/* ═══════════════════════════════════════
   DESIGN TOKENS — LIGHT (default)
═══════════════════════════════════════ */
:root, html.light-theme {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --surface-2: #f0f0f2;
  --border: rgba(0,0,0,0.09);
  --border-strong: rgba(0,0,0,0.16);
  --text: #101012;
  --muted: #5c5c64;
  --dim: #8b8b93;
  --accent: #0f9d68;
  --accent-2: #0ea5e9;
  --accent-ink: #ffffff;
  --accent-grad: linear-gradient(135deg, #0f9d68, #0ea5e9);
  --accent-glow: rgba(15,157,104,.22);

  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --radius-sm: 6px; --radius: 10px; --radius-lg: 16px;
  --space-1: 8px; --space-2: 16px; --space-3: 24px; --space-4: 40px; --space-5: 64px; --space-6: 96px;
  --container: 1120px;
}

/* ═══════════════════════════════════════
   DESIGN TOKENS — DARK (opt-in)
═══════════════════════════════════════ */
html.dark-theme {
  --bg: #0a0a0b;
  --surface: #131316;
  --surface-2: #1a1a1e;
  --border: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);
  --text: #f5f5f7;
  --muted: #96969e;
  --dim: #5c5c64;
  --accent: #34d399;
  --accent-2: #22d3ee;
  --accent-ink: #06120d;
  --accent-grad: linear-gradient(135deg, #34d399, #22d3ee);
  --accent-glow: rgba(52,211,153,.22);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg); color: var(--text); font-family: var(--body);
  line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }
::selection { background: var(--accent); color: var(--accent-ink); }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 8px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 10000;
  background: var(--accent); color: var(--accent-ink);
  padding: 12px 20px; font-weight: 600; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ═══════════════════════════════════════
   SPLASH LANDING
═══════════════════════════════════════ */
#splash {
  position: fixed; inset: 0; z-index: 5000;
  background:
    radial-gradient(circle at 18% 22%, var(--accent-glow), transparent 46%),
    radial-gradient(circle at 84% 78%, rgba(14,165,233,.20), transparent 46%),
    linear-gradient(var(--border) 1px, transparent 1px) 0 0/44px 44px,
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0/44px 44px,
    var(--bg);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  transition: opacity .6s var(--ease), visibility .6s var(--ease);
}
#splash.hide { opacity: 0; visibility: hidden; pointer-events: none; }

/* faint scanning sweep for a "tech" feel */
#splash .splash-scan {
  position: absolute; inset: -10% 0 auto 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .5; filter: blur(1px);
  animation: scanSweep 6s ease-in-out infinite;
}
@keyframes scanSweep {
  0% { top: -5%; opacity: 0; }
  10% { opacity: .5; }
  50% { top: 50%; opacity: .5; }
  90% { opacity: .5; }
  100% { top: 105%; opacity: 0; }
}

/* ambient floating blobs */
#splash::before, #splash::after {
  content: ''; position: absolute; border-radius: 50%;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  opacity: .18; filter: blur(60px); pointer-events: none;
}
#splash::before { width: 480px; height: 480px; top: -140px; left: -120px; animation: blobFloat1 14s ease-in-out infinite; }
#splash::after {
  width: 380px; height: 380px; bottom: -120px; right: -100px; animation: blobFloat2 16s ease-in-out infinite;
  background: radial-gradient(circle, var(--accent-2), transparent 70%);
}
@keyframes blobFloat1 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.15); }
}
@keyframes blobFloat2 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-50px, -30px) scale(1.1); }
}

.splash-inner { position: relative; text-align: center; padding: 24px; max-width: 560px; }
.splash-logo {
  width: 220px; height: auto; margin: 0 auto 26px;
  border-radius: 20px;
  opacity: 0; transform: translateY(-14px) scale(.9);
  animation: splashIn .7s var(--ease) .1s forwards;
}
.splash-title {
  font-size: clamp(2rem, 5.6vw, 2.9rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 14px;
  opacity: 0; transform: translateY(16px);
  animation: splashIn .7s var(--ease) .28s forwards;
}
.splash-title span { color: var(--accent); }
.splash-tag {
  font-size: 1rem; color: var(--muted); margin-bottom: 36px;
  font-family: var(--mono); letter-spacing: .01em;
  opacity: 0; transform: translateY(16px);
  animation: splashIn .7s var(--ease) .44s forwards;
}

.splash-btn {
  font-size: .95rem; padding: 14px 32px;
  opacity: 0; transform: translateY(16px) scale(.96);
  animation: splashIn .7s var(--ease) .6s forwards;
}
.splash-btn:hover { box-shadow: 0 8px 30px -8px var(--accent); }

@keyframes splashIn { to { opacity: 1; transform: translateY(0) scale(1); } }

@media (prefers-reduced-motion: reduce) {
  #splash::before, #splash::after { animation: none; }
  #splash .splash-scan { display: none; }
  .splash-logo, .splash-title, .splash-tag, .splash-btn { animation: none; opacity: 1; transform: none; }
}

/* live clock + visit counter — fixed top-left corner of splash */
.splash-meta-fixed {
  position: absolute; top: 22px; left: 26px; z-index: 2;
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  opacity: 0; animation: splashIn .7s var(--ease) .3s forwards;
}
.splash-meta-item {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: .78rem; color: var(--muted);
  background: var(--surface); border: 1px solid var(--border);
  padding: 7px 14px; border-radius: 999px;
}
.splash-meta-item i { color: var(--accent); }
.splash-meta-item span { color: var(--text); font-weight: 600; }

/* quick contact — fixed top-right corner of splash */
.splash-contact-fixed {
  position: absolute; top: 22px; right: 26px; z-index: 2;
  display: flex; align-items: center; gap: 8px;
}
.splash-contact-fixed a {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--muted); display: flex; align-items: center; justify-content: center;
  font-size: .92rem; transition: border-color .2s, color .2s, transform .2s;
}
.splash-contact-fixed a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

@media (max-width: 640px) {
  .splash-meta-fixed { top: 14px; left: 14px; gap: 6px; }
  .splash-meta-item { font-size: .68rem; padding: 6px 10px; }
  .splash-contact-fixed { top: 14px; right: 14px; }
  .splash-contact-fixed a { width: 34px; height: 34px; font-size: .84rem; }
  .splash-logo { width: 160px; }
}

#home { opacity: 0; }
#home.show { opacity: 1; transition: opacity .5s var(--ease) .1s; }

/* ═══════════════════════════════════════
   TOP BAR
═══════════════════════════════════════ */
#topbar {
  position: sticky; top: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 48px;
  background: rgba(10,10,11,.7);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
html.light-theme #topbar { background: rgba(247,247,248,.8); }

.brand { display: flex; align-items: center; gap: 11px; }
.brand-icon { height: 42px; width: auto; border-radius: 8px; }
.brand-text { font-size: 1.08rem; font-weight: 700; letter-spacing: -0.01em; }

.topbar-actions { display: flex; align-items: center; gap: 14px; }

.topbar-social { display: flex; align-items: center; gap: 6px; padding-right: 10px; border-right: 1px solid var(--border); }
.topbar-social a {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--muted); display: flex; align-items: center; justify-content: center;
  font-size: .86rem; transition: border-color .2s, color .2s, transform .2s;
}
.topbar-social a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

#themeToggle {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: border-color .2s;
}
#themeToggle:hover { border-color: var(--accent); color: var(--accent); }

.nav-cta {
  display: inline-flex; align-items: center; font-size: .85rem; font-weight: 600;
  color: var(--accent-ink); background: var(--accent); padding: 9px 20px; border-radius: 999px;
  transition: opacity .2s, transform .2s;
}
.nav-cta:hover { opacity: .88; transform: translateY(-1px); }

.hbg { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; z-index: 1001; }
.hbg span { width: 22px; height: 2px; background: var(--text); display: block; transition: all .25s; border-radius: 1px; }
.hbg.on span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hbg.on span:nth-child(2) { opacity: 0; }
.hbg.on span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.mob-nav {
  display: none; position: fixed; inset: 0; background: rgba(10,10,11,.98);
  backdrop-filter: blur(20px); z-index: 999;
}
html.light-theme .mob-nav { background: rgba(247,247,248,.98); }
.mob-nav.on { display: flex; align-items: center; justify-content: center; }
.mob-inner { display: flex; flex-direction: column; align-items: center; gap: 26px; }
.mob-ftab { background: none; border: none; font-size: 1.4rem; font-weight: 600; color: var(--text); cursor: pointer; }
.mob-ftab:hover, .mob-ftab.active { color: var(--accent); }
.mob-resume { color: var(--accent) !important; font-size: 1.2rem; font-weight: 600; }
.mob-socials { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
.mob-socials a {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--muted); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: border-color .2s, color .2s;
}
.mob-socials a:hover { border-color: var(--accent); color: var(--accent); }

/* ═══════════════════════════════════════
   FILTER BAR
═══════════════════════════════════════ */
#filterbar {
  position: sticky; top: 75px; z-index: 900;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 48px;
}
.filterbar-scroll {
  display: flex; gap: 8px; overflow-x: auto; padding: 14px 0;
  scrollbar-width: none;
}
.filterbar-scroll::-webkit-scrollbar { display: none; }
.ftab {
  flex-shrink: 0; font-size: .85rem; font-weight: 500;
  padding: 8px 18px; background: transparent; border: 1px solid var(--border);
  color: var(--muted); border-radius: 999px; cursor: pointer; transition: all .2s;
  white-space: nowrap;
}
.ftab:hover { border-color: var(--border-strong); color: var(--text); }
.ftab.active { background: var(--accent-grad); border-color: transparent; color: var(--accent-ink); }

/* ═══════════════════════════════════════
   TAB SECTIONS
═══════════════════════════════════════ */
.tab-section { display: none; padding: var(--space-5) 48px; position: relative; }
.tab-section.active { display: block; }

/* ambient color wash behind the About tab */
#about::before {
  content: ''; position: absolute; top: -40px; left: 50%; transform: translateX(-50%);
  width: min(900px, 90%); height: 420px;
  background: radial-gradient(ellipse at top, var(--accent-glow), transparent 70%);
  pointer-events: none; z-index: 0; opacity: .8;
}
#about > .si { position: relative; z-index: 1; }

.tab-section.active > .si > * {
  opacity: 0; transform: translateY(14px);
  animation: fadeIn .55s var(--ease) forwards;
}
.tab-section.active > .si > *:nth-child(1) { animation-delay: .02s; }
.tab-section.active > .si > *:nth-child(2) { animation-delay: .08s; }
.tab-section.active > .si > *:nth-child(3) { animation-delay: .14s; }
.tab-section.active > .si > *:nth-child(4) { animation-delay: .2s; }
.tab-section.active > .si > *:nth-child(5) { animation-delay: .26s; }
.tab-section.active > .si > *:nth-child(6) { animation-delay: .32s; }
.tab-section.active > .si > *:nth-child(n+7) { animation-delay: .36s; }

@keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
  .tab-section.active > .si > * { animation: none; opacity: 1; transform: none; }
}

.si { max-width: var(--container); margin: 0 auto; position: relative; }
.eyebrow {
  display: inline-block;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .04em;
  color: var(--accent-ink); text-transform: uppercase; margin-bottom: 14px;
  background: var(--accent-grad);
  padding: 5px 13px; border-radius: 999px;
}
.sec-title { font-size: clamp(1.9rem, 3.2vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 14px; line-height: 1.15; }
.sec-subtitle { font-size: 1rem; color: var(--muted); max-width: 560px; line-height: 1.7; margin-bottom: var(--space-4); }
.sub-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 14px; }
.body-text { font-size: .98rem; color: var(--muted); line-height: 1.8; max-width: 620px; }
.about-block { margin-top: 32px; }
.bullet-list li { font-size: .94rem; color: var(--muted); line-height: 1.9; padding-left: 18px; position: relative; }
.bullet-list li::before { content: ''; position: absolute; left: 0; top: 12px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ── About / Hero ── */
.about-hero-wrap {
  display: grid; grid-template-columns: 1.35fr 1fr; gap: var(--space-4);
  align-items: center; margin-bottom: var(--space-4);
}
.hero-name { font-size: clamp(2.2rem, 4.6vw, 3.4rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 14px; }
.hero-role { font-size: 1.05rem; color: var(--muted); font-weight: 500; margin-bottom: 18px; }
.hero-desc { font-size: 1.02rem; color: var(--muted); max-width: 560px; line-height: 1.75; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }

/* ── About photo (right column) ── */
.about-hero-photo { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.hero-photo-box {
  position: relative; width: 100%; max-width: 340px; aspect-ratio: 4/5;
  border-radius: var(--radius-lg); overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: 0 20px 44px -20px var(--accent-glow);
}
.hero-photo-box::before {
  content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,.28) 100%);
}
.hero-photo-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-photo-fallback {
  display: none; position: absolute; inset: 0; align-items: center; justify-content: center;
  font-size: 3.4rem; color: var(--dim); background: var(--surface-2);
}
.hero-photo-box.img-fallback .hero-photo-img { display: none; }
.hero-photo-box.img-fallback .hero-photo-fallback { display: flex; }
.hero-photo-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: .74rem; color: var(--muted);
  background: var(--surface); border: 1px solid var(--border);
  padding: 8px 16px; border-radius: 999px;
}
.hero-photo-tag i { color: var(--accent); }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 26px; border-radius: 999px;
  background: var(--accent-grad); color: var(--accent-ink); font-size: .92rem; font-weight: 600;
  transition: opacity .2s, transform .2s, box-shadow .2s; border: none; cursor: pointer;
  box-shadow: 0 6px 20px -6px var(--accent-glow);
}
.btn-primary:hover { opacity: .92; transform: translateY(-1px); box-shadow: 0 10px 28px -6px var(--accent-glow); }

.btn-outline {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 25px; border-radius: 999px;
  background: transparent; color: var(--text); border: 1px solid var(--border-strong);
  font-size: .92rem; font-weight: 600; transition: border-color .2s, background .2s, transform .2s;
}
.btn-outline:hover { border-color: var(--accent); background: rgba(52,211,153,.08); transform: translateY(-1px); }

.hero-links { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 0; }
.hero-links a { display: inline-flex; align-items: center; gap: 7px; font-size: .88rem; color: var(--muted); font-weight: 500; transition: color .2s; }
.hero-links a:hover { color: var(--text); }
.hero-links .dot { color: var(--dim); }

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li {
  font-size: .8rem; color: var(--muted); background: var(--surface-2); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; transition: color .2s, border-color .2s;
}
.tag-list li:hover { color: var(--text); border-color: var(--border-strong); }

.quick-grid {
  margin-top: 40px; display: grid; grid-template-columns: repeat(5, 1fr);
  gap: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--border);
}
.stat { text-align: left; }
.sn {
  display: block; font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em;
  background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sl { display: block; font-size: .78rem; color: var(--muted); margin-top: 2px; }

/* ── Academics ── */
.academics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--space-2); }
.acad-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: border-color .25s, box-shadow .25s, transform .25s; }
.acad-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 12px 28px -14px var(--accent-glow); }
.acad-top { display: flex; justify-content: space-between; align-items: start; gap: 12px; margin-bottom: 8px; }
.acad-top h3 { font-size: 1.02rem; font-weight: 700; }
.acad-year { font-family: var(--mono); font-size: .72rem; color: var(--muted); white-space: nowrap; }
.acad-org { font-size: .86rem; color: var(--muted); margin-bottom: 18px; }
.acad-score { display: flex; align-items: baseline; gap: 8px; }
.acad-score-num {
  font-size: 1.7rem; font-weight: 800;
  background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.acad-score-label { font-size: .78rem; color: var(--muted); }

/* ── Skills ── */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: var(--space-2); }
.skill-group { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.skill-group h3 { font-size: .92rem; font-weight: 600; margin-bottom: 16px; display: flex; align-items: center; gap: 9px; }
.skill-group h3 i { color: var(--accent); font-size: .85rem; }
.learning-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-2); }
.learn-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.learn-item h4 { font-size: .88rem; font-weight: 700; margin-bottom: 6px; }
.learn-item p { font-size: .8rem; color: var(--muted); line-height: 1.6; }

/* ── Projects ── */
.proj-tabs { display: flex; gap: 8px; margin-bottom: var(--space-4); flex-wrap: wrap; }
.ptab {
  font-size: .85rem; font-weight: 500; padding: 8px 18px; background: transparent;
  border: 1px solid var(--border); color: var(--muted); border-radius: 999px; cursor: pointer; transition: all .2s;
}
.ptab:hover { border-color: var(--border-strong); color: var(--text); }
.ptab.active { background: var(--surface-2); border-color: var(--border-strong); color: var(--text); }

.proj-featured {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-4); align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: var(--space-4); margin-bottom: var(--space-2);
  position: relative; overflow: hidden;
}
.proj-featured::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent-grad);
}
.pf-body h3 { font-size: 1.4rem; font-weight: 700; margin: 12px 0; letter-spacing: -0.01em; }
.pf-body p { font-size: .96rem; color: var(--muted); line-height: 1.7; margin-bottom: 20px; max-width: 460px; }
.pf-note { font-size: .82rem !important; color: var(--dim) !important; margin-top: -10px !important; margin-bottom: 20px !important; }
.pf-visual {
  aspect-ratio: 4/3; border-radius: var(--radius); background: var(--surface-2); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 3rem; color: var(--dim);
}

.proj-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-2); margin-top: var(--space-2); margin-bottom: var(--space-4); }
.proj-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; transition: border-color .25s, transform .25s; }
.proj-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 14px 32px -14px var(--accent-glow); }
.proj-card.hidden { display: none; }

.pc-cat-tag {
  display: inline-flex; width: fit-content; font-family: var(--mono); font-size: .68rem; letter-spacing: .02em;
  padding: 4px 10px; border-radius: 999px; margin-bottom: 14px; background: var(--surface-2); border: 1px solid var(--border); color: var(--muted);
}
.pc-cat-tag.iot { color: #f0a875; }
.pc-cat-tag.ai { color: #a6a0f5; }
.pc-title { font-size: 1.02rem; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.005em; }
.pc-desc { font-size: .88rem; color: var(--muted); line-height: 1.7; margin-bottom: 18px; flex: 1; }
.pc-tech { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.pc-tech li { font-family: var(--mono); font-size: .68rem; color: var(--dim); background: var(--bg); padding: 3px 9px; border-radius: 4px; border: 1px solid var(--border); }
.pc-links { margin-top: auto; }
.pc-btn { display: inline-flex; align-items: center; gap: 8px; font-size: .84rem; font-weight: 600; color: var(--text); border: 1px solid var(--border-strong); padding: 9px 16px; border-radius: var(--radius-sm); transition: border-color .2s, background .2s; }
.pc-btn:hover { border-color: var(--accent); background: rgba(52,211,153,.08); }
.pc-link-na { display: inline-flex; align-items: center; gap: 8px; font-size: .84rem; color: var(--dim); border: 1px dashed var(--border); padding: 9px 16px; border-radius: var(--radius-sm); }
.proj-more { text-align: center; }

/* ── Experience ── */
.exp-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 26px; margin-bottom: 14px; }
.exp-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.exp-top h3 { font-size: 1rem; font-weight: 700; }
.exp-tag { font-family: var(--mono); font-size: .7rem; color: var(--accent); background: var(--surface-2); border: 1px solid var(--border); padding: 4px 10px; border-radius: 999px; white-space: nowrap; }
.exp-card p { font-size: .9rem; color: var(--muted); line-height: 1.7; }

/* ── Certifications ── */
.cert-list { border-top: 1px solid var(--border); }
.cert-item { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); padding: 20px 4px; border-bottom: 1px solid var(--border); transition: background .2s; }
.cert-item:hover { background: var(--surface); }
.cert-main h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.cert-main p { font-size: .86rem; color: var(--muted); }
.cert-link { display: inline-flex; align-items: center; gap: 7px; font-size: .84rem; font-weight: 600; color: var(--muted); white-space: nowrap; transition: color .2s; }
.cert-item:hover .cert-link { color: var(--accent); }

.gh-container { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-4); text-align: center; }
.gh-chart { margin-bottom: 20px; overflow-x: auto; }
.gh-chart img { max-width: 100%; border-radius: 4px; margin: 0 auto; }
.gh-cards { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 26px; }
.gh-card { border-radius: var(--radius-sm); overflow: hidden; }
.gh-card img { height: 150px; width: auto; display: block; }

/* ── Contact ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.contact-items { display: flex; flex-direction: column; gap: 10px; }
.citem { display: flex; align-items: center; gap: 14px; background: var(--surface); border: 1px solid var(--border); padding: 15px 18px; border-radius: var(--radius); transition: border-color .2s, transform .2s; }
.citem:hover { border-color: var(--border-strong); transform: translateX(4px); }
.ci-icon { width: 38px; height: 38px; flex-shrink: 0; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: .85rem; }
.ci-label { font-size: .72rem; color: var(--dim); margin-bottom: 2px; }
.ci-value { color: var(--text); font-size: .88rem; font-weight: 500; }

.form-card { background: var(--surface); border: 1px solid var(--border); padding: 28px; border-radius: var(--radius-lg); }
.form-header { font-size: 1rem; font-weight: 700; margin-bottom: 22px; }
.fg { display: flex; flex-direction: column; gap: 6px; margin-bottom: 15px; }
.fg label { font-size: .78rem; color: var(--muted); font-weight: 500; }
.fg input, .fg textarea {
  background: var(--bg); border: 1px solid var(--border); color: var(--text); padding: 11px 14px;
  font-family: var(--body); font-size: .9rem; border-radius: var(--radius-sm); outline: none; transition: border-color .2s; resize: vertical;
}
.fg input:focus, .fg textarea:focus { border-color: var(--accent); }
.fg textarea { min-height: 100px; }
.btn-send { width: 100%; margin-top: 6px; background: var(--accent); border: none; color: var(--accent-ink); padding: 13px 24px; font-size: .9rem; font-weight: 600; cursor: pointer; border-radius: var(--radius-sm); transition: opacity .2s; }
.btn-send:hover { opacity: .88; }
.form-success { display: none; margin-top: 12px; padding: 12px; border-radius: var(--radius-sm); background: rgba(52,211,153,.1); border: 1px solid rgba(52,211,153,.3); color: var(--accent); font-size: .84rem; text-align: center; }

/* ── Footer ── */
footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 48px; }
.ft-inner { max-width: var(--container); margin: 0 auto; }
.ft-top { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; margin-bottom: 24px; }
.ft-name { font-size: 1.05rem; font-weight: 700; display: block; margin-bottom: 3px; }
.ft-tagline { font-size: .82rem; color: var(--muted); }
.ft-socials { display: flex; gap: 8px; flex-wrap: wrap; }
.ft-socials a { width: 38px; height: 38px; background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); display: flex; align-items: center; justify-content: center; font-size: .88rem; border-radius: var(--radius-sm); transition: all .2s; }
.ft-socials a:hover { color: var(--accent); border-color: var(--accent); }
.ft-divider { height: 1px; background: var(--border); margin-bottom: 20px; }
.ft-bottom p { font-size: .82rem; color: var(--dim); }

/* Back to top */
#btt {
  position: fixed; bottom: 28px; right: 28px; z-index: 500; width: 44px; height: 44px;
  background: var(--surface); border: 1px solid var(--border); color: var(--text); font-size: .9rem;
  display: flex; align-items: center; justify-content: center; cursor: pointer; border-radius: 50%;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), border-color .2s;
}
#btt.on { opacity: 1; pointer-events: auto; transform: translateY(0); }
#btt:hover { border-color: var(--accent); color: var(--accent); }

/* ═══════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 1024px) {
  #topbar { padding: 14px 32px; }
  #filterbar { padding: 0 32px; }
  .tab-section { padding: var(--space-4) 32px; }
}
@media (max-width: 900px) {
  .nav-cta { display: none; }
  .topbar-social { display: none; }
  .hbg { display: flex; }
  #filterbar { display: none; }
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .proj-featured { grid-template-columns: 1fr; }
  .pf-visual { order: -1; aspect-ratio: 16/9; }
  .about-hero-wrap { grid-template-columns: 1fr; }
  .about-hero-photo { order: -1; }
  .hero-photo-box { max-width: 260px; }
}
@media (max-width: 640px) {
  #topbar { padding: 12px 20px; }
  .tab-section { padding: var(--space-4) 20px; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-3) var(--space-2); }
  .sn { font-size: 1.6rem; }
  .proj-grid { grid-template-columns: 1fr; }
  .cert-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  .ft-top { flex-direction: column; align-items: flex-start; }
  footer { padding: 32px 20px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}