:root {
  --bg: #0a0e1a;
  --bg-2: #0f1424;
  --bg-3: #151b2e;
  --surface: #1a2138;
  --border: rgba(255,255,255,0.08);
  --text: #e8ecf5;
  --text-dim: #9aa4bf;
  --text-mute: #6b7590;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --accent: #06b6d4;
  --success: #10b981;
  --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --shadow: 0 20px 60px -20px rgba(99,102,241,0.4);
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,14,26,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; gap: 24px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 18px; letter-spacing: -0.02em;
}
.logo-mark {
  background: var(--gradient); -webkit-background-clip: text;
  background-clip: text; color: transparent; font-size: 22px;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text-dim);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-dim); padding: 6px 10px; border-radius: 8px;
  font-size: 12px; font-weight: 600; cursor: pointer; font-family: inherit;
  transition: all 0.2s;
}
.lang-toggle:hover { border-color: var(--primary); color: var(--text); }
.lang-toggle .lang-active { color: var(--text); }
.lang-toggle .lang-sep { margin: 0 4px; color: var(--text-mute); }

.menu-toggle {
  display: none; background: transparent; border: none; cursor: pointer;
  flex-direction: column; gap: 4px; padding: 8px;
}
.menu-toggle span {
  width: 22px; height: 2px; background: var(--text); border-radius: 2px;
  transition: 0.3s;
}

/* BUTTONS */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 14px;
  border: none; cursor: pointer; font-family: inherit;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient); color: white;
  box-shadow: 0 8px 24px -8px rgba(99,102,241,0.6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px -8px rgba(99,102,241,0.8); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--surface); border-color: var(--primary); }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* HERO */
.hero {
  position: relative; padding: 120px 0 100px; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(99,102,241,0.25), transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(139,92,246,0.2), transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(6,182,212,0.15), transparent 50%);
}
.hero-inner { position: relative; text-align: center; max-width: 900px; margin: 0 auto; }
.badge {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.3);
  color: #a5b4fc; font-size: 13px; font-weight: 500; margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(36px, 6vw, 64px); line-height: 1.1;
  font-weight: 800; letter-spacing: -0.03em; margin-bottom: 24px;
}
.hero-title span { display: inline-block; margin-right: 8px; }
.gradient-text {
  background: var(--gradient); -webkit-background-clip: text;
  background-clip: text; color: transparent;
}
.hero-sub {
  font-size: 18px; color: var(--text-dim); max-width: 640px;
  margin: 0 auto 36px;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 48px; justify-content: center; margin-top: 64px;
  flex-wrap: wrap;
}
.hero-stats div { display: flex; flex-direction: column; gap: 4px; }
.hero-stats strong {
  font-size: 32px; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text;
  background-clip: text; color: transparent;
}
.hero-stats span { font-size: 13px; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.05em; }

/* SECTIONS */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 700px; margin: 0 auto 60px; }
.kicker {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--primary); text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.section h2 {
  font-size: clamp(28px, 4vw, 42px); font-weight: 800;
  letter-spacing: -0.02em; margin-bottom: 16px;
}
.section-head p { color: var(--text-dim); font-size: 17px; }

/* GRID */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }

/* CARDS */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  position: relative;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(99,102,241,0.4);
  box-shadow: var(--shadow);
}
.card-icon {
  font-size: 32px; margin-bottom: 16px;
  display: inline-flex; padding: 12px; border-radius: 12px;
  background: rgba(99,102,241,0.1);
}
.card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 14.5px; }

/* PROJECTS */
.project-card { overflow: hidden; padding: 0; }
.project-cover {
  height: 180px; background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 56px; position: relative;
}
.project-cover::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.15), transparent 60%);
}
.project-body { padding: 24px; }
.project-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 14px; }
.project-tag {
  font-size: 11px; padding: 4px 10px; border-radius: 999px;
  background: rgba(99,102,241,0.12); color: #a5b4fc; font-weight: 500;
}
.project-link {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 18px; font-size: 14px; font-weight: 600;
  color: var(--primary); transition: gap 0.2s, color 0.2s;
}
.project-link:hover { color: var(--accent); gap: 8px; }
.project-status {
  position: absolute; top: 14px; right: 14px;
  font-size: 11px; padding: 4px 10px; border-radius: 999px;
  background: rgba(0,0,0,0.4); color: white; backdrop-filter: blur(8px);
  font-weight: 600;
}

/* ABOUT */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }
.about-grid h2 { margin: 12px 0 20px; }
.about-grid p { color: var(--text-dim); margin-bottom: 16px; }
.check-list { list-style: none; margin-top: 24px; }
.check-list li {
  padding: 10px 0; padding-left: 30px; position: relative; color: var(--text-dim);
}
.check-list li::before {
  content: '✓'; position: absolute; left: 0; top: 10px;
  color: var(--success); font-weight: 700;
}
.about-visual { display: flex; justify-content: center; }
.floating-card {
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; width: 100%; max-width: 420px;
  box-shadow: var(--shadow); animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.dot-row { display: flex; gap: 6px; margin-bottom: 12px; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: #ff5f56; } .dot.y { background: #ffbd2e; } .dot.g { background: #27c93f; }
.code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 13px; line-height: 1.7; color: var(--text-dim);
  white-space: pre; overflow-x: auto;
}
.c-key { color: #c084fc; } .c-var { color: #60a5fa; }
.c-prop { color: #93c5fd; } .c-str { color: #6ee7b7; } .c-num { color: #fcd34d; }

/* TESTIMONIALS */
.testimonial { display: flex; flex-direction: column; }
.testimonial-quote {
  color: var(--text-dim); font-style: italic; flex-grow: 1;
  font-size: 15px; line-height: 1.7;
}
.testimonial-quote::before { content: '"'; font-size: 40px; color: var(--primary); line-height: 0; }
.testimonial-author { display: flex; align-items: center; gap: 12px; margin-top: 20px; }
.avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gradient); display: flex; align-items: center;
  justify-content: center; font-weight: 700; color: white;
}
.testimonial-author strong { display: block; font-size: 14px; }
.testimonial-author span { font-size: 12px; color: var(--text-mute); }

/* CONTACT */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-grid h2 { margin: 12px 0 16px; }
.contact-grid > div > p { color: var(--text-dim); margin-bottom: 24px; }
.contact-info { display: flex; flex-direction: column; gap: 14px; }
.contact-info div { display: flex; align-items: center; gap: 12px; color: var(--text-dim); }
.contact-info span:first-child {
  width: 36px; height: 36px; display: inline-flex; align-items: center;
  justify-content: center; background: rgba(99,102,241,0.1); border-radius: 10px;
  color: var(--primary);
}
.contact-info a:hover { color: var(--primary); }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.contact-form label { display: flex; flex-direction: column; gap: 6px; }
.contact-form span { font-size: 13px; font-weight: 500; color: var(--text-dim); }
.contact-form input, .contact-form textarea {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; color: var(--text);
  font-family: inherit; font-size: 14px; transition: border-color 0.2s;
  resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--primary);
}
.form-note { font-size: 13px; color: var(--success); min-height: 18px; }

/* FOOTER */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-2); padding: 40px 0;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  gap: 24px; flex-wrap: wrap;
}
.muted { color: var(--text-mute); font-size: 14px; }
.small { font-size: 13px; }

/* MOBILE */
@media (max-width: 768px) {
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg-2); flex-direction: column;
    padding: 24px; border-bottom: 1px solid var(--border);
    transform: translateY(-110%); transition: transform 0.3s;
  }
  .nav-links.open { transform: translateY(0); }
  .menu-toggle { display: flex; }
  .nav-actions .btn { display: none; }
  .hero { padding: 60px 0 80px; }
  .section { padding: 70px 0; }
  .hero-stats { gap: 32px; margin-top: 48px; }
}

/* ANIMATIONS */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s, transform 0.6s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }