:root {
  --accent: #22d3ee;
  --accent-dim: #0e7490;
  --bg-base: #0b1220;
  --bg-alt: #0f172a;
  --border: #1e293b;
}

:root[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-alt: #eef2f7;
  --border: #dbe3ec;
}

* {
  scroll-behavior: smooth;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-base);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ---------- Light mode overrides ---------- */
:root[data-theme="light"] body {
  background-color: var(--bg-base) !important;
  color: #1e293b !important;
}
:root[data-theme="light"] .bg-slate-950 { background-color: var(--bg-base) !important; }
:root[data-theme="light"] .bg-slate-900\/40 { background-color: var(--bg-alt) !important; }
:root[data-theme="light"] .text-slate-200 { color: #1e293b !important; }
:root[data-theme="light"] .text-slate-300 { color: #334155 !important; }
:root[data-theme="light"] .text-slate-400 { color: #475569 !important; }
:root[data-theme="light"] .text-slate-500 { color: #64748b !important; }
:root[data-theme="light"] .text-white { color: #0f172a !important; }
:root[data-theme="light"] .border-slate-700,
:root[data-theme="light"] .border-slate-800,
:root[data-theme="light"] .border-slate-800\/60 { border-color: var(--border) !important; }
:root[data-theme="light"] #site-header.scrolled { background-color: rgba(248,250,252,0.85) !important; }
:root[data-theme="light"] #mobile-menu { background-color: rgba(248,250,252,0.97) !important; }
:root[data-theme="light"] .card-panel,
:root[data-theme="light"] .project-card,
:root[data-theme="light"] .cert-card { background-color: #ffffff !important; border-color: var(--border) !important; }
:root[data-theme="light"] .skill-tag { background-color: #ffffff !important; border-color: var(--border) !important; color: #334155 !important; }
:root[data-theme="light"] .skill-icon { background-color: rgba(14,116,144,0.08) !important; color: #0e7490 !important; }
:root[data-theme="light"] .tab-btn { border-color: var(--border) !important; color: #475569 !important; }
:root[data-theme="light"] .form-input { background-color: #ffffff !important; border-color: var(--border) !important; color: #1e293b !important; }
:root[data-theme="light"] .hero-grid { opacity: 0.15; }

/* ---------- Header ---------- */
#site-header {
  background-color: transparent;
}
#site-header.scrolled {
  background-color: rgba(11, 18, 32, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-link {
  color: #94a3b8;
  transition: color 0.2s ease;
}
.nav-link:hover {
  color: var(--accent);
}

/* ---------- Hero ---------- */
.hero-grid {
  background-image:
    linear-gradient(rgba(148,163,184,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,163,184,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 40%, transparent 90%);
}
.hero-glow {
  background: radial-gradient(ellipse 60% 50% at 50% 20%, rgba(34,211,238,0.12), transparent 70%);
  pointer-events: none;
}

.typed-cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.scroll-indicator {
  animation: bob 2s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

.headline-badge {
  display: inline-block;
  max-width: 90%;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  color: #94a3b8;
  background-color: rgba(148,163,184,0.04);
}
@media (min-width: 640px) {
  .headline-badge { font-size: 0.8rem; }
}

.stat-card {
  padding: 1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: rgba(148,163,184,0.03);
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  border-radius: 0.6rem;
  background-color: var(--accent);
  color: #06131a;
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(34,211,238,0.25);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  color: #e2e8f0;
  font-weight: 600;
  font-size: 0.9rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.btn-secondary:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
:root[data-theme="light"] .btn-secondary { color: #1e293b !important; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  color: #94a3b8;
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}
.btn-ghost:hover {
  color: var(--accent);
}

.social-icon {
  color: #64748b;
  transition: color 0.2s ease, transform 0.2s ease;
}
.social-icon:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Sections ---------- */
.section-block {
  padding: 6rem 0;
}
.section-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.section-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: #ffffff;
}
:root[data-theme="light"] .section-title { color: #0f172a; }

@media (min-width: 768px) {
  .section-title { font-size: 2.25rem; }
}

.card-panel {
  background-color: rgba(148,163,184,0.03);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card-panel:hover {
  border-color: rgba(34,211,238,0.4);
}

/* ---------- Skills ---------- */
.tab-btn {
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  color: #94a3b8;
  transition: all 0.2s ease;
}
.tab-btn:hover {
  border-color: var(--accent);
  color: #e2e8f0;
}
.tab-btn.active {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #06131a;
}

.skill-tag {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #cbd5e1;
  background-color: rgba(148,163,184,0.03);
  text-align: left;
  transition: all 0.25s ease;
}
.skill-tag:hover {
  border-color: var(--accent);
  color: #ffffff;
  transform: translateY(-2px);
}
.skill-tag:hover .skill-icon {
  background-color: rgba(34,211,238,0.16);
  color: var(--accent);
}
.skill-tag.hidden-tag {
  display: none;
}
.skill-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 0.4rem;
  background-color: rgba(148,163,184,0.08);
  color: #94a3b8;
  transition: background-color 0.25s ease, color 0.25s ease;
}
.skill-icon svg {
  width: 15px;
  height: 15px;
}
.skill-tag-label {
  line-height: 1.25;
}

/* ---------- Timeline ---------- */
.timeline {
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}
.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}
.timeline-item:last-child {
  margin-bottom: 0;
}
.timeline-dot {
  position: absolute;
  left: -1.94rem;
  top: 1.6rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(34,211,238,0.15);
}

/* ---------- Projects ---------- */
.project-card {
  display: block;
  background-color: rgba(148,163,184,0.03);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.project-card:hover {
  border-color: rgba(34,211,238,0.4);
  transform: translateY(-4px);
}
.project-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border-radius: 0.4rem;
  background-color: rgba(34,211,238,0.08);
  color: var(--accent);
}

/* ---------- Languages ---------- */
.lang-meter {
  width: 100%;
  height: 5px;
  border-radius: 999px;
  background-color: rgba(148,163,184,0.12);
  overflow: hidden;
}
.lang-meter-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background-color: var(--accent);
}

/* ---------- Certifications ---------- */
.cert-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background-color: rgba(148,163,184,0.03);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
a.cert-card:hover {
  border-color: rgba(34,211,238,0.4);
  transform: translateY(-3px);
}
.cert-logo {
  width: 52px;
  height: 52px;
  object-fit: contain;
  flex-shrink: 0;
}
.cert-logo-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  background-color: rgba(34,211,238,0.08);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 0.7rem;
  text-align: center;
  padding: 0.25rem;
}
.cert-name {
  color: #ffffff;
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1.3;
  margin-bottom: 0.2rem;
}
:root[data-theme="light"] .cert-name { color: #0f172a; }
.cert-issuer {
  color: #64748b;
  font-size: 0.8rem;
  margin-bottom: 0.35rem;
}
.cert-link {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- Contact ---------- */
.contact-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: #94a3b8;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}
a.contact-row:hover {
  color: var(--accent);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: #94a3b8;
  margin-bottom: 0.4rem;
}
.form-input {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background-color: rgba(148,163,184,0.03);
  color: #e2e8f0;
  font-size: 0.9rem;
  transition: border-color 0.2s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.fade-up {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.8s ease forwards;
}
.fade-up-delay-1 { animation-delay: 0.1s; }
.fade-up-delay-2 { animation-delay: 0.2s; }
.fade-up-delay-3 { animation-delay: 0.3s; }
.fade-up-delay-4 { animation-delay: 0.4s; }
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}