:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #111c34;
  --surface-2: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #2563eb;
  --secondary: #3b82f6;
  --accent: #38bdf8;
  --border: rgba(255,255,255,0.1);
  --shadow: 0 20px 60px rgba(0,0,0,0.35);
  --radius: 24px;
}

body.light {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #eef2ff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --secondary: #3b82f6;
  --accent: #38bdf8;
  --border: rgba(15,23,42,0.08);
  --shadow: 0 20px 60px rgba(15,23,42,0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; max-width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: radial-gradient(circle at top left, rgba(56,189,248,0.15), transparent 20%), var(--bg);
  color: var(--text);
  transition: background 0.3s ease, color 0.3s ease;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
main { overflow: hidden; }
.container { width: min(1160px, calc(100vw - 2rem)); max-width: calc(100vw - 2rem); margin: 0 auto; }
.section { padding: 5rem 0; position: relative; }
.section-alt { background: rgba(255,255,255,0.025); }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.section-heading { text-align: center; margin-bottom: 3rem; }
.section-heading h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); margin: 0; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; padding: 0.95rem 1.6rem; border-radius: 999px;
  font-weight: 700; cursor: pointer; transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(90deg, var(--primary), var(--secondary)); color: white; box-shadow: 0 10px 20px rgba(37,99,235,0.2); }
.btn-secondary, .btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: blur(14px); background: rgba(15,23,42,0.7); border-bottom: 1px solid var(--border);
}
body.light .header { background: rgba(248,250,252,0.8); }
.navbar { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 1rem; }
.logo { font-size: 1.4rem; font-weight: 800; letter-spacing: 0.1em; }
.logo span { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 1.35rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); font-weight: 600; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.active::after { content: ''; position: absolute; left: 0; bottom: -6px; width: 100%; height: 2px; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.nav-actions { display: flex; align-items: center; gap: 0.8rem; }
.lang-switcher { display: inline-flex; gap: 0.35rem; padding: 0.25rem; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); }
.lang-btn { border: 0; background: transparent; color: var(--muted); border-radius: 999px; padding: 0.35rem 0.65rem; cursor: pointer; font-weight: 700; }
.lang-btn.active { background: linear-gradient(90deg, var(--primary), var(--accent)); color: white; }
.theme-toggle { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; }
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center; padding: 4rem 0 2rem;
  overflow: hidden;
}
.hero-background {
  position: absolute; inset: 0; background: radial-gradient(circle at 80% 20%, rgba(56,189,248,0.25), transparent 25%), radial-gradient(circle at 20% 80%, rgba(37,99,235,0.2), transparent 20%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 2rem; align-items: center; position: relative; z-index: 1; max-width: 100%; }
.hero-content, .hero-visual, .about-content, .contact-info, .contact-form { min-width: 0; }
.hero h1 { font-size: clamp(2.3rem, 6vw, 4.4rem); margin: 0 0 0.6rem; overflow-wrap: anywhere; line-height: 1.18; }
.hero h1 span { color: var(--accent); }
.hero h2 { font-size: clamp(1.35rem, 3vw, 1.8rem); min-height: 2rem; color: var(--secondary); margin: 0 0 1rem; }
.hero-description { font-size: 1.05rem; color: var(--muted); max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2rem 0 1.5rem; }
.social-links { display: flex; gap: 1rem; margin-top: 1rem; }
.social-links a { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; background: var(--surface); border: 1px solid var(--border); }
.hero-card {
  padding: 1rem; border-radius: 32px; background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.04)); border: 1px solid var(--border); box-shadow: var(--shadow); backdrop-filter: blur(20px);
}
.hero-card img { border-radius: 24px; object-fit: cover; aspect-ratio: 4 / 5; }
.scroll-down { position: absolute; left: 50%; bottom: 2rem; transform: translateX(-50%); color: var(--accent); font-size: 1.2rem; animation: bounce 1.8s infinite; }
.about-grid, .contact-grid { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 2rem; align-items: start; }
.about-image img, .contact-info { border-radius: var(--radius); box-shadow: var(--shadow); }
.about-image img { height: 100%; min-height: 340px; object-fit: cover; }
.about-content p { color: var(--muted); }
.info-list { display: grid; gap: 0.8rem; margin-top: 1.5rem; }
.info-list div { display: flex; justify-content: space-between; padding: 0.85rem 1rem; border-radius: 14px; background: var(--surface); border: 1px solid var(--border); }
.info-list span { color: var(--muted); }
.skills-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.4rem; }
.skill-group { background: var(--surface); border: 1px solid var(--border); padding: 1.3rem; border-radius: var(--radius); box-shadow: var(--shadow); }
.skill-group h3 { margin-top: 0; margin-bottom: 1rem; }
.skill-item { margin-bottom: 0.95rem; }
.skill-item span { display: block; margin-bottom: 0.4rem; font-weight: 600; }
.progress { height: 10px; border-radius: 999px; background: rgba(148,163,184,0.25); overflow: hidden; }
.progress div { height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.projects-grid, .certificates-grid, .blog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.4rem; }
.project-card, .certificate-card, .blog-card, .stat-card, .achievement-card, .testimonial-card, .timeline-card, .contact-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.project-card { overflow: hidden; display: flex; flex-direction: column; min-height: 100%; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.project-card:hover { transform: translateY(-6px); box-shadow: 0 25px 70px rgba(0,0,0,0.28); }
.project-media { overflow: hidden; }
.project-media img { aspect-ratio: 16 / 10; object-fit: cover; transition: transform 0.3s ease; }
.project-card:hover .project-media img { transform: scale(1.04); }
.project-card-content { padding: 1.2rem; display: flex; flex-direction: column; gap: 0.6rem; flex: 1; }
.project-card-content h3 { margin: 0; }
.project-topline { display: flex; align-items: center; justify-content: space-between; }
.project-badge { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.35rem 0.7rem; border-radius: 999px; background: rgba(56,189,248,0.1); color: var(--accent); font-size: 0.77rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.18em; }
.project-meta { color: var(--accent); font-size: 0.94rem; margin: 0; font-weight: 600; }
.project-card-content p { color: var(--muted); margin: 0; }
.project-links { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: auto; padding-top: 0.4rem; }
.project-links .btn { padding: 0.7rem 1rem; font-size: 0.94rem; border-radius: 999px; }
.project-links .btn-primary { box-shadow: none; }
.project-links .btn-secondary { border-color: var(--border); }
.timeline { position: relative; padding-left: 1rem; }
.timeline::before { content: ''; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: linear-gradient(var(--accent), var(--primary)); }
.timeline-item { position: relative; padding-left: 2rem; margin-bottom: 1.2rem; }
.timeline-dot { position: absolute; left: 3px; top: 0.4rem; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: 3px solid var(--bg); box-shadow: 0 0 0 3px rgba(56,189,248,0.3); }
.timeline-card { padding: 1.2rem; }
.timeline-meta { color: var(--accent); font-weight: 600; }
.certificates-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.certificate-card { padding: 1.25rem; }
.certificate-card a { color: var(--accent); font-weight: 700; }
.achievements-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.achievement-card { padding: 1rem 1.2rem; font-weight: 600; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
.stat-card { padding: 1.5rem; text-align: center; }
.stat-card h3 { margin: 0; font-size: 2rem; color: var(--accent); }
.testimonial-slider { position: relative; max-width: 720px; margin: 0 auto; }
.testimonial-card { display: none; padding: 1.6rem; text-align: center; }
.testimonial-card.active { display: block; }
.testimonial-card img { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; margin: 0 auto 1rem; }
.blog-card { padding: 1.25rem; }
.contact-form { padding: 1.25rem; display: grid; gap: 0.9rem; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 0.95rem 1rem; border-radius: 14px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
}
.contact-info ul { list-style: none; padding: 0; margin: 1rem 0 0; color: var(--muted); }
.contact-info li { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 0.8rem; }
.footer { padding: 3rem 0 1.2rem; border-top: 1px solid var(--border); margin-top: 1rem; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 2rem; }
.footer h3 { margin-top: 0; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.55rem; color: var(--muted); }
.footer-bottom { padding-top: 1.2rem; margin-top: 1.2rem; border-top: 1px solid var(--border); color: var(--muted); }
.back-to-top {
  position: fixed; right: 1.2rem; bottom: 1.2rem; width: 48px; height: 48px; border-radius: 50%; border: 0; cursor: pointer;
  background: linear-gradient(90deg, var(--primary), var(--accent)); color: white; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(12px); transition: all 0.3s ease; z-index: 1100;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: linear-gradient(90deg, var(--accent), var(--primary)); z-index: 1200; }
.menu-toggle { display: none; background: transparent; border: 0; cursor: pointer; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--text); }