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

:root {
  --bg:        #0b0f1a;
  --surface:   #111827;
  --border:    #1f2d45;
  --accent:    #38bdf8;
  --accent2:   #818cf8;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --radius:    10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

/* ── Layout helpers ── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 40px;
  color: #f1f5f9;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(11, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

nav .inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: #f1f5f9;
  letter-spacing: 0.02em;
}

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

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

.nav-links a {
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(56,189,248,0.08) 0%, transparent 70%);
}

.hero-tag {
  display: inline-block;
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.3);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}

#hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: #f1f5f9;
  margin-bottom: 20px;
}

#hero h1 .highlight {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hero p {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 560px;
  margin-bottom: 36px;
}

.btn-group { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #0b0f1a;
}

.btn-primary:hover {
  background: #7dd3fc;
  text-decoration: none;
  color: #0b0f1a;
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* ── ABOUT ── */
#about { border-top: 1px solid var(--border); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p { color: var(--muted); margin-bottom: 14px; }
.about-text p:last-child { margin-bottom: 0; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}

.stat-card .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-card .label {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── SKILLS ── */
#skills { border-top: 1px solid var(--border); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

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

.skill-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.skill-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 10px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  background: rgba(56,189,248,0.08);
  border: 1px solid rgba(56,189,248,0.2);
  color: var(--accent);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 999px;
}

/* ── CERTIFICATIONS ── */
#certifications { border-top: 1px solid var(--border); }

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color 0.2s;
}

.cert-card:hover { border-color: var(--accent2); }

.cert-badge {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(129,140,248,0.12);
  border: 1px solid rgba(129,140,248,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.cert-info .cert-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: #f1f5f9;
}

.cert-info .cert-vendor {
  font-size: 0.78rem;
  color: var(--muted);
}

/* ── EXPERIENCE ── */
#experience { border-top: 1px solid var(--border); }

.timeline { position: relative; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2), transparent);
}

.timeline-item {
  padding-left: 36px;
  padding-bottom: 44px;
  position: relative;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -5px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.timeline-date {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.timeline-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #f1f5f9;
}

.timeline-item .company {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 10px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ── PROJECTS ── */
#projects { border-top: 1px solid var(--border); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s, transform 0.2s;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #f1f5f9;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--muted);
  flex: 1;
}

.project-link {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ── CONTACT ── */
#contact {
  border-top: 1px solid var(--border);
  text-align: center;
}

#contact p {
  color: var(--muted);
  max-width: 500px;
  margin: 0 auto 36px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .nav-links { display: none; }
  h2 { font-size: 1.6rem; }
}