/* ============================================
   Glassmorphism Design System
   ============================================ */
:root {
  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Base Colors (Dark Default) */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-primary: #38bdf8; /* Sky Blue */
  --accent-secondary: #818cf8; /* Indigo */

  /* Glassmorphism */
  --glass-bg: rgba(30, 41, 59, 0.4);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-highlight: rgba(255, 255, 255, 0.05);
  --glass-shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --backdrop-blur: blur(12px);

  /* Gradients */
  --gradient-hero:
    radial-gradient(
      circle at top right,
      rgba(56, 189, 248, 0.2),
      transparent 40%
    ),
    radial-gradient(
      circle at bottom left,
      rgba(129, 140, 248, 0.2),
      transparent 40%
    );
  --gradient-text: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);

  /* Spacing & Layout */
  --container-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='light'] {
  --bg-primary: #f0f9ff;
  --bg-secondary: #e0f2fe;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-primary: #0284c7;
  --accent-secondary: #4f46e5;

  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --glass-highlight: rgba(255, 255, 255, 0.8);
  --glass-shadow:
    0 4px 6px -1px rgba(148, 163, 184, 0.1),
    0 2px 4px -1px rgba(148, 163, 184, 0.06);

  --gradient-hero:
    radial-gradient(
      circle at top right,
      rgba(56, 189, 248, 0.1),
      transparent 40%
    ),
    radial-gradient(
      circle at bottom left,
      rgba(129, 140, 248, 0.1),
      transparent 40%
    );
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image: var(--gradient-hero);
  background-attachment: fixed;
  transition: var(--transition);
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

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

/* ============================================
   Components: Glass Card
   ============================================ */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--glass-border);
  border-top: 1px solid var(--glass-highlight);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-md);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  background: rgba(15, 23, 42, 0.8); /* Fallback */
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

[data-theme='light'] .navbar {
  background: rgba(255, 255, 255, 0.8);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background: var(--glass-highlight);
  transform: rotate(15deg);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-xl) 0;
  position: relative;
}

.hero-content {
  max-width: 800px;
}

.hero-title {
  font-size: clamp(3rem, 5vw, 4.5rem);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.hero-title span {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-primary);
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  color: white;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  background: var(--glass-bg);
}

.btn-secondary:hover {
  background: var(--glass-highlight);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
  text-align: left;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title::after {
  content: '';
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-primary), transparent);
  flex-grow: 1;
  opacity: 0.3;
}

/* ============================================
   About Section
   ============================================ */
.about-content {
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.about-content p {
  margin-bottom: 1.5rem;
}

/* ============================================
   Projects Section
   ============================================ */
.projects-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.project-card {
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--glass-border);
  border-top: 1px solid var(--glass-highlight);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-primary);
  box-shadow: 0 10px 40px -10px rgba(56, 189, 248, 0.2);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: var(--spacing-md);
}

.project-title {
  font-size: 1.75rem;
  color: var(--text-primary);
}

.project-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-weight: 600;
}

.project-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  max-width: 800px;
}

.project-highlights h4,
.project-tech h4,
.project-diagram h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-secondary);
  margin-bottom: var(--spacing-sm);
}

.project-highlights ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-bottom: var(--spacing-md);
}

.project-highlights li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.project-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

.project-tech {
  margin-top: var(--spacing-md);
}

.tech-badges {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.tech-badges img {
  height: 24px;
  opacity: 0.8;
  transition: var(--transition);
}

.tech-badges img:hover {
  opacity: 1;
  transform: scale(1.1);
}

.project-diagram {
  margin-top: var(--spacing-lg);
  background: rgba(0, 0, 0, 0.2);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

/* ============================================
   Skills Section
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-xl);
}

.skill-category {
  background: var(--bg-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.skill-category:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-secondary);
  transform: translateY(-3px);
}

.skill-category h3 {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-badges img {
  height: 28px;
  transition: var(--transition);
}

.skill-badges img:hover {
  transform: scale(1.2);
}

/* ============================================
   Certifications Section
   ============================================ */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-xl);
}

.certification-card {
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--glass-border);
  padding: 2rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
  text-align: center;
}

.certification-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-secondary);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px -10px rgba(56, 189, 248, 0.3);
}

.certification-badge {
  margin-bottom: 1rem;
}

.certification-badge img {
  height: 40px;
}

.certification-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  color: var(--accent-primary);
}

.certification-issuer {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.certification-date {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.certification-id {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: monospace;
  opacity: 0.7;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
  text-align: center;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.contact-link:hover {
  background: var(--accent-primary);
  color: white;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px -5px rgba(56, 189, 248, 0.4);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--spacing-md) 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  opacity: 0.6;
}

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

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

.animate-on-scroll.visible {
  animation: fadeInUp 0.6s ease forwards;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  .hero-title {
    font-size: 3rem;
  }

  .project-header {
    flex-direction: column;
    gap: 0.5rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: stretch;
  }
}