/* ==========================================================================
   Portfolio theme — "dark cyber professional" with a light variant.
   Built on Bootstrap 5.3 color modes (data-bs-theme on <html>).
   ========================================================================== */

@font-face {
  font-family: "Inter Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-latin-wght-normal.260c81a4759b.woff2") format("woff2-variations");
}
@font-face {
  font-family: "JetBrains Mono Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url("../fonts/jetbrains-mono-latin-wght-normal.b058178d7f30.woff2") format("woff2-variations");
}

:root {
  --font-sans: "Inter Variable", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono Variable", ui-monospace, "Cascadia Code", Consolas, monospace;
  --radius: .9rem;
  --bs-body-font-family: var(--font-sans);
  --bs-font-monospace: var(--font-mono);
}

[data-bs-theme="dark"] {
  --bg: #070d1a;
  --bg-soft: #0b1426;
  --surface: #0f1a30;
  --surface-2: #13213b;
  --border: #1d2c4a;
  --text: #e6edf7;
  --muted: #93a4bf;
  --accent: #22d3ee;
  --accent-2: #34d399;
  --accent-contrast: #04111c;
  --glow: rgba(34, 211, 238, .18);
  --grid-line: rgba(148, 163, 184, .06);
  --bs-body-bg: var(--bg);
  --bs-body-color: var(--text);
  --bs-secondary-color: var(--muted);
  --bs-border-color: var(--border);
  --bs-link-color-rgb: 34, 211, 238;
  --bs-link-hover-color-rgb: 103, 232, 249;
  --bs-tertiary-bg: var(--surface);
}

[data-bs-theme="light"] {
  --bg: #f6f8fb;
  --bg-soft: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #dbe3ee;
  --text: #0f172a;
  --muted: #526179;
  --accent: #0e7490;
  --accent-2: #047857;
  --accent-contrast: #ffffff;
  --glow: rgba(14, 116, 144, .12);
  --grid-line: rgba(15, 23, 42, .05);
  --bs-body-bg: var(--bg);
  --bs-body-color: var(--text);
  --bs-secondary-color: var(--muted);
  --bs-border-color: var(--border);
  --bs-link-color-rgb: 14, 116, 144;
  --bs-link-hover-color-rgb: 21, 94, 117;
}

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }
::selection { background: var(--accent); color: var(--accent-contrast); }
.font-mono, code, kbd, pre { font-family: var(--font-mono); }
.text-accent { color: var(--accent) !important; }
.text-accent-2 { color: var(--accent-2) !important; }
.text-muted-2 { color: var(--muted) !important; }
a { text-underline-offset: .2em; }

.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 2000;
  background: var(--accent); color: var(--accent-contrast); padding: .5rem 1rem; border-radius: .5rem;
}
.skip-link:focus { top: 1rem; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Navbar ---------- */
.site-nav {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-nav .navbar-brand { font-weight: 700; letter-spacing: -.01em; color: var(--text); }
.brand-mark {
  display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: .6rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-contrast);
  font-family: var(--font-mono); font-weight: 700; font-size: .85rem;
}
.site-nav .nav-link { color: var(--muted); font-weight: 500; }
.site-nav .nav-link:hover, .site-nav .nav-link.active { color: var(--text); }
.site-nav .nav-link.active { position: relative; }
@media (min-width: 992px) {
  .site-nav .nav-link.active::after {
    content: ""; position: absolute; left: .5rem; right: .5rem; bottom: -.15rem; height: 2px;
    background: var(--accent); border-radius: 2px;
  }
}
.theme-toggle { color: var(--muted); border: 1px solid var(--border); background: transparent; }
.theme-toggle:hover { color: var(--text); border-color: var(--accent); }
[data-bs-theme="dark"] .theme-toggle .icon-light { display: none; }
[data-bs-theme="light"] .theme-toggle .icon-dark { display: none; }
.lang-switch { color: var(--muted); border: 1px solid var(--border); background: transparent;
  font-family: var(--bs-font-monospace); font-weight: 600; letter-spacing: .04em; }
.lang-switch:hover, .lang-switch:focus-visible { color: var(--text); border-color: var(--accent); }

/* ---------- Buttons ---------- */
.btn-accent {
  --bs-btn-color: var(--accent-contrast);
  --bs-btn-bg: var(--accent);
  --bs-btn-border-color: var(--accent);
  --bs-btn-hover-color: var(--accent-contrast);
  --bs-btn-hover-bg: color-mix(in srgb, var(--accent) 85%, white);
  --bs-btn-hover-border-color: color-mix(in srgb, var(--accent) 85%, white);
  --bs-btn-active-bg: var(--accent);
  --bs-btn-active-color: var(--accent-contrast);
  font-weight: 600;
  box-shadow: 0 0 0 0 var(--glow);
  transition: box-shadow .2s ease, transform .2s ease;
}
.btn-accent:hover { box-shadow: 0 8px 30px var(--glow); transform: translateY(-1px); }
.btn-ghost {
  --bs-btn-color: var(--text);
  --bs-btn-border-color: var(--border);
  --bs-btn-hover-color: var(--text);
  --bs-btn-hover-bg: var(--surface-2);
  --bs-btn-hover-border-color: var(--accent);
  --bs-btn-active-bg: var(--surface-2);
  --bs-btn-active-color: var(--text);
  font-weight: 500;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(4rem, 10vw, 8rem) 0 clamp(3rem, 7vw, 6rem);
  background:
    radial-gradient(60rem 30rem at 85% -10%, var(--glow), transparent 60%),
    radial-gradient(40rem 25rem at -10% 110%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 60%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 75%);
}
.hero > .container { position: relative; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .04em;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  padding: .35rem .75rem; border-radius: 999px;
}
.status-dot {
  width: .5rem; height: .5rem; border-radius: 50%; background: var(--accent-2);
  box-shadow: 0 0 0 0 var(--accent-2); animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent-2) 60%, transparent); }
  70% { box-shadow: 0 0 0 .5rem transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.display-hero { font-size: clamp(2.2rem, 5.2vw, 4rem); font-weight: 750; letter-spacing: -.03em; line-height: 1.08; }
.gradient-text {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead-muted { color: var(--muted); font-size: clamp(1.05rem, 1.6vw, 1.2rem); max-width: 42rem; }

.terminal {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .55);
  font-family: var(--font-mono); font-size: .85rem; overflow: hidden;
}
.terminal-bar { display: flex; gap: .4rem; padding: .7rem .9rem; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.terminal-bar span { width: .7rem; height: .7rem; border-radius: 50%; background: var(--border); }
.terminal-bar span:nth-child(1) { background: #f87171; }
.terminal-bar span:nth-child(2) { background: #fbbf24; }
.terminal-bar span:nth-child(3) { background: #34d399; }
.terminal-body { padding: 1rem 1.1rem; line-height: 1.75; }
.terminal-body .prompt { color: var(--accent-2); }
.terminal-body .out { color: var(--muted); }
.terminal-body .ok { color: var(--accent-2); }
.terminal-body .hl { color: var(--accent); }
.cursor { display: inline-block; width: .55rem; height: 1rem; background: var(--accent); vertical-align: text-bottom; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.avatar {
  width: 4.5rem; height: 4.5rem; border-radius: 50%; object-fit: cover;
  border: 2px solid var(--accent); box-shadow: 0 0 0 4px var(--glow);
}

/* ---------- Sections & cards ---------- */
.section { padding: clamp(3.5rem, 7vw, 6rem) 0; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-label { font-family: var(--font-mono); color: var(--accent); font-size: .85rem; letter-spacing: .06em; text-transform: uppercase; }
.section-title { font-weight: 700; letter-spacing: -.02em; font-size: clamp(1.7rem, 3.2vw, 2.4rem); }

.card-x {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; height: 100%;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
a.card-x, .card-x.hoverable { color: inherit; text-decoration: none; display: block; }
a.card-x:hover, .card-x.hoverable:hover {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -22px var(--glow);
}
.icon-box {
  display: inline-grid; place-items: center; width: 2.75rem; height: 2.75rem; border-radius: .75rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); font-size: 1.3rem;
}

.metric { text-align: left; }
.metric-value { font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 750; letter-spacing: -.03em; line-height: 1; }
.metric-label { color: var(--muted); font-size: .92rem; margin-top: .4rem; }
a.metric { color: inherit; }
a.metric:hover .metric-label { color: var(--text); }

/* About page: skills as rounded labels, one row per area. */
.skill-pill {
  font-family: var(--font-mono); font-size: .82rem; padding: .3rem .75rem; border-radius: .5rem;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
}

.chip {
  display: inline-flex; align-items: center; gap: .3rem; font-size: .78rem; font-family: var(--font-mono);
  padding: .2rem .6rem; border-radius: 999px; border: 1px solid var(--border); color: var(--muted);
  background: var(--surface-2); text-decoration: none; white-space: nowrap;
}
a.chip:hover, .chip.active { color: var(--accent-contrast); background: var(--accent); border-color: var(--accent); }
.badge-level { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; }
/* Long category names must stay inside the card: let the chip wrap and the level drop to the next line. */
.project-card .chip { white-space: normal; min-width: 0; }
.badge-level { white-space: nowrap; }
.level-beginner { color: var(--accent-2); }
.level-intermediate { color: #fbbf24; }
.level-advanced { color: #f87171; }

.project-card .cover {
  aspect-ratio: 16 / 9; width: 100%; border-radius: calc(var(--radius) - .3rem);
  border: 1px solid var(--border); margin-bottom: 1rem;
  /* Covers are architecture diagrams: show them whole instead of cropping the edges. */
  object-fit: contain; background: #ffffff;
}
.project-card .cover-fallback {
  aspect-ratio: 16 / 9; border-radius: calc(var(--radius) - .3rem); margin-bottom: 1rem;
  display: grid; place-items: center; font-size: 2.4rem; color: var(--accent);
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 22px 22px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 22px 22px,
    radial-gradient(circle at 30% 20%, var(--glow), transparent 70%), var(--surface-2);
  border: 1px solid var(--border);
}

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 1.75rem; }
.timeline::before { content: ""; position: absolute; left: .45rem; top: .3rem; bottom: .3rem; width: 2px; background: var(--border); }
.timeline-item { position: relative; padding-bottom: 2rem; }
.timeline-item::before {
  content: ""; position: absolute; left: -1.62rem; top: .35rem; width: .9rem; height: .9rem; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.timeline-item:first-child::before { background: var(--accent); box-shadow: 0 0 0 4px var(--glow); }
.timeline-period { font-family: var(--font-mono); font-size: .8rem; color: var(--accent); }
.check-list { list-style: none; padding-left: 0; }
.check-list li { position: relative; padding-left: 1.6rem; margin-bottom: .55rem; color: var(--muted); }
.check-list li::before {
  content: "\F26E"; font-family: "bootstrap-icons"; position: absolute; left: 0; top: .05rem; color: var(--accent-2);
}

/* ---------- Skills ---------- */
.skill-dots { display: inline-flex; gap: .2rem; }
.skill-dots i { width: .45rem; height: .45rem; border-radius: 50%; background: var(--border); display: block; }
.skill-dots i.on { background: var(--accent); }

/* ---------- Write-up / prose ---------- */
.prose { font-size: 1.04rem; line-height: 1.75; }
.prose h2 { font-size: 1.55rem; font-weight: 700; margin-top: 2.5rem; margin-bottom: 1rem; letter-spacing: -.01em; }
.prose h3 { font-size: 1.2rem; font-weight: 650; margin-top: 2rem; }
.prose p, .prose li { color: color-mix(in srgb, var(--text) 88%, var(--muted)); }
.prose img { max-width: 100%; height: auto; border-radius: .6rem; border: 1px solid var(--border); }
.prose blockquote {
  border-left: 3px solid var(--accent); padding: .6rem 1rem; margin: 1.5rem 0;
  background: var(--surface); border-radius: 0 .6rem .6rem 0; color: var(--muted);
}
.prose table { width: 100%; margin: 1.5rem 0; border-collapse: collapse; font-size: .92rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: .5rem .75rem; }
.prose th { background: var(--surface-2); }
.prose :not(pre) > code {
  background: var(--surface-2); border: 1px solid var(--border); padding: .1rem .35rem; border-radius: .35rem;
  font-size: .88em; color: var(--accent);
}
.codehilite, .prose pre {
  background: var(--surface) !important; border: 1px solid var(--border); border-radius: .7rem;
  padding: 1rem 1.1rem; overflow-x: auto; font-size: .86rem; line-height: 1.6; margin: 1.25rem 0;
}
.codehilite pre { margin: 0; padding: 0; border: 0; background: transparent !important; }
.snippet { position: relative; }
.snippet-head {
  display: flex; justify-content: space-between; align-items: center; gap: .5rem;
  padding: .55rem .9rem; background: var(--surface-2); border: 1px solid var(--border); border-bottom: 0;
  border-radius: .7rem .7rem 0 0; font-family: var(--font-mono); font-size: .8rem; color: var(--muted);
}
.snippet .codehilite { border-radius: 0 0 .7rem .7rem; margin-top: 0; }
.copy-btn { font-size: .78rem; padding: .15rem .55rem; }
.toc { position: sticky; top: 6rem; font-size: .9rem; }
.toc ul { list-style: none; padding-left: 0; }
.toc ul ul { padding-left: .9rem; }
.toc a { color: var(--muted); text-decoration: none; display: block; padding: .2rem 0; }
.toc a:hover { color: var(--accent); }
.notice {
  border: 1px dashed color-mix(in srgb, #fbbf24 60%, var(--border)); background: color-mix(in srgb, #fbbf24 7%, transparent);
  border-radius: .7rem; padding: .8rem 1rem; font-size: .9rem; color: var(--muted);
}
.hash { font-family: var(--font-mono); font-size: .75rem; word-break: break-all; color: var(--muted); }

/* ---------- Forms ---------- */
.form-control, .form-select {
  background-color: var(--surface); border-color: var(--border); color: var(--text); padding: .7rem .9rem;
}
.form-control:focus, .form-select:focus {
  background-color: var(--surface); color: var(--text); border-color: var(--accent);
  box-shadow: 0 0 0 .2rem var(--glow);
}
.form-control::placeholder { color: color-mix(in srgb, var(--muted) 70%, transparent); }
.hp-field { position: absolute !important; left: -10000px !important; width: 1px; height: 1px; overflow: hidden; }

/* ---------- CTA & footer ---------- */
.cta {
  border: 1px solid var(--border); border-radius: calc(var(--radius) + .4rem); padding: clamp(2rem, 5vw, 3.5rem);
  background: radial-gradient(40rem 20rem at 100% 0%, var(--glow), transparent 60%), var(--surface);
}
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); color: var(--muted); font-size: .92rem; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.social a { display: inline-grid; place-items: center; width: 2.4rem; height: 2.4rem; border-radius: .6rem; border: 1px solid var(--border); font-size: 1.1rem; }
.social a:hover { border-color: var(--accent); }

.error-page { min-height: 55vh; display: flex; flex-direction: column; align-items: center; justify-content: center; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}