  text-align: center;
  padding: var(--space-16) var(--space-6) var(--space-12);
  background: linear-gradient(
    135deg,
    var(--color-gray-100) 0%,
    var(--color-white) 100%
  );
}

.page-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  background: linear-gradient(
    135deg,
    var(--color-gray-900),
    var(--color-gray-700)
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.5rem;
    --text-6xl: 3rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-8);
    transition: right var(--transition-base);
  }

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

  .nav-link {
    font-size: var(--text-xl);
  }

  .main-content {
    margin-top: 70px;
  }

  .page-header {
    padding: var(--space-12) var(--space-4) var(--space-8);
  }

  .page-title {
    font-size: var(--text-4xl);
  }

  .section-title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: var(--space-3) var(--space-4);
  }

  .btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
  }
}