/* ===== Variables ===== */
:root {
  --bg:           #0d1117;
  --surface:      #161b22;
  --text:         #e6edf3;
  --text-muted:   #8b949e;
  --accent:       #00b4d8;
  --border:       #30363d;
  --font-sans:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;
  --max-width:    680px;
  --dot:          rgba(255, 255, 255, 0.045);
  --glow:         rgba(0, 180, 216, 0.07);
}

[data-theme="light"] {
  --bg:           #ffffff;
  --surface:      #f6f8fa;
  --text:         #1a1a2e;
  --text-muted:   #57606a;
  --accent:       #0284c7;
  --border:       #d0d7de;
  --dot:          rgba(0, 0, 0, 0.05);
  --glow:         rgba(2, 132, 199, 0.04);
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 75% 40% at 50% 0%, var(--glow) 0%, transparent 100%),
    radial-gradient(var(--dot) 1px, transparent 1px);
  background-size: auto, 20px 20px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  padding: 2rem 1.25rem;
  transition: background 0.2s, color 0.2s;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== Corner brackets ===== */
body::before,
body::after {
  content: '';
  position: fixed;
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 50;
  opacity: 0.22;
  border-color: var(--accent);
  border-style: solid;
}

body::before {
  top: 1.25rem;
  left: 1.25rem;
  border-width: 1.5px 0 0 1.5px;
}

body::after {
  bottom: 1.25rem;
  right: 1.25rem;
  border-width: 0 1.5px 1.5px 0;
}

/* ===== Theme toggle ===== */
#theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0.4rem 0.6rem;
  transition: border-color 0.2s;
  z-index: 100;
}

#theme-toggle:hover { border-color: var(--accent); }

/* ===== Site nav ===== */
.site-nav { padding: 1.5rem 0 0; }

.back-home {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
}

.back-home:hover { color: var(--accent); }

/* ===== Hero ===== */
.hero { padding: 3rem 0 2.5rem; }

.hero h1 {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  margin-bottom: 0.3rem;
}

.alias {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
  text-shadow: 0 0 18px rgba(0, 180, 216, 0.4);
}

[data-theme="light"] .alias {
  text-shadow: none;
}

.alias::after {
  content: '_';
  animation: blink 1.2s step-end infinite;
  margin-left: 1px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== Sections ===== */
section {
  padding: 2.25rem 0;
  border-top: 1px solid var(--border);
}

h2 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

h2::before {
  content: '// ';
  color: var(--accent);
  font-family: var(--font-mono);
  opacity: 0.6;
  text-transform: none;
  letter-spacing: 0;
}

p { margin-bottom: 0.75rem; }
p:last-child { margin-bottom: 0; }

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

.muted {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-style: italic;
}

/* ===== Results ===== */
.result-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}

.result-rank {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  min-width: 40px;
  padding-top: 0.1rem;
}

.result-item strong {
  display: block;
  font-size: 0.95rem;
}

/* ===== Events ===== */
.event-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.event-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.event-item .year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 40px;
  padding-top: 0.15rem;
}

.event-item strong {
  display: block;
  font-size: 0.95rem;
}

/* ===== Project / authored list ===== */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: block;
  padding: 1.1rem 1.25rem;
  text-decoration: none;
  transition: border-color 0.2s;
}

.project-item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 0 20px rgba(0, 180, 216, 0.08);
  text-decoration: none;
}

.writeup-item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 0 20px rgba(0, 180, 216, 0.08);
  text-decoration: none;
}

.project-item-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.project-item-header strong { color: var(--text); font-size: 0.95rem; }

.project-item p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0 0 0.5rem;
}

.project-item p:last-child { margin-bottom: 0; }

/* ===== Writeup list ===== */
.writeup-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.writeup-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.2s;
}

.writeup-item:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.writeup-item-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.writeup-item-header strong {
  color: var(--text);
  font-size: 0.9rem;
}

.writeup-item .muted {
  font-size: 0.78rem;
  font-style: normal;
  white-space: nowrap;
}

/* ===== Status badges ===== */
.status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.status-ongoing   { border-color: var(--accent); color: var(--accent); }
.status-completed { border-color: #3fb950; color: #3fb950; }
.status-planned   { border-color: var(--border); color: var(--text-muted); }

/* ===== Tags ===== */
.tags-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  color: var(--text-muted);
}

/* ===== Entry (writeup page) ===== */
.entry { padding: 2rem 0; }

.entry-header { margin-bottom: 2rem; }

.back-link {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 1rem;
}

.back-link:hover { color: var(--accent); text-decoration: none; }

.entry-header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 0.75rem;
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.entry-content {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
}

.entry-content h2 {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
  margin: 1.75rem 0 0.75rem;
}

.entry-content h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.25rem 0 0.5rem;
}

.entry-content p { margin-bottom: 0.875rem; }

.entry-content ul,
.entry-content ol {
  padding-left: 1.5rem;
  margin-bottom: 0.875rem;
}

.entry-content li { margin-bottom: 0.25rem; }

.entry-content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

.entry-content code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.entry-content p code,
.entry-content li code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.35rem;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 1rem;
  margin-top: 1rem;
}

.social { display: flex; flex-wrap: wrap; gap: 1.25rem; }

.social a { color: var(--text-muted); font-size: 0.875rem; }

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

/* ===== Scroll fade-in ===== */
.fade-in {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 540px) {
  .hero h1 { font-size: 1.75rem; }

  .writeup-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
}