/* ============================================
   PREMIUM DARK THEME DESIGN SYSTEM
   ramkumar.in - Personal Website
   ============================================ */

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a28;
  --color-bg-glass: rgba(26, 26, 40, 0.7);

  /* Accent Colors */
  --color-accent-blue: #00d4ff;
  --color-accent-purple: #a855f7;
  --color-accent-emerald: #10b981;
  --color-accent-orange: #f97316;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #b4b4c8;
  --color-text-muted: #71717a;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #a855f7 100%);
  --gradient-secondary: linear-gradient(135deg, #10b981 0%, #00d4ff 100%);
  --gradient-hero: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  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(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h3 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

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

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

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

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

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--color-bg-primary);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--spacing-md);
}

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  color: var(--color-accent-blue);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
  animation: fadeInUp 0.8s ease;
}

.hero-title {
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-description {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.6s backwards;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-normal);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  font-family: var(--font-primary);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-accent-blue);
}

.btn-secondary:hover {
  background: var(--color-accent-blue);
  color: white;
  transform: translateY(-2px);
}

/* ===== CARDS ===== */
.card {
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: translateY(-3px);
  transition: var(--transition-normal);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 212, 255, 0.3);
}

.card:hover::before {
  transform: translateY(0);
}

/* ===== GRID LAYOUTS ===== */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-description {
  max-width: 700px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  font-size: 1.2rem;
}

/* ===== SKILL TAGS ===== */
.skill-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--color-accent-blue);
  border-radius: 50px;
  color: var(--color-accent-blue);
  font-size: 0.9rem;
  font-weight: 500;
  margin: 0.25rem;
  transition: var(--transition-fast);
}

.skill-tag:hover {
  background: var(--color-accent-blue);
  color: white;
  transform: translateY(-2px);
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-md);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background: var(--color-accent-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--color-bg-secondary);
}

.timeline-date {
  color: var(--color-accent-purple);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.3rem;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.timeline-company {
  color: var(--color-accent-emerald);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

/* ===== PROJECT CARDS ===== */
.project-card {
  position: relative;
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-md);
  transition: var(--transition-slow);
}

.project-card:hover .project-image {
  transform: scale(1.05);
}

.project-info {
  padding: var(--spacing-sm) 0;
}

.project-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.project-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--spacing-sm);
}

.project-link {
  color: var(--color-accent-blue);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.project-link:hover {
  gap: 1rem;
}

/* ===== FORM STYLES ===== */
.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
  font-weight: 500;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 1rem;
  background: var(--color-bg-secondary);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

/* ===== SOCIAL LINKS ===== */
.social-links {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.social-link {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-radius: 50%;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: var(--transition-normal);
  border: 2px solid transparent;
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: translateY(-5px) rotate(5deg);
  box-shadow: var(--shadow-glow);
}

/* ===== BADGE ===== */
.badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid var(--color-accent-purple);
  border-radius: 50px;
  color: var(--color-accent-purple);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

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

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    flex-direction: column;
    background: var(--color-bg-secondary);
    width: 100%;
    padding: 2rem;
    gap: 1.5rem;
    transition: var(--transition-normal);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .nav-toggle {
    display: flex;
  }

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

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

  .btn {
    width: 100%;
    max-width: 300px;
  }
}

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

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

.mt-1 {
  margin-top: var(--spacing-xs);
}

.mt-2 {
  margin-top: var(--spacing-sm);
}

.mt-3 {
  margin-top: var(--spacing-md);
}

.mt-4 {
  margin-top: var(--spacing-lg);
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}

.mb-2 {
  margin-bottom: var(--spacing-sm);
}

.mb-3 {
  margin-bottom: var(--spacing-md);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}