/* ============================================================
   TOKENS - dark (default): a terminal screen.
   Light: a cool blueprint / security-report paper.
   ============================================================ */
:root {
  --bg:            #080b11;
  --bg-grid:       rgba(67, 224, 196, 0.05);
  --surface:       #0f1620;
  --surface-2:     #131c28;
  --surface-line:  #1f2b3a;
  --line:          #223042;
  --ink:           #e7eef6;
  --ink-soft:      #9fb0c3;
  --ink-faint:     #64788e;
  --accent:        #43e0c4;
  --accent-dim:    #2aa892;
  --accent-glow:   rgba(67, 224, 196, 0.16);
  --amber:         #f5b451;
  --danger:        #ff6b6b;
  --sel:           rgba(67, 224, 196, 0.28);
  --shadow:        0 18px 50px -24px rgba(0,0,0,0.85);
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1080px;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg:            #eef2f5;
    --bg-grid:       rgba(20, 70, 90, 0.05);
    --surface:       #ffffff;
    --surface-2:     #f4f7f9;
    --surface-line:  #dbe3e9;
    --line:          #d3dde4;
    --ink:           #142430;
    --ink-soft:      #445565;
    --ink-faint:     #748898;
    --accent:        #0c8f78;
    --accent-dim:    #0a7563;
    --accent-glow:   rgba(12, 143, 120, 0.12);
    --amber:         #b9781a;
    --danger:        #c23b3b;
    --sel:           rgba(12, 143, 120, 0.18);
    --shadow:        0 16px 40px -24px rgba(20,40,55,0.30);
  }
}
:root[data-theme="dark"] {
  --bg:#080b11; --bg-grid:rgba(67,224,196,0.05); --surface:#0f1620; --surface-2:#131c28;
  --surface-line:#1f2b3a; --line:#223042; --ink:#e7eef6; --ink-soft:#9fb0c3; --ink-faint:#64788e;
  --accent:#43e0c4; --accent-dim:#2aa892; --accent-glow:rgba(67,224,196,0.16); --amber:#f5b451;
  --danger:#ff6b6b; --sel:rgba(67,224,196,0.28); --shadow:0 18px 50px -24px rgba(0,0,0,0.85);
}
:root[data-theme="light"] {
  --bg:#eef2f5; --bg-grid:rgba(20,70,90,0.05); --surface:#ffffff; --surface-2:#f4f7f9;
  --surface-line:#dbe3e9; --line:#d3dde4; --ink:#142430; --ink-soft:#445565; --ink-faint:#748898;
  --accent:#0c8f78; --accent-dim:#0a7563; --accent-glow:rgba(12,143,120,0.12); --amber:#b9781a;
  --danger:#c23b3b; --sel:rgba(12,143,120,0.18); --shadow:0 16px 40px -24px rgba(20,40,55,0.30);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background .35s ease, color .35s ease;
}
::selection { background: var(--sel); color: var(--ink); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

#bg-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.grid-overlay {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
}
#cursor-glow {
  position: fixed; z-index: 0; pointer-events: none;
  width: 520px; height: 520px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  transform: translate(-50%, -50%);
  opacity: 0; transition: opacity .5s ease;
}
.wrap { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- scroll progress ---------- */
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  z-index: 60; box-shadow: 0 0 10px var(--accent-glow);
}

/* ---------- eyebrow / labels ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 8px;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--accent); opacity: 0.6; }

/* ============================================================ NAV */
header.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { font-family: var(--mono); font-weight: 700; font-size: 0.92rem; letter-spacing: 0.02em; display:flex; align-items:center; gap:10px; white-space: nowrap; }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1);} 50%{opacity:.45;transform:scale(.8);} }
@media (prefers-reduced-motion: reduce){ .brand .dot{ animation:none; } }
.brand .muted { color: var(--ink-faint); }
.nav-links { display: flex; gap: 4px; align-items: center; font-family: var(--mono); font-size: 0.8rem; }
.nav-links a {
  color: var(--ink-soft); padding: 7px 12px; border-radius: 7px;
  transition: color .18s, background .18s; position: relative;
}
.nav-links a:hover { color: var(--ink); background: var(--surface-2); }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 1px; background: var(--accent);
}
.nav-right { display: flex; align-items: center; gap: 8px; }
.theme-btn, .nav-burger {
  font-family: var(--mono); font-size: 0.75rem; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 11px; cursor: pointer; display: inline-flex; align-items: center; gap: 7px;
  transition: border-color .18s, color .18s;
}
.theme-btn:hover, .nav-burger:hover { color: var(--ink); border-color: var(--accent-dim); }
.nav-burger { display: none; font-size: 1rem; line-height: 1; padding: 6px 10px; }
@media (max-width: 800px) {
  .nav-links {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    padding: 10px 16px 14px;
  }
  .nav-links a { padding: 12px 14px; font-size: 0.9rem; }
  .nav-links a.active::after { display: none; }
  .nav-links.open { display: flex; animation: slideDown .22s ease both; }
  @keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
  @media (prefers-reduced-motion: reduce){ .nav-links.open { animation: none; } }
  .nav-burger { display: inline-flex; }
}

/* ============================================================ HERO */
.hero { padding: clamp(40px, 8vw, 76px) 0 40px; }
.term {
  border: 1px solid var(--surface-line); border-radius: 14px; overflow: hidden;
  background: var(--surface); box-shadow: var(--shadow);
}
.term-bar {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px;
  border-bottom: 1px solid var(--surface-line); background: var(--surface-2);
}
.term-bar .tb { width: 12px; height: 12px; border-radius: 50%; background: var(--line); flex: none; }
.term-bar .tb.r { background: #ff5f57; } .term-bar .tb.y { background: #febc2e; } .term-bar .tb.g { background: #28c840; }
.term-bar .path { margin-left: 10px; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.term-bar .hint { margin-left: auto; font-family: var(--mono); font-size: 0.68rem; color: var(--ink-faint); border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; white-space: nowrap; }
.term-body {
  padding: 22px 20px 24px; font-family: var(--mono);
  font-size: clamp(0.72rem, 2.4vw, 0.9rem);
  min-height: 240px; cursor: text;
}
.term-body .line { margin: 0 0 6px; color: var(--ink-soft); white-space: pre-wrap; word-break: break-word; }
.term-body .prompt { color: var(--accent); }
.term-body .flag { color: var(--amber); }
.term-body .err { color: var(--danger); }
.term-body .ok { color: var(--accent); }
.term-out { color: var(--ink); }
.term-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.term-input-line { display: flex; align-items: baseline; gap: 8px; }
.term-input-line .ps1 { color: var(--accent); flex: none; }
#term-input {
  flex: 1; min-width: 40px; background: transparent; border: 0; outline: none;
  color: var(--ink); font: inherit; caret-color: var(--accent); padding: 0;
}

.hero-id { margin-top: 30px; }
.hero-id h1 {
  font-size: clamp(2.4rem, 9vw, 5rem); line-height: 1.02; margin: 0;
  letter-spacing: -0.03em; font-weight: 800; text-wrap: balance;
}
.hero-id h1 .accent { color: var(--accent); }
.glitch { position: relative; display: inline-block; }
@media (hover:hover) and (prefers-reduced-motion: no-preference) {
  .glitch:hover { animation: glitch .34s steps(2) 2; }
  @keyframes glitch {
    0% { text-shadow: 2px 0 var(--accent), -2px 0 var(--danger); transform: translateX(0); }
    25% { text-shadow: -3px 0 var(--accent), 3px 0 var(--danger); transform: translateX(1px); }
    50% { text-shadow: 2px 0 var(--danger), -2px 0 var(--accent); transform: translateX(-1px); }
    100% { text-shadow: none; transform: none; }
  }
}
.hero-role {
  font-family: var(--mono); font-size: clamp(0.9rem, 3vw, 1.15rem);
  color: var(--ink-soft); letter-spacing: 0.01em; margin-top: 8px; min-height: 1.6em;
}
.hero-role .cursor { display:inline-block; width:9px; height:1.1em; background:var(--accent); vertical-align:-2px; margin-left:2px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce){ .hero-role .cursor{ animation:none; } }
.hero-blurb { max-width: 60ch; color: var(--ink-soft); margin: 18px 0 0; font-size: 1.02rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn {
  font-family: var(--mono); font-size: 0.85rem; padding: 12px 18px; border-radius: 9px;
  border: 1px solid var(--line); cursor: pointer;
  transition: box-shadow .18s, border-color .18s, color .18s, transform .12s ease-out;
  display: inline-flex; align-items: center; gap: 9px; will-change: transform;
}
.btn.primary { background: var(--accent); color: #04120f; border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { box-shadow: 0 0 0 4px var(--accent-glow), 0 8px 24px -8px var(--accent-glow); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { border-color: var(--accent-dim); color: var(--accent); }

.stat-row { display: flex; flex-wrap: wrap; gap: 24px 36px; margin-top: 40px; padding-top: 26px; border-top: 1px dashed var(--line); }
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .n { font-family: var(--mono); font-size: 1.6rem; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat .l { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-faint); }

/* ============================================================ SECTIONS */
section.block { padding: clamp(48px, 9vw, 72px) 0; }
.sec-head { margin-bottom: clamp(26px, 5vw, 40px); }
.sec-head h2 {
  font-size: clamp(1.6rem, 5vw, 2.5rem); margin: 12px 0 0; letter-spacing: -0.02em;
  font-weight: 800; text-wrap: balance;
}
.sec-head p { color: var(--ink-soft); max-width: 62ch; margin: 12px 0 0; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: start; }
@media (max-width: 820px){ .about-grid { grid-template-columns: 1fr; gap: 28px; } }
.about-grid p { color: var(--ink-soft); margin: 0 0 16px; }
.about-grid p strong { color: var(--ink); font-weight: 600; }
.id-card {
  border: 1px solid var(--surface-line); border-radius: 12px; background: var(--surface);
  padding: 4px; box-shadow: var(--shadow);
}
.id-card .id-head { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); padding: 14px 16px 10px; border-bottom: 1px solid var(--surface-line); }
.id-rows { padding: 6px 4px; }
.id-row { display: flex; justify-content: space-between; gap: 16px; padding: 11px 14px; font-family: var(--mono); font-size: 0.82rem; border-bottom: 1px solid var(--surface-2); }
.id-row:last-child { border-bottom: 0; }
.id-row .k { color: var(--ink-faint); }
.id-row .v { color: var(--ink); text-align: right; }
.id-row .v .live { color: var(--accent); }

/* ---------- Capabilities ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 760px){ .cap-grid { grid-template-columns: 1fr; } }
.cap {
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface);
  padding: 22px; transition: border-color .2s, transform .2s, box-shadow .2s;
}
.cap:hover { border-color: var(--accent-dim); transform: translateY(-3px); box-shadow: var(--shadow); }
.cap h3 { margin: 0 0 4px; font-size: 1.02rem; display: flex; align-items: center; gap: 10px; }
.cap h3 .idx { font-family: var(--mono); font-size: 0.72rem; color: var(--accent); }
.cap .desc { color: var(--ink-faint); font-size: 0.85rem; margin: 0 0 16px; font-family: var(--mono); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono); font-size: 0.76rem; padding: 5px 10px; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-soft);
  transition: border-color .18s, color .18s, transform .18s;
}
.chip:hover { border-color: var(--accent-dim); color: var(--ink); transform: translateY(-1px); }
.chip.hi { color: var(--accent); border-color: var(--accent-dim); }

/* ---------- Projects ---------- */
.proj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; perspective: 1200px; }
@media (max-width: 820px){ .proj-grid { grid-template-columns: 1fr; } }
.proj {
  border: 1px solid var(--surface-line); border-radius: 13px; background: var(--surface);
  overflow: hidden; display: flex; flex-direction: column;
  transition: border-color .2s, box-shadow .2s, transform .15s ease-out;
  position: relative; will-change: transform; transform-style: preserve-3d;
}
.proj::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), var(--accent-glow), transparent 45%);
  transition: opacity .25s;
}
.proj:hover { border-color: var(--accent-dim); box-shadow: var(--shadow); }
.proj:hover::after { opacity: 1; }
.proj-top { padding: 20px 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.proj-tag { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; padding: 4px 9px; border-radius: 6px; border: 1px solid var(--line); color: var(--ink-faint); }
.proj-tag.sec { color: var(--accent); border-color: var(--accent-dim); }
.proj-lang { font-family: var(--mono); font-size: 0.74rem; color: var(--ink-faint); display: flex; align-items: center; gap: 7px; }
.proj-lang .sw { width: 9px; height: 9px; border-radius: 2px; }
.proj-body { padding: 14px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.proj-body h3 { margin: 0 0 8px; font-size: 1.18rem; letter-spacing: -0.01em; }
.proj-body p { color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 16px; flex: 1; }
.proj-stack { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.proj-stack span { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); background: var(--surface-2); border: 1px solid var(--line); padding: 3px 8px; border-radius: 5px; }
.proj-links { display: flex; gap: 16px; font-family: var(--mono); font-size: 0.8rem; }
.proj-links a { color: var(--accent); display: inline-flex; align-items: center; gap: 6px; transition: gap .18s; }
.proj-links a:hover { gap: 10px; }

/* ---------- Certifications ---------- */
.cert-list { display: grid; grid-template-columns: 1fr; gap: 12px; }
.cert {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px;
  border: 1px solid var(--line); border-radius: 11px; background: var(--surface); padding: 18px 22px;
  transition: border-color .2s, transform .2s;
}
.cert:hover { border-color: var(--accent-dim); transform: translateX(4px); }
.cert .seal { width: 40px; height: 40px; border-radius: 9px; border: 1px solid var(--accent-dim); display: grid; place-items: center; color: var(--accent); font-family: var(--mono); font-size: 0.7rem; font-weight: 700; background: var(--accent-glow); flex: none; }
.cert .info h3 { margin: 0; font-size: 1rem; }
.cert .info p { margin: 3px 0 0; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); }
.cert .meta { text-align: right; font-family: var(--mono); font-size: 0.76rem; color: var(--ink-soft); white-space: nowrap; }
.cert .meta .verified { color: var(--accent); display: inline-flex; align-items: center; gap: 5px; }
@media (max-width: 620px){
  .cert { grid-template-columns: auto 1fr; }
  .cert .meta { grid-column: 2; text-align: left; margin-top: 6px; }
}

/* ---------- Education ---------- */
.edu-line { position: relative; padding-left: 28px; }
.edu-line::before { content:""; position:absolute; left:6px; top:6px; bottom:6px; width:1px; background: var(--line); }
.edu-item { position: relative; padding: 0 0 26px; }
.edu-item:last-child { padding-bottom: 0; }
.edu-item::before { content:""; position:absolute; left:-25px; top:5px; width:11px; height:11px; border-radius:50%; background: var(--bg); border: 2px solid var(--accent-dim); }
.edu-item.now::before { background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.edu-item h3 { margin: 0; font-size: 1.05rem; }
.edu-item .org { color: var(--ink-soft); font-size: 0.92rem; margin-top: 2px; }
.edu-item .when { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); margin-top: 4px; }

/* ---------- Contact ---------- */
.contact-card {
  border: 1px solid var(--surface-line); border-radius: 16px; background: var(--surface);
  padding: clamp(28px, 6vw, 44px); text-align: center; box-shadow: var(--shadow);
  background-image: radial-gradient(ellipse 60% 90% at 50% 0%, var(--accent-glow), transparent 70%);
}
.contact-card h2 { font-size: clamp(1.7rem, 6vw, 2.8rem); margin: 0 0 12px; letter-spacing: -0.02em; text-wrap: balance; }
.contact-card p { color: var(--ink-soft); max-width: 52ch; margin: 0 auto 28px; }
.contact-links { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.contact-links .btn { max-width: 100%; overflow-wrap: anywhere; }

/* ---------- Footer / misc ---------- */
footer { border-top: 1px solid var(--line); padding: 30px 0; margin-top: 40px; }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); }
.foot-inner a:hover { color: var(--accent); }

#toTop {
  position: fixed; right: 20px; bottom: 20px; z-index: 40;
  width: 44px; height: 44px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface); color: var(--accent);
  font-family: var(--mono); font-size: 1rem; cursor: pointer;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity .25s, transform .25s, border-color .18s;
}
#toTop.show { opacity: 1; pointer-events: auto; transform: none; }
#toTop:hover { border-color: var(--accent-dim); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal { opacity: 1; transform: none; transition: none; } }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }