/* ============================================
   CSS Custom Properties (Theme)
   ============================================ */
:root {
  /* Background */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;

  /* Accent */
  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.3);
  --accent-subtle: rgba(0, 212, 255, 0.08);

  /* Text */
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hover-bg: rgba(255, 255, 255, 0.07);
  --glass-hover-border: rgba(0, 212, 255, 0.2);

  /* Misc */
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --transition: 0.3s ease;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: #66e5ff;
}

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

/* ============================================
   Utility
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5em;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
  max-width: 600px;
}

/* Glassmorphism card base */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.4);
}

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

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

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

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

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity 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;
  position: relative;
  overflow: hidden;
}

/* Animated gradient background */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(120, 0, 255, 0.06) 0%, transparent 60%);
  animation: heroPulse 8s ease-in-out infinite alternate;
}

@keyframes heroPulse {
  0% { opacity: 0.6; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 700px;
}

.hero-greeting {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-name .highlight {
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: var(--bg-primary);
}

.hero-cta svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition);
}

.hero-cta:hover svg {
  transform: translateY(2px);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
  animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-indicator .mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: mouseScroll 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes mouseScroll {
  0%, 100% { opacity: 1; top: 6px; }
  50% { opacity: 0.3; top: 18px; }
}

/* ============================================
   About
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.about-card {
  padding: 40px;
}

.about-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.about-card p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.skill-category {
  padding: 32px;
  transition: border-color var(--transition), background var(--transition);
}

.skill-category:hover {
  border-color: var(--glass-hover-border);
  background: var(--glass-hover-bg);
}

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--accent);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  padding: 6px 16px;
  background: var(--accent-subtle);
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--text-primary);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.skill-tag:hover {
  background: rgba(0, 212, 255, 0.15);
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-2px);
}

/* ============================================
   Projects
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.project-card {
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-hover-border);
  box-shadow: 0 12px 40px rgba(0, 212, 255, 0.1), 0 4px 16px rgba(0, 0, 0, 0.3);
}

.project-thumbnail {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}

.project-thumbnail .coming-soon-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
}

.project-thumbnail .placeholder-content {
  text-align: center;
}

.project-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-tech span {
  padding: 4px 12px;
  background: var(--accent-subtle);
  border-radius: 50px;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 16px;
  margin-top: auto;
}

.project-links a {
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.project-links a:hover {
  text-decoration: underline;
}

/* ============================================
   Contact
   ============================================ */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info {
  padding: 40px;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 1.05rem;
}

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

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 1rem;
  transition: color var(--transition), transform var(--transition);
}

.contact-link:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.contact-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.contact-form {
  padding: 40px;
}

.contact-form h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  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(--accent);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  padding: 12px 32px;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  /* Mobile nav */
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: rgba(12, 12, 20, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    transition: right var(--transition);
    border-left: 1px solid var(--glass-border);
  }

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

  .hamburger {
    display: flex;
    z-index: 1001;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  /* Contact */
  .contact-content {
    grid-template-columns: 1fr;
  }

  /* Scroll indicator */
  .scroll-indicator {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-cta {
    padding: 12px 28px;
    font-size: 0.95rem;
  }

  .about-card,
  .contact-info,
  .contact-form {
    padding: 24px;
  }

  .skill-category {
    padding: 24px;
  }

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