/* ===== VARIABLES ===== */
:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #263347;
  --accent: #818cf8;
  --accent-dim: rgba(129, 140, 248, 0.15);
  --accent-glow: rgba(129, 140, 248, 0.35);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.13);
  --radius: 12px;
  --nav-height: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ===== NAV ===== */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}

#nav.scrolled {
  background: rgba(10, 10, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #0a0a12;
  font-weight: 600;
}

.btn-primary:hover {
  background: #a5b4fc;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-large {
  padding: 14px 32px;
  font-size: 1rem;
}

/* ===== HERO ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(129, 140, 248, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(129, 140, 248, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

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

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(129, 140, 248, 0.2);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero-tag::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(129, 140, 248, 0.5), 0 0 8px rgba(255, 255, 255, 0.6);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 0 2px rgba(129, 140, 248, 0.5), 0 0 8px rgba(255,255,255,0.6); }
  50% { opacity: 0.8; transform: scale(0.85); box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.3), 0 0 14px rgba(255,255,255,0.4); }
}

#hero h1 {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 16px;
}

.hero-role {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--muted);
  margin-bottom: 20px;
  font-weight: 400;
}

.hero-desc {
  max-width: 520px;
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
}

.hero-scroll span {
  display: block;
  width: 2px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, #fff);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
  border-radius: 2px;
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===== SECTIONS ===== */
section { padding: 100px 0; }

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ===== FADE IN ===== */
.fade-section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 60px;
  align-items: start;
}

.about-text p {
  color: var(--muted);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.75;
}

.about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.chip {
  padding: 5px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--muted);
  transition: all 0.2s;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-card-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.about-card-line:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.about-card-line .label {
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== PROJECTS ===== */
#projects { background: var(--surface); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.project-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
  border-color: rgba(129, 140, 248, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.project-icon {
  font-size: 1.5rem;
}

.project-links {
  display: flex;
  gap: 8px;
}

.icon-link {
  color: var(--muted);
  transition: color 0.2s;
}

.icon-link:hover { color: var(--accent); }

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
}

.project-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 999px;
  border: 1px solid rgba(129, 140, 248, 0.15);
}

/* ===== CONTACT ===== */
.contact-container {
  text-align: center;
  max-width: 600px;
}

.contact-desc {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 36px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 32px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.social-link:hover { color: var(--accent); }

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    flex-direction: column;
    gap: 20px;
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: flex; }

  section { padding: 72px 0; }
}