:root {
  --bg: #0b0f17;
  --paper: #11161f;
  --paper-soft: #161c27;
  --ink: #e8edf6;
  --muted: #9aa6b8;
  --line: #232b3a;
  --accent: #5b8cff;
  --accent-soft: rgba(91, 140, 255, 0.12);
  --accent-line: rgba(91, 140, 255, 0.35);
  --success: #34d399;
  --warning: #f59e0b;
  --shadow: 0 18px 40px rgba(0,0,0,0.35);
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, Arial, sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

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

/* ---------- Nav ---------- */
header.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.nav-logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; color: var(--ink); text-decoration: none; letter-spacing: 0.5px; }
.nav-logo span { color: var(--accent); }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 9px; background: var(--paper-soft);
  border: 1px solid var(--line); color: var(--accent);
  font-family: Consolas, monospace; font-weight: 800; font-size: 0.95rem;
}
.nav-links { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: 0.92rem; }
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  background: var(--accent); color: #fff; padding: 8px 16px; border-radius: 999px;
  font-weight: 700; font-size: 0.88rem; text-decoration: none;
}
.nav-toggle { display: none; }

.social-links { display: flex; align-items: center; gap: 14px; }
.social-links a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px;
  color: var(--muted); border: 1px solid var(--line); background: var(--paper-soft, var(--paper));
  transition: color 0.15s ease, border-color 0.15s ease;
}
.social-links a:hover { color: var(--accent); border-color: var(--accent-line); }
.social-links svg { width: 18px; height: 18px; fill: currentColor; }

.detail-topbar { display: flex; align-items: center; justify-content: space-between; margin: 24px 0 0; }
.detail-topbar .back-link { margin: 0; }

/* ---------- Hero ---------- */
main { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.hero {
  padding: 90px 0 70px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block; color: var(--accent); font-weight: 700; font-size: 0.85rem;
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 14px;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin: 0 0 14px; line-height: 1.1; }
.hero h1 .accent { color: var(--accent); }
.hero p.lead { color: var(--muted); font-size: 1.08rem; max-width: 520px; margin: 0 0 26px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 10px; font-weight: 700; font-size: 0.92rem;
  text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #4877e6; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.hero-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.hero-card dl { margin: 0; display: grid; gap: 14px; }
.hero-card dt { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 2px; }
.hero-card dd { margin: 0; font-weight: 650; }

/* ---------- Section shell ---------- */
section { padding: 60px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: none; }
.section-head { margin-bottom: 28px; }
.section-eyebrow { color: var(--accent); font-weight: 700; font-size: 0.8rem; letter-spacing: 1.2px; text-transform: uppercase; }
.section-head h2 { margin: 6px 0 8px; font-size: 1.7rem; }
.section-head p { color: var(--muted); margin: 0; max-width: 620px; }

.feedback-teaser { display: block; text-decoration: none; }
.feedback-teaser .section-head { margin-bottom: 0; }
.feedback-teaser .section-head h2 { color: var(--ink); }
.feedback-teaser:hover .section-head h2 { color: var(--accent); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.about-item {
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px;
}
.about-item strong { display: block; color: var(--ink); margin-bottom: 4px; }
.about-item span { color: var(--muted); font-size: 0.92rem; }

/* ---------- Experience timeline ---------- */
.timeline { display: grid; gap: 18px; }
.job {
  background: var(--paper); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 12px; padding: 18px 22px;
}
.job-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.job h3 { margin: 0; font-size: 1.08rem; }
.job-period { color: var(--accent); font-size: 0.85rem; font-weight: 700; }
.job-role { color: var(--muted); font-size: 0.92rem; margin: 2px 0 10px; }
.job ul { margin: 0; padding-left: 20px; color: #c7d0de; }
.job li { margin: 4px 0; }

/* ---------- Skills collage ---------- */
:root {
  --cat-lang: #dd9a4c;
  --cat-data: #4fb0ab;
  --cat-sys:  #7cb56d;
  --cat-net:  #7f90dd;
  --cat-sec:  #da7660;
  --cat-biz:  #ab8bb5;
}

.collage-board {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; display: flex; flex-wrap: wrap; gap: 12px 10px; justify-content: flex-start;
}

.collage-tag {
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-weight: 700; display: inline-block; padding: .5em .85em; border-radius: 7px;
  background: var(--chip-bg); color: var(--chip-fg); border: 1px solid var(--chip-border);
  box-shadow: 0 6px 14px -8px rgba(0,0,0,.6);
  white-space: nowrap; transform: rotate(var(--rot, 0deg));
  transition: transform .18s ease, box-shadow .18s ease;
}
@media (prefers-reduced-motion: no-preference) {
  .collage-tag:hover { transform: rotate(0deg) translateY(-3px) scale(1.04); box-shadow: 0 14px 22px -10px rgba(0,0,0,.55); z-index: 2; position: relative; }
}

.collage-tag.size-1 { font-size: clamp(1.05rem, 2vw, 1.3rem); }
.collage-tag.size-2 { font-size: clamp(.9rem, 1.6vw, 1.02rem); }
.collage-tag.size-3 { font-size: clamp(.76rem, 1.3vw, .88rem); }
.collage-tag.cert-tag { white-space: normal; text-align: center; max-width: 15em; line-height: 1.35; }

.collage-tag:nth-of-type(6n+1) { --rot: -3deg; }
.collage-tag:nth-of-type(6n+2) { --rot: 2deg; }
.collage-tag:nth-of-type(6n+3) { --rot: -1deg; }
.collage-tag:nth-of-type(6n+4) { --rot: 3deg; }
.collage-tag:nth-of-type(6n+5) { --rot: -2.5deg; }
.collage-tag:nth-of-type(6n+6) { --rot: 1.5deg; }

.cat-lang, .cat-data, .cat-sys, .cat-net, .cat-sec, .cat-biz {
  --chip-bg: var(--paper); --chip-border: var(--line);
}
.cat-lang { --chip-fg: var(--cat-lang); --chip-bg: color-mix(in srgb, var(--cat-lang) 20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-lang) 45%, transparent); }
.cat-data { --chip-fg: var(--cat-data); --chip-bg: color-mix(in srgb, var(--cat-data) 20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-data) 45%, transparent); }
.cat-sys  { --chip-fg: var(--cat-sys);  --chip-bg: color-mix(in srgb, var(--cat-sys)  20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-sys)  45%, transparent); }
.cat-net  { --chip-fg: var(--cat-net);  --chip-bg: color-mix(in srgb, var(--cat-net)  20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-net)  45%, transparent); }
.cat-sec  { --chip-fg: var(--cat-sec);  --chip-bg: color-mix(in srgb, var(--cat-sec)  20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-sec)  45%, transparent); }
.cat-biz  { --chip-fg: var(--cat-biz);  --chip-bg: color-mix(in srgb, var(--cat-biz)  20%, var(--paper)); --chip-border: color-mix(in srgb, var(--cat-biz)  45%, transparent); }

.collage-legend {
  list-style: none; display: flex; flex-wrap: wrap; gap: 10px 22px; padding: 0; margin: 16px 0 0;
  font-size: .8rem; color: var(--muted);
}
.collage-legend li { display: flex; align-items: center; gap: 8px; }
.collage-legend .dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.collage-legend .dot.cat-lang { background: var(--cat-lang); }
.collage-legend .dot.cat-data { background: var(--cat-data); }
.collage-legend .dot.cat-sys  { background: var(--cat-sys); }
.collage-legend .dot.cat-net  { background: var(--cat-net); }
.collage-legend .dot.cat-sec  { background: var(--cat-sec); }
.collage-legend .dot.cat-biz  { background: var(--cat-biz); }

.github-stats {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  margin-top: 28px; padding: 20px; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius);
}
.github-stats img { display: block; border-radius: 10px; max-width: 320px; width: 100%; height: auto; }
.github-stats-cta { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.btn-lg { padding: 14px 28px; font-size: 1.05rem; border-radius: 12px; }
.dynamic-note {
  display: flex; align-items: center; gap: 8px; margin: 0;
  font-size: 0.82rem; color: var(--muted);
}
.dynamic-note::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--success); box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
}

/* ---------- Project grid ---------- */
.project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent-line); }
.card-title { padding: 16px 20px 0; }
.card-title h3 { margin: 0; font-size: 1.05rem; color: var(--ink); }
.card-media {
  position: relative; aspect-ratio: 16/10; background: #060a10; overflow: hidden;
  margin-top: 10px;
}
.card-media img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain;
  opacity: 0; pointer-events: none; transition: opacity 0.25s ease; cursor: zoom-in;
}
.card-media img.active { opacity: 1; pointer-events: auto; }
.card-thumbs { display: flex; gap: 6px; padding: 8px; background: var(--paper-soft); }
.card-thumbs button {
  flex: 1; height: 30px; border-radius: 6px; border: 2px solid var(--line);
  background-size: cover; background-position: center; cursor: pointer; padding: 0;
}
.card-thumbs button.active, .card-thumbs button:hover { border-color: var(--accent); }
.card-thumbs button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card-body p { color: var(--muted); font-size: 0.92rem; margin: 0 0 12px; flex: 1; }
.card-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.card-badge { background: var(--paper-soft); border: 1px solid var(--line); color: #c7d0de; border-radius: 999px; padding: 3px 10px; font-size: 0.74rem; font-weight: 600; }
.ai-note { display: flex; align-items: center; gap: 6px; font-size: 0.8rem; color: var(--success); margin-top: 4px; }
.ai-note::before { content: "✓"; font-weight: 800; }

.coming-later { font-size: 0.78rem; color: var(--muted); font-style: italic; margin: 4px 0 0; }
.card-footer { display: flex; justify-content: flex-end; gap: 14px; padding: 0 20px 18px; }
.card-link {
  font-weight: 700; font-size: 0.86rem; text-decoration: none; color: var(--accent);
  display: inline-flex; align-items: center; gap: 4px;
}
.card-link:hover { text-decoration: underline; }

/* ---------- Footer ---------- */
footer { text-align: center; color: var(--muted); padding: 40px 0 60px; font-size: 0.88rem; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 50px; }
  .about-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}

/* ---------- App detail pages ---------- */
.back-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: 0.9rem; text-decoration: none; color: var(--muted); margin: 32px 0 10px; }
.back-link:hover { color: var(--accent); }

.detail-hero { padding: 10px 0 30px; }
.detail-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 8px 0 10px; }
.detail-hero p.lead { color: var(--muted); font-size: 1.04rem; max-width: 640px; margin: 0 0 16px; }

.detail-slideshow {
  position: relative; width: 100%; aspect-ratio: 16/9; margin: 0 0 12px;
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  box-shadow: var(--shadow); background: #060a10;
}
.detail-slideshow img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain;
  opacity: 0; pointer-events: none; transition: opacity 0.25s ease; cursor: zoom-in;
}
.detail-slideshow img.active { opacity: 1; pointer-events: auto; }

/* ---------- Lightbox ---------- */
.lightbox-overlay {
  position: fixed; inset: 0; background: rgba(6, 10, 16, 0.92); z-index: 999;
  display: flex; align-items: center; justify-content: center; padding: 40px;
  cursor: zoom-out; opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.lightbox-overlay.open { opacity: 1; pointer-events: auto; }
.lightbox-overlay img {
  max-width: 100%; max-height: 100%; border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5); cursor: default;
}
.lightbox-close {
  position: absolute; top: 20px; right: 24px; background: none; border: none;
  color: #fff; font-size: 2rem; line-height: 1; cursor: pointer; opacity: 0.8;
}
.lightbox-close:hover { opacity: 1; }
.detail-placeholder {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 8px; color: var(--muted);
}
.detail-placeholder .icon { font-size: 2.4rem; }
.detail-thumbs { display: flex; gap: 8px; margin-bottom: 28px; }
.detail-thumbs button {
  flex: 1; height: 64px; border-radius: 10px; border: 2px solid var(--line);
  background-size: cover; background-position: center; cursor: pointer; padding: 0; background-color: var(--paper-soft);
}
.detail-thumbs button.active, .detail-thumbs button:hover { border-color: var(--accent); }

.mockup-frame {
  background: #dbe4f0; border-radius: 28px; padding: 14px;
  box-shadow: 0 30px 70px rgba(0,0,0,0.45); border: 1px solid #c7d2e3;
  margin-bottom: 28px; overflow: auto;
}
.mockup-frame img { width: 100%; border-radius: 18px; display: block; }

/* ---------- Detail page footer sections (Core MVP / Employer Skills / Future Features) ---------- */
.sections { display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 10px; }
.section-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 20px;
}
.section-card h3 { margin: 0 0 12px; font-size: 1.02rem; color: var(--ink); }
.section-card ul { color: var(--muted); line-height: 1.7; padding-left: 20px; margin: 0; font-size: 0.92rem; }

@media (max-width: 860px) {
  .sections { grid-template-columns: 1fr; }
}

/* ---------- Blazor error UI ---------- */
#blazor-error-ui {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--warning);
  color: #1a1400;
  padding: 0.75rem 3rem 0.75rem 1.25rem;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.35);
}
#blazor-error-ui .reload {
  color: #1a1400;
  font-weight: 600;
  text-decoration: underline;
  margin-left: 0.5rem;
  cursor: pointer;
}
#blazor-error-ui .dismiss {
  position: absolute;
  right: 1rem;
  top: 0.75rem;
  cursor: pointer;
}

/* ---------- Feedback form ---------- */
.feedback-form {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; display: grid; gap: 18px; max-width: 640px;
}
.feedback-field { display: grid; gap: 8px; }
.feedback-field label { color: var(--ink); font-weight: 600; font-size: 0.92rem; }
.feedback-field select,
.feedback-field input[type="text"],
.feedback-field textarea {
  background: var(--paper-soft); color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 10px 12px; font: inherit; resize: vertical;
}
.feedback-field select:focus,
.feedback-field input[type="text"]:focus,
.feedback-field textarea:focus {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
.feedback-form .btn { border: none; align-self: start; }
.feedback-form .btn:disabled { opacity: 0.6; }
.feedback-error { color: var(--cat-sec); font-size: 0.88rem; margin: 0; }
.feedback-thanks {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; max-width: 640px;
}
.feedback-thanks ul { margin: 10px 0; padding-left: 20px; color: #c7d0de; }
.feedback-thanks li { margin: 4px 0; }