:root {
  /* Light theme (default) */
  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --panel: #f6f8fa;
  --border: #d0d7de;
  --text: #24292f;
  --muted: #6e7781;
  --accent: #0969da;
  --green: #116329;
  --orange: #953800;
  --purple: #8250df;
  --pink: #cf222e;
  --shadow: rgba(140, 149, 159, 0.25);
  --max-width: 860px;
  --mono: 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --bg-alt: #10151d;
    --panel: #161b22;
    --border: #262c36;
    --text: #c9d1d9;
    --muted: #7d8590;
    --accent: #58a6ff;
    --green: #7ee787;
    --orange: #ffa657;
    --purple: #d2a8ff;
    --pink: #ff7b72;
    --shadow: rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --bg-alt: #10151d;
  --panel: #161b22;
  --border: #262c36;
  --text: #c9d1d9;
  --muted: #7d8590;
  --accent: #58a6ff;
  --green: #7ee787;
  --orange: #ffa657;
  --purple: #d2a8ff;
  --pink: #ff7b72;
  --shadow: rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--mono);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

a:hover {
  text-decoration: underline;
}

/* Syntax colors */
.kw { color: var(--pink); }
.str { color: var(--green); }
.op { color: var(--muted); }
.prop { color: var(--accent); }
.fn { color: var(--purple); }
.cls { color: var(--orange); }
.comment { color: var(--muted); }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
}

.nav {
  flex: 1;
  display: flex;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
}

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

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

:root[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

.logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.logo .punc {
  color: var(--pink);
}

.nav a {
  margin-left: 22px;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.nav a .dot {
  color: var(--pink);
}

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

/* Hero / Terminal */
.hero {
  padding: 80px 0 64px;
}

.terminal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 20px 60px var(--shadow);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.tdot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.tdot.red { background: #ff5f56; }
.tdot.yellow { background: #ffbd2e; }
.tdot.green { background: #27c93f; }

.terminal-title {
  margin-left: 10px;
  color: var(--muted);
  font-size: 0.8rem;
}

.terminal-body {
  padding: 32px 28px 36px;
}

.line {
  color: var(--muted);
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.prompt {
  color: var(--green);
  margin-right: 8px;
}

.output {
  margin: 0 0 24px;
  font-size: 1.6rem;
}

.tagline {
  font-size: 1.05rem;
  color: var(--text);
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* Buttons */
.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 22px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

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

/* Sections */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  color: var(--text);
  font-weight: 600;
}

/* Code card */
.code-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  overflow-x: auto;
}

.code-card pre {
  margin: 0;
}

.code-card code {
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.8;
  white-space: pre;
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.skill-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px;
  font-size: 0.88rem;
  transition: border-color 0.2s, transform 0.2s;
}

.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Footer */
.site-footer {
  padding: 28px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  .header-inner {
    flex-direction: column;
    gap: 10px;
    padding: 14px 20px;
  }

  .nav a {
    margin: 0 10px;
  }

  .terminal-body {
    padding: 24px 18px 28px;
  }

  .output {
    font-size: 1.25rem;
  }

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