/* ==========================================================================
   Chaostek.dev — main stylesheet
   ========================================================================== */

:root {
  --bg: #0f1216;
  --bg-elevated: #161b22;
  --bg-card: #1b2129;
  --border: #2a313c;
  --text: #d7dde5;
  --text-muted: #8b95a3;
  --heading: #f0f3f6;
  --accent: #4fa3d1;
  --accent-soft: rgba(79, 163, 209, 0.12);
  --accent-2: #3ec9a7;
  --radius: 8px;
  --max-width: 1100px;
  --header-height: 64px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  color: var(--heading);
  line-height: 1.25;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }

p {
  margin: 0 0 1em;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --------------------------------------------------------------------------
   Header / navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 18, 22, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-name {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--heading);
  letter-spacing: 0.02em;
}

.site-name:hover {
  text-decoration: none;
  color: var(--heading);
}

.site-name .tld {
  color: var(--accent);
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.main-nav a {
  display: block;
  padding: 0.45rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 500;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  text-decoration: none;
  color: var(--heading);
  background: var(--accent-soft);
  border-color: var(--accent);
  outline: none;
}

.main-nav a.active {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Main content
   -------------------------------------------------------------------------- */

main {
  flex: 1;
  padding: 2.5rem 0 3rem;
}

.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.page-header p {
  color: var(--text-muted);
  margin: 0;
}

/* Attention banner (home page) */
.banner {
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: center;
  margin-bottom: 3rem;
  padding: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background:
    radial-gradient(circle at 85% 20%, rgba(62, 201, 167, 0.15), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(79, 163, 209, 0.18), transparent 55%),
    var(--bg-elevated);
  overflow: hidden;
}

.banner-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

/* Mock code sitting behind the banner text, fading line by line */
.banner .tagline {
  position: absolute;
  top: 50%;
  right: 2.5rem;
  z-index: 0;
  margin: 0;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.9;
  text-align: right;
  color: var(--accent-2);
  pointer-events: none;
  user-select: none;
}

.banner .tagline span {
  display: block;
}

.banner .tagline span:nth-child(1) { opacity: 0.55; }
.banner .tagline span:nth-child(2) { opacity: 0.45; }
.banner .tagline span:nth-child(3) { opacity: 0.35; }
.banner .tagline span:nth-child(4) { opacity: 0.26; }
.banner .tagline span:nth-child(5) { opacity: 0.18; }
.banner .tagline span:nth-child(6) { opacity: 0.11; }

.banner p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #0b0e11;
  font-weight: 600;
  transition: background-color 0.2s, color 0.2s;
}

.btn:hover {
  text-decoration: none;
  background: transparent;
  color: var(--accent);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: #0b0e11;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* Bio section */
.bio {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.bio-photo {
  width: 220px;
  aspect-ratio: 1;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  overflow: hidden;
}

.bio-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.skills li {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(79, 163, 209, 0.3);
}

/* --------------------------------------------------------------------------
   Project cards (Code / Data pages)
   -------------------------------------------------------------------------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

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

.card-img {
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
}

.card-body p {
  color: var(--text-muted);
  font-size: 0.95rem;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.card-tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.card-links {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Project detail pages (code/)
   -------------------------------------------------------------------------- */

.back-link {
  display: inline-block;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.detail-section {
  margin-bottom: 2.5rem;
}

.detail-section > h2 {
  font-size: 1.3rem;
  color: var(--accent);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.skill-group {
  padding: 1rem 1.1rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.skill-group h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0;
}

.skill-group .skills {
  margin-top: 0.6rem;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.screenshot {
  margin: 0;
}

.screenshot-img,
.screenshot img {
  aspect-ratio: 16 / 9;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

.screenshot-img {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.screenshot img {
  aspect-ratio: auto;
  height: auto;
  transition: border-color 0.2s;
}

.screenshot a:hover img {
  border-color: var(--accent);
}

.screenshot figcaption {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Resume page
   -------------------------------------------------------------------------- */

.resume-section {
  margin-bottom: 2.5rem;
}

.resume-section > h2 {
  font-size: 1.3rem;
  color: var(--accent);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.resume-item {
  margin-bottom: 1.5rem;
}

.resume-item-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.25rem 1rem;
}

.resume-item-header h3 {
  margin: 0;
}

.resume-item .meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.resume-item .org {
  color: var(--accent-2);
  margin-bottom: 0.4rem;
}

.resume-item ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

.resume-item li {
  margin-bottom: 0.25rem;
}

.summary-list {
  margin: 0;
  padding-left: 1.2rem;
}

.employer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.25rem 1rem;
  font-weight: 600;
  color: var(--accent-2);
  margin-bottom: 1.25rem;
}

.release-note {
  margin: 2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Skills accordion */
.accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.accordion details + details {
  border-top: 1px solid var(--border);
}

.accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--heading);
  background: var(--bg-card);
  transition: background-color 0.2s;
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.accordion summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--accent);
  transition: transform 0.2s;
}

.accordion details[open] summary::after {
  transform: rotate(45deg);
}

.accordion summary:hover,
.accordion summary:focus-visible {
  background: var(--accent-soft);
  outline: none;
}

.accordion-body {
  padding: 0.25rem 1.1rem 1.1rem;
  background: var(--bg-elevated);
}

.accordion-body h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 1rem 0 0;
}

.accordion-body .skills {
  margin-top: 0.6rem;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 1.5rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0.25rem;
  }

  .banner {
    padding: 1.75rem;
    min-height: 220px;
  }

  .banner .tagline {
    right: 1.75rem;
    font-size: 0.75rem;
  }

  .bio {
    grid-template-columns: 1fr;
  }

  .bio-photo {
    width: 160px;
  }
}