/* ============================================
   PREMIUM DESIGN SYSTEM - Apple-Inspired
   ============================================ */

:root {
  /* Color Palette - Dark Mode Default */
  --color-bg-primary: #000000;
  --color-bg-secondary: #0a0a0a;
  --color-bg-tertiary: #1a1a1a;

  /* Vibrant Accents */
  --color-accent-purple: #a855f7;
  --color-accent-blue: #3b82f6;
  --color-accent-cyan: #06b6d4;
  --color-accent-pink: #ec4899;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-service-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-service-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-service-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;

  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(20px);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-2xl: 8rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.875rem;
  --font-size-sm: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  --font-size-3xl: 4rem;
  --font-size-4xl: 5rem;

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

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.4);
}

/* Light Mode Variables */
body.light-mode {
  --color-bg-primary: #f8fafc;
  --color-bg-secondary: #f1f5f9;
  --color-bg-tertiary: #e2e8f0;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.1);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 8vw, var(--font-size-4xl));
}

h2 {
  font-size: clamp(2rem, 6vw, var(--font-size-3xl));
}

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

p {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

.section {
  padding: var(--spacing-2xl) 0;
  position: relative;
}

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

.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

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

.logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

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

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

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

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

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

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

.theme-toggle, .lang-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-primary);
  padding: 8px 12px;
  border-radius: 50px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover, .lang-toggle:hover {
  transform: scale(1.05);
  border-color: var(--color-accent-purple);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.sun-icon { display: none; }
body.light-mode .sun-icon { display: block; }
body.light-mode .moon-icon { display: none; }

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%);
  z-index: 0;
}

.hero-background::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(118, 75, 162, 0.1) 0%, transparent 70%);
  animation: rotate 30s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
}

.hero-title {
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 1s ease;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 1s ease 0.2s backwards;
}

.hero-cta {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: var(--gradient-primary);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: var(--font-size-md);
  transition: all var(--transition-base);
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
  animation: fadeInUp 1s ease 0.4s backwards;
  position: relative;
  overflow: hidden;
}

.hero-cta::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 0.5s;
}

.hero-cta:hover::before {
  left: 100%;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(102, 126, 234, 0.5);
}

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

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

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator::before {
  content: '↓';
  font-size: 2rem;
  color: var(--color-text-secondary);
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  40% {
    transform: translateX(-50%) translateY(-10px);
  }

  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
  background: var(--color-bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about-text h2 {
  margin-bottom: var(--spacing-md);
}

.about-visual {
  position: relative;
  height: 400px;
  border-radius: 24px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.about-visual::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

/* ============================================
   EXPERIENCE SECTION (TIMELINE)
   ============================================ */

.experience {
  background: var(--color-bg-primary);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0.3;
}

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

.timeline-dot {
  position: absolute;
  left: -2.35rem;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--gradient-primary);
  border-radius: 50%;
  border: 4px solid var(--color-bg-primary);
  box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
  z-index: 2;
}

.timeline-content {
  padding: var(--spacing-md);
  transition: transform var(--transition-base);
}

.timeline-content:hover {
  transform: translateX(10px);
}

.timeline-date {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent-purple);
  margin-bottom: 0.5rem;
  display: block;
}

.timeline-content h3 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.timeline-content h4 {
  font-size: 1rem;
  color: var(--color-text-primary);
  opacity: 0.8;
  margin-bottom: 0.5rem;
}

/* ============================================
   SERVICES SECTION
   ============================================ */

.services {
  background: var(--color-bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-sm);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
}

.service-card.animate {
  animation: fadeInUp 0.6s ease forwards;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:nth-child(1)::before {
  background: var(--gradient-service-1);
}

.service-card:nth-child(2)::before {
  background: var(--gradient-service-2);
}

.service-card:nth-child(3)::before {
  background: var(--gradient-service-3);
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  display: inline-block;
  transition: transform var(--transition-base);
}

.service-icon svg {
  width: 80px;
  height: 80px;
  display: block;
  filter: drop-shadow(0 4px 12px rgba(102, 126, 234, 0.3));
  transition: all var(--transition-base);
}

.service-card:hover .service-icon {
  transform: scale(1.1) rotate(5deg);
}

.service-card:hover .service-icon svg {
  filter: drop-shadow(0 8px 20px rgba(102, 126, 234, 0.6));
  animation: iconPulse 2s ease-in-out infinite;
}

@keyframes iconPulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* About Section Icon */
.about-icon {
  width: 200px;
  height: 200px;
  filter: drop-shadow(0 8px 24px rgba(102, 126, 234, 0.5));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {

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

  33% {
    transform: translateY(-20px) rotate(5deg);
  }

  66% {
    transform: translateY(-10px) rotate(-5deg);
  }
}

.service-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.service-description {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.service-features {
  list-style: none;
  margin-top: var(--spacing-md);
}

.service-features li {
  color: var(--color-text-secondary);
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: var(--font-size-sm);
}

.service-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent-purple);
  font-weight: bold;
}

/* ============================================
   PORTFOLIO SECTION
   ============================================ */

.portfolio {
  background: var(--color-bg-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-md);
}

.portfolio-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.portfolio-visual {
  height: 200px;
  background: rgba(255, 255, 255, 0.02);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--glass-border);
  position: relative;
}

.project-svg {
  width: 100%;
  height: 100%;
  padding: 2rem;
}

.draw-path {
  stroke-dasharray: 500;
  stroke-dashoffset: 500;
  animation: draw 3s ease forwards infinite alternate;
}

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

.rotate-svg {
  transform-origin: center;
  animation: rotateSvg 10s linear infinite;
}

@keyframes rotateSvg {
  to { transform: rotate(360deg); }
}

.portfolio-info {
  padding: var(--spacing-md);
}

.portfolio-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact {
  background: var(--color-bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.contact-content {
  text-align: left;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

.contact-item:hover {
  transform: translateX(8px);
  border-color: var(--color-accent-purple);
}

.contact-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent-purple);
}

.social-icons {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.social-icon {
  width: 44px;
  height: 44px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.social-icon:hover {
  color: var(--color-text-primary);
  border-color: var(--color-accent-purple);
  transform: translateY(-4px);
}

.social-icon svg {
  width: 24px;
  height: 24px;
}

/* Form Styles */
.contact-form-container {
  padding: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--color-text-primary);
  font-family: inherit;
  transition: all var(--transition-base);
}

body.light-mode .form-group input,
body.light-mode .form-group textarea {
  background: rgba(0, 0, 0, 0.03);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent-purple);
  background: rgba(255, 255, 255, 0.06);
}

.submit-btn {
  width: 100%;
  padding: 1rem;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.form-status {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  text-align: center;
  display: none;
  animation: fadeIn 0.3s ease;
}

.form-status.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-bg-primary);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-top: 1px solid var(--glass-border);
}

.footer p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 992px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--color-bg-secondary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
    z-index: 999;
    box-shadow: -10px 0 30px rgba(0,0,0,0.5);
  }

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

  .mobile-menu-btn {
    display: block;
    z-index: 1001;
  }

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

  .about-visual {
    height: 300px;
  }

  .about-icon {
    width: 150px;
    height: 150px;
  }

  .services-grid, .portfolio-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 5rem;
  }

  .service-card, .contact-form-container {
    padding: var(--spacing-md);
  }
}

/* ============================================
   ANIMATIONS & EFFECTS
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Smooth reveal on scroll */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].animated {
  opacity: 1;
  transform: translateY(0);
}