/* =========================================================
   ahbk.tr — Portfolio Styles v2
   Precision-engineered dark theme for senior engineering
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
img  { display: block; max-width: 100%; }
a    { color: inherit; }

/* ── Variables ──────────────────────────────────────────── */
:root {
  --bg:         #08090e;
  --surface-1:  #0d1117;
  --surface-2:  #131a24;
  --border:     rgba(255, 255, 255, 0.06);
  --border-md:  rgba(255, 255, 255, 0.10);

  --accent:     #22d3ee;   /* cyan-400  */
  --accent-dim: rgba(34, 211, 238, 0.08);
  --accent-border: rgba(34, 211, 238, 0.2);

  --violet:     #a78bfa;   /* violet-400 */
  --green:      #34d399;
  --amber:      #fbbf24;

  --text-1:     #f1f5f9;
  --text-2:     #94a3b8;
  --text-3:     #4b5563;
}

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

/* ── Utility ────────────────────────────────────────────── */
.mono { font-family: 'JetBrains Mono', 'Fira Code', monospace; }

/* ── NAVIGATION ─────────────────────────────────────────── */
#nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: 60px;
  display: flex;
  align-items: center;
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}

#nav.scrolled {
  background: rgba(8, 9, 14, 0.90);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom-color: var(--border);
}

.nav-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-1);
  text-decoration: none;
}

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

.nav-links {
  display: none;
  list-style: none;
  gap: 36px;
}

@media (min-width: 768px) { .nav-links { display: flex; } }

.nav-links a {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-1); }

.lang-switcher { display: flex; gap: 6px; }

.lang-btn {
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-3);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 10px;
  cursor: pointer;
  transition: all 0.2s;
}
.lang-btn:hover  { color: var(--text-2); border-color: var(--border-md); }
.lang-btn.active { color: var(--accent); border-color: var(--accent-border); background: var(--accent-dim); }

/* ── HERO ───────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  padding-top: 60px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(ellipse 60% 50% at 70% 30%, rgba(34,211,238,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 10% 80%, rgba(167,139,250,0.04) 0%, transparent 70%),
    var(--bg);
  position: relative;
  overflow: hidden;
}

/* Subtle grid overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 80%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 28px;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
}

@media (min-width: 900px) {
  .hero-inner { grid-template-columns: 1fr 280px; gap: 64px; }
}

/* Status pill */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(52, 211, 153, 0.2);
  background: rgba(52, 211, 153, 0.06);
  border-radius: 999px;
  padding: 5px 14px 5px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 28px;
}

.status-dot {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: blink 2.5s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

/* Hero heading */
.hero-headline {
  font-size: clamp(2.75rem, 6.5vw, 5rem);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.04em;
  color: var(--text-1);
  margin-bottom: 24px;
}

.hero-headline em {
  font-style: normal;
  color: transparent;
  background: linear-gradient(110deg, var(--accent), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-sub {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-2);
  max-width: 500px;
  margin-bottom: 32px;
}

.hero-sub strong {
  color: var(--text-1);
  font-weight: 600;
}

/* Tech strip */
.tech-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 36px;
}

.tech-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  background: var(--surface-1);
  transition: color 0.2s, border-color 0.2s;
}
.tech-pill:hover { color: var(--text-2); border-color: var(--border-md); }

/* CTA row */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent);
  color: #08090e;
  font-size: 0.875rem;
  font-weight: 700;
  padding: 11px 22px;
  border-radius: 8px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent;
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 11px 22px;
  border-radius: 8px;
  text-decoration: none;
  border: 1px solid var(--border);
  transition: color 0.2s, border-color 0.2s, transform 0.15s;
}
.btn-ghost:hover { color: var(--text-1); border-color: var(--border-md); transform: translateY(-1px); }

/* Profile panel */
.profile-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.avatar-ring {
  width: 160px; height: 160px;
  border-radius: 18px;
  border: 1px solid var(--border-md);
  overflow: hidden;
  background: var(--surface-2);
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
}

.avatar-ring img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.avatar-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-placeholder svg { opacity: 0.2; }

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
}

.stat-tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
}

.stat-val {
  display: block;
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-1);
  line-height: 1;
  margin-bottom: 5px;
}

.stat-key {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}

/* ── SECTION LAYOUT ─────────────────────────────────────── */
.section {
  padding: 96px 0;
  border-top: 1px solid var(--border);
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

.section-label {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.625rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-1);
  margin-bottom: 12px;
}

.section-lead {
  font-size: 0.9375rem;
  color: var(--text-2);
  max-width: 540px;
  line-height: 1.75;
  margin-bottom: 56px;
}

/* ── DIFFERENTIATORS ────────────────────────────────────── */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 64px;
}

.diff-card {
  background: var(--surface-1);
  padding: 32px 28px;
  transition: background 0.2s;
}

.diff-card:hover { background: var(--surface-2); }

.diff-num {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-1);
  line-height: 1;
  margin-bottom: 8px;
  background: linear-gradient(110deg, var(--accent), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.diff-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
}

.diff-desc {
  font-size: 0.8125rem;
  color: var(--text-2);
  line-height: 1.65;
}

/* ── TIMELINE ───────────────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.tl-item {
  position: relative;
}

.tl-item::before {
  content: '';
  position: absolute;
  left: -29px;
  top: 5px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 2px solid var(--border-md);
  transition: border-color 0.2s, background 0.2s;
}

.tl-item:hover::before {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.tl-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.tl-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 6px;
}

.tl-desc {
  font-size: 0.8125rem;
  color: var(--text-2);
  line-height: 1.65;
}

/* ── SKILLS ─────────────────────────────────────────────── */
.skills-table {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.skill-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: start;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.skill-row:last-child { border-bottom: none; }
.skill-row:hover { background: var(--surface-1); }

.skill-cat {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  padding-top: 2px;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 11px;
}

/* ── LIVE ANNOUNCE ──────────────────────────────────────── */
.live-announce {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(52, 211, 153, 0.05);
  border: 1px solid rgba(52, 211, 153, 0.18);
  border-radius: 10px;
  padding: 13px 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--green);
  text-decoration: none;
  margin-bottom: 16px;
  transition: background 0.2s, border-color 0.2s;
}
.live-announce:hover { background: rgba(52, 211, 153, 0.1); border-color: rgba(52, 211, 153, 0.3); }
.live-dot-pulse {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  animation: blink 2.5s ease-in-out infinite;
}
.live-arrow {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.55;
  font-family: var(--mono, monospace);
}

/* ── PROJECTS ───────────────────────────────────────────── */
.featured-card {
  display: block;
  text-decoration: none;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px;
  margin-bottom: 20px;
  transition: border-color 0.25s, transform 0.2s;
  position: relative;
  overflow: hidden;
}

.featured-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-border), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.featured-card:hover { border-color: var(--accent-border); transform: translateY(-3px); }
.featured-card:hover::after { opacity: 1; }

.fc-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

@media (min-width: 800px) { .fc-body { flex-direction: row; align-items: flex-start; } }

.fc-main { flex: 1; }

.fc-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.badge {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 999px;
}

.badge-cyan  { background: rgba(34,211,238,0.1);  border: 1px solid rgba(34,211,238,0.2);  color: var(--accent); }
.badge-green { background: rgba(52,211,153,0.1);  border: 1px solid rgba(52,211,153,0.2);  color: var(--green); }
.badge-violet{ background: rgba(167,139,250,0.1); border: 1px solid rgba(167,139,250,0.2); color: var(--violet); }

.fc-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-1);
  margin-bottom: 14px;
  transition: color 0.2s;
  line-height: 1.2;
}

.featured-card:hover .fc-title { color: var(--accent); }

.fc-desc {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 22px;
}

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

.tag-mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 9px;
  background: var(--surface-2);
}

.fc-panel {
  flex-shrink: 0;
  width: 220px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.fc-panel-title {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 14px;
}

.fc-panel ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.fc-panel li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-2);
}

.check { color: var(--green); font-size: 0.7rem; }

.fc-link {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  transition: opacity 0.2s;
}

.featured-card:hover .fc-link { opacity: 0.8; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}

.project-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

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

.pc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.pc-desc {
  font-size: 0.8125rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 18px;
}

/* ── CONTACT ────────────────────────────────────────────── */
.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.contact-tile {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 24px;
  text-decoration: none;
  min-width: 220px;
  transition: border-color 0.2s, transform 0.2s;
}

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

.ct-icon {
  width: 38px; height: 38px;
  border-radius: 9px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--accent);
  font-weight: 800;
  font-size: 0.875rem;
}

.ct-label { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); margin-bottom: 3px; }
.ct-val   { font-size: 0.875rem;  font-weight: 600; color: var(--text-1); }

/* ── FOOTER ─────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-3);
}

@media (min-width: 640px) {
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}

/* ── Noticeboard page ───────────────────────────────────── */
.nb-hero {
  padding: 130px 0 80px;
  background:
    radial-gradient(ellipse 70% 40% at 50% 0%, rgba(34,211,238,0.06) 0%, transparent 70%),
    var(--bg);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--text-3);
  text-decoration: none;
  margin-bottom: 36px;
  transition: color 0.2s;
}

.back-link:hover { color: var(--text-2); }

.nb-modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 12px;
}

.nb-module-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 20px;
  transition: border-color 0.2s, transform 0.2s;
}

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

.nb-mod-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-3);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.nb-mod-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 6px;
}

.nb-mod-desc {
  font-size: 0.775rem;
  color: var(--text-2);
  line-height: 1.6;
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.arch-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 22px;
}

.arch-card h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.arch-card p {
  font-size: 0.8125rem;
  color: var(--text-2);
  line-height: 1.7;
}

.arch-card code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--violet);
  background: rgba(167,139,250,0.08);
  border-radius: 3px;
  padding: 1px 5px;
}

/* ── LCD Demo ───────────────────────────────────────────── */
#lcd-app {
  background: #050810;
  border: 1px solid rgba(34,211,238,0.12);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
}

.lcd-header {
  background: #0a1525;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lcd-school {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
}

.lcd-clock-display {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-1);
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

.lcd-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 18px;
  min-height: 280px;
}

@media (max-width: 640px) { .lcd-grid { grid-template-columns: 1fr; } }

.lcd-tile {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 10px;
  padding: 16px;
  transition: border-color 0.4s;
}

.lcd-tile.active { border-color: rgba(34,211,238,0.25); background: rgba(34,211,238,0.03); }

.lcd-tile-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(34,211,238,0.7);
  margin-bottom: 12px;
}

.lcd-tile-content { font-size: 0.8125rem; color: #7a8ca0; line-height: 1.65; }

.lcd-ticker-wrap {
  background: #0a1525;
  border-top: 1px solid rgba(255,255,255,0.04);
  padding: 10px 24px;
  overflow: hidden;
  white-space: nowrap;
}

.lcd-ticker-text {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--amber);
  font-weight: 500;
  animation: scroll-left 24s linear infinite;
}

@keyframes scroll-left {
  from { transform: translateX(100vw); }
  to   { transform: translateX(-100%); }
}

.demo-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
}

.demo-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-3);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.demo-btn:hover  { color: var(--text-2); border-color: var(--border-md); }
.demo-btn.active { color: var(--accent); border-color: var(--accent-border); background: var(--accent-dim); }

/* ── Scroll animations ──────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── Misc ───────────────────────────────────────────────── */
.current-year {}