/* ============================================================
   Mike CV — Style principal
   Thème sombre/clair, responsive, moderne
   ============================================================ */

/* --- Variables --- */
:root {
  --bg: #0f1117;
  --bg-alt: #161b22;
  --bg-card: #1c2130;
  --bg-card-hover: #212840;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(99,179,237,0.4);
  --text: #e2e8f0;
  --text-muted: #8892a4;
  --text-dim: #4a5568;
  --accent: #0ea5e9;
  --accent-2: #7c3aed;
  --accent-3: #10b981;
  --accent-glow: rgba(14,165,233,0.15);
  --accent-glow-2: rgba(124,58,237,0.12);
  --placeholder: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --nav-h: 64px;
  --font: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f7ff;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(14,165,233,0.4);
  --text: #1e293b;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --accent: #0284c7;
  --accent-2: #6d28d9;
  --accent-3: #059669;
  --accent-glow: rgba(2,132,199,0.08);
  --accent-glow-2: rgba(109,40,217,0.06);
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--text); }
img { max-width: 100%; }
ul { list-style: none; }

/* --- Container --- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(15,17,23,0.85);
  backdrop-filter: blur(16px) saturate(1.8);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="light"] .nav {
  background: rgba(248,250,252,0.9);
}

.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

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

.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: var(--accent-glow);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.theme-toggle:hover { border-color: var(--accent); transform: rotate(20deg); }

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

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

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

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.hero-glow-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,0.12) 0%, transparent 70%);
  top: -100px; left: -100px;
  animation: floatGlow 8s ease-in-out infinite;
}

.hero-glow-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(124,58,237,0.1) 0%, transparent 70%);
  bottom: 0; right: -50px;
  animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding-top: 60px;
  padding-bottom: 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  font-family: var(--font-mono);
}

.badge-dot {
  width: 8px; height: 8px;
  background: var(--accent-3);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-greeting {
  display: block;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.hero-firstname {
  display: block;
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 60%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 16px;
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 600;
  color: var(--text);
  max-width: 680px;
  line-height: 1.4;
  margin-bottom: 32px;
  border-left: 3px solid var(--accent);
  padding-left: 16px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--accent-glow);
  border: 1px solid rgba(14,165,233,0.2);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 100px;
}

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

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: fadeInDown 1s 1s both;
}

.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--text-dim);
  border-bottom: 2px solid var(--text-dim);
  transform: rotate(45deg);
  animation: bounce 1.5s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(4px); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px rgba(14,165,233,0.3);
}

.btn-primary:hover {
  background: #0284c7;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 32px rgba(14,165,233,0.45);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

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

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

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.section-header {
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text);
}

.section-desc {
  margin-top: 16px;
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  line-height: 1.7;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 64px;
  align-items: start;
}

.about-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.about-availability h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.availability-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.avail-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 100px;
}

.avail-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--text-dim);
}

.avail-open .avail-dot { background: var(--accent-3); }
.avail-dot-info { background: var(--accent); }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.stat-icon { font-size: 1.5rem; margin-bottom: 10px; }

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 4px;
  display: block;
}

.stat-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.skill-group:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow);
}

.skill-group-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.skill-group-icon { font-size: 1.4rem; }

.skill-group-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-badge {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.skill-badge:hover {
  background: var(--accent-glow);
  border-color: rgba(14,165,233,0.3);
  color: var(--accent);
}

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

.highlight-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}

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

.highlight-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.highlight-card strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
}

.highlight-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   EXPERTISE
   ============================================================ */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.expertise-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--transition);
}

.expertise-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.expertise-card:hover::before { opacity: 1; }

.expertise-icon {
  color: var(--accent);
  margin-bottom: 16px;
  opacity: 0.8;
}

.expertise-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.expertise-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.expertise-tags span {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 9px;
  border-radius: 6px;
}

/* ============================================================
   TIMELINE (Experience)
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--border) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-dot {
  position: absolute;
  left: -35px; top: 8px;
  width: 14px; height: 14px;
  background: var(--accent);
  border: 2px solid var(--bg-alt);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(14,165,233,0.4);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition);
}

.timeline-content:hover { border-color: var(--border-hover); }

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.timeline-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.timeline-company {
  display: block;
  font-size: 0.875rem;
  color: var(--accent);
  margin-top: 4px;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
}

.timeline-content p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 16px;
}

.timeline-bullets li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding-left: 18px;
  position: relative;
}

.timeline-bullets li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
  top: 1px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.timeline-tags span {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--accent-glow);
  border: 1px solid rgba(14,165,233,0.2);
  color: var(--accent);
  padding: 3px 9px;
  border-radius: 6px;
}

.timeline-cta {
  padding: 24px;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
}

.timeline-cta p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

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

.project-icon { font-size: 2rem; line-height: 1; }

.project-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.project-badge, .project-status {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid;
}

.project-badge {
  background: var(--accent-glow);
  border-color: rgba(14,165,233,0.3);
  color: var(--accent);
}

.badge-open.source, .badge-open-source {
  background: rgba(16,185,129,0.1);
  border-color: rgba(16,185,129,0.3);
  color: var(--accent-3);
}

.badge-lab {
  background: rgba(124,58,237,0.1);
  border-color: rgba(124,58,237,0.3);
  color: #a78bfa;
}

.badge-diy {
  background: rgba(245,158,11,0.1);
  border-color: rgba(245,158,11,0.3);
  color: #fbbf24;
}

.badge-dev {
  background: rgba(16,185,129,0.1);
  border-color: rgba(16,185,129,0.3);
  color: var(--accent-3);
}

.project-status {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}

.status-production { color: var(--accent-3); border-color: rgba(16,185,129,0.3); }
.status-en-développement { color: var(--accent); border-color: rgba(14,165,233,0.3); }
.status-r\&d, .status-r-d { color: #f59e0b; border-color: rgba(245,158,11,0.3); }

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.project-card > p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.project-features {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.project-features li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}

.project-features li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
}

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

.project-tags span {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 8px;
  border-radius: 5px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 8px;
  padding: 8px 14px;
  background: var(--accent-glow);
  border: 1px solid rgba(14,165,233,0.2);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.project-link:hover {
  background: rgba(14,165,233,0.2);
  color: var(--accent);
}

/* ============================================================
   OPEN SOURCE
   ============================================================ */
.opensource-grid {
  display: grid;
  gap: 24px;
  margin-bottom: 48px;
}

.os-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: border-color var(--transition);
}

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

.os-card-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.os-icon {
  width: 52px; height: 52px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
}

.os-card-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.os-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

.os-card > p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.os-motivation {
  border-left: 3px solid var(--accent-2);
  padding-left: 16px;
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 20px;
}

.os-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.os-tags span {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 10px;
  border-radius: 6px;
}

.github-cta {
  text-align: center;
  padding: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.github-cta p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* ============================================================
   INTERESTS
   ============================================================ */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.interest-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color var(--transition), transform var(--transition);
  cursor: default;
}

.interest-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.interest-icon { font-size: 1.3rem; flex-shrink: 0; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.contact-item:hover { border-color: var(--border-hover); }

.contact-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }

.contact-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.contact-item a {
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 500;
  word-break: break-all;
}

.contact-item a:hover { color: var(--accent); }

.contact-card {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-alt) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}

.contact-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.contact-card > p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.contact-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.contact-tags span {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 100px;
}

/* ============================================================
   PLACEHOLDERS
   ============================================================ */
.placeholder-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  background: rgba(245,158,11,0.1);
  border: 1px dashed rgba(245,158,11,0.4);
  color: var(--placeholder);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.placeholder-inline {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--placeholder);
  opacity: 0.8;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
}

.footer-copy, .footer-tech {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  opacity: 0;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ============================================================
   ANIMATIONS (scroll reveal)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4,0,0.2,1), transform 0.6s cubic-bezier(0.4,0,0.2,1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { order: -1; grid-template-columns: repeat(2, 1fr); }
  .skills-highlight { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-card { position: static; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .hero-content { padding-top: 40px; padding-bottom: 60px; }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 99;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-burger { display: flex; }

  .expertise-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .interests-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }

  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .about-stats { grid-template-columns: 1fr; }
  .timeline-header { flex-direction: column; }
}

/* ============================================================
   EDUCATION
   ============================================================ */
.education-block {
  margin-top: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.education-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.education-title svg { color: var(--accent); }

.education-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.education-item:last-child { border-bottom: none; }

.education-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(14,165,233,0.2);
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
}

.education-item strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.education-item span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================================
   PRINT / PDF
   ============================================================ */
@media print {
  .nav, .hero-scroll-hint, .back-to-top, .hero-actions { display: none !important; }
  .hero { min-height: auto; padding-top: 0; }
  .section { padding: 40px 0; }
  * { animation: none !important; transition: none !important; }
}