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

/* === Custom Properties === */
:root {
  --ink: #ffffff;
  --surface: #1a1a2e;
  --surface-alt: #16213e;
  --border: rgba(255, 255, 255, 0.1);
  --yellow: #e86a33;
  --muted: rgba(255, 255, 255, 0.6);
  --teal: #64ffda;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);
  --glass-blur: blur(10px);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --ink: #1a1a2e;
    --surface: #f0f0f5;
    --surface-alt: #e8e8ed;
    --border: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: 1px solid rgba(0, 0, 0, 0.08);
    --muted: rgba(0, 0, 0, 0.6);
  }
}

/* === Base === */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--surface), var(--surface-alt));
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  line-height: 1.2;
  font-weight: 700;
}

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

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

/* === Layout === */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 48px;
  text-align: center;
}

/* === Accent === */
.accent {
  color: var(--yellow);
}

/* === Glassmorphism === */
.glass-card {
  background: var(--glass-bg);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius);
}

/* === Header / Nav === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(26, 26, 46, 0.8);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

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

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

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

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--yellow);
  margin-bottom: 8px;
  font-weight: 500;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 20px;
}

.hero-description {
  max-width: 560px;
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.stat-number {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--yellow);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--muted);
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--yellow);
  color: #fff;
}

.btn-primary:hover {
  background: #d45a28;
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--yellow);
  color: var(--yellow);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* === Page Hero === */
.page-hero {
  padding: 140px 0 60px;
  text-align: center;
}

.page-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 12px;
}

.page-subtitle {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

/* === About === */
.bio-card {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 40px;
}

.bio-avatar {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 2px solid var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--yellow);
}

.bio-text h2 {
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.bio-text p {
  color: var(--muted);
  margin-bottom: 12px;
  line-height: 1.7;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.skill-card {
  padding: 28px 20px;
  text-align: center;
  transition: transform var(--transition);
}

.skill-card:hover {
  transform: translateY(-4px);
}

.skill-card i {
  font-size: 2.2rem;
  color: var(--yellow);
  margin-bottom: 12px;
}

.skill-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.skill-card p {
  font-size: 0.82rem;
  color: var(--muted);
}

/* Timeline */
.timeline-list {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding: 24px 28px 24px 48px;
  margin-bottom: 20px;
}

.timeline-dot {
  position: absolute;
  left: 6px;
  top: 32px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--yellow);
  border: 3px solid var(--surface);
}

.timeline-year {
  font-size: 0.8rem;
  color: var(--yellow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin: 6px 0 8px;
}

.timeline-content p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* === Projects === */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  padding: 32px;
  transition: transform var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
}

.project-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: rgba(232, 106, 51, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--yellow);
  margin-bottom: 20px;
}

.project-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.project-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.tech-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(100, 255, 218, 0.1);
  color: var(--teal);
  border: 1px solid rgba(100, 255, 218, 0.2);
}

/* === Contact === */
.contact-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: start;
}

.contact-form {
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--yellow);
}

.form-group textarea {
  resize: vertical;
}

.contact-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sidebar-card {
  padding: 24px;
}

.sidebar-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.sidebar-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.sidebar-link {
  color: var(--yellow);
  font-weight: 500;
  transition: color var(--transition);
}

.sidebar-link:hover {
  color: var(--teal);
}

.social-sidebar {
  display: flex;
  gap: 16px;
  margin-top: 4px;
}

.social-sidebar a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}

.social-sidebar a:hover {
  background: var(--yellow);
  color: #fff;
  border-color: var(--yellow);
}

/* === Footer === */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p {
  color: var(--muted);
  font-size: 0.85rem;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  font-size: 1.1rem;
  color: var(--muted);
  transition: color var(--transition);
}

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

/* === Responsive: Tablet === */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    background: var(--surface);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 0;
    transition: right var(--transition);
    border-left: 1px solid var(--border);
  }

  .main-nav.open {
    right: 0;
  }

  .nav-link {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 1.05rem;
  }

  .nav-link::after {
    display: none;
  }

  .hero-stats {
    gap: 32px;
  }

  .bio-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 60px 0;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* === Responsive: Mobile === */
@media (max-width: 500px) {
  .hero-stats {
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .skill-card {
    padding: 20px 12px;
  }

  .contact-form {
    padding: 24px;
  }

  .section-title {
    font-size: 1.6rem;
  }
}