/* ===== CSS Variables ===== */
:root {
  /* Light Mode Colors */
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --accent-color: #60a5fa;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --background: #ffffff;
  --background-alt: #f3f4f6;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --navbar-bg: rgba(255, 255, 255, 0.95);

  /* Shared Variables */
  --border-radius: 8px;
  --transition: 0.3s ease;
}

/* Dark Mode Colors */
[data-theme="dark"] {
  --primary-color: #60a5fa;
  --secondary-color: #93c5fd;
  --accent-color: #3b82f6;
  --text-color: #f3f4f6;
  --text-light: #9ca3af;
  --background: #0f172a;
  --background-alt: #1e293b;
  --card-bg: #1e293b;
  --border-color: #334155;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --navbar-bg: rgba(15, 23, 42, 0.95);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: var(--background);
  transition: background var(--transition), color var(--transition);
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--navbar-bg);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 2px 10px var(--shadow-color);
  transition: background var(--transition);
}

.logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--primary-color);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-color);
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  background: var(--background-alt);
  border: 2px solid var(--border-color);
  border-radius: 50px;
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.theme-toggle:hover .theme-icon {
  color: white;
}

.theme-icon {
  font-size: 1.25rem;
  color: var(--text-color);
  transition: color var(--transition);
}

/* Hide/show icons based on theme */
.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 5%;
  background: linear-gradient(135deg, var(--background) 0%, var(--background-alt) 100%);
  transition: background var(--transition);
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1rem;
}

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

.tagline {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

[data-theme="dark"] .cta-button {
  color: #0f172a;
}

.cta-button:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
}

/* ===== Sections ===== */
.section {
  padding: 5rem 10%;
  transition: background var(--transition);
}

.section:nth-child(even) {
  background: var(--background-alt);
}

.section h2 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 2px;
}

/* ===== About Section ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  color: var(--text-light);
  margin-bottom: 1rem;
}

/* ===== Skills Section ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px var(--shadow-color);
  transition: background var(--transition), box-shadow var(--transition);
}

.skill-category h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.skill-category li {
  padding: 0.5rem 0;
  color: var(--text-light);
  border-bottom: 1px solid var(--border-color);
}

.skill-category li:last-child {
  border-bottom: none;
}

/* ===== Projects Grid ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow-color);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px var(--shadow-color);
}

.project-image {
  background: var(--background-alt);
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
}

.project-info {
  padding: 1.5rem;
}

.project-info h3 {
  margin-bottom: 0.5rem;
}

.project-info p {
  color: var(--text-light);
}

.project-links {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: white;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  transition: background var(--transition);
}

[data-theme="dark"] .btn {
  color: #0f172a;
}

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

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

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

[data-theme="dark"] .btn-outline:hover {
  color: #0f172a;
}

/* ===== Contact Form ===== */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  background: var(--card-bg);
  color: var(--text-color);
  transition: border-color var(--transition), background var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-light);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem;
  background: var(--background-alt);
  color: var(--text-color);
  transition: background var(--transition), color var(--transition);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.social-links a {
  color: var(--primary-color);
  font-weight: 500;
  transition: color var(--transition);
}

.social-links a:hover {
  color: var(--secondary-color);
}

.footer p {
  color: var(--text-light);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-150%);
    transition: transform var(--transition);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .menu-toggle {
    display: block;
  }

  .section {
    padding: 3rem 5%;
  }

  .about-content {
    grid-template-columns: 1fr;
  }
}

/* ===== Smooth Theme Transition ===== */
body.theme-transition,
body.theme-transition *,
body.theme-transition *::before,
body.theme-transition *::after {
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease ! important;
}