:root {
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --fg: #111111;
  --fg-mute: #555555;
  --line: #ebebeb;
  --accent: #ff5b1f;
  --accent-soft: rgba(255, 91, 31, 0.08);
  --card: #ffffff;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.04);
  --radius: 12px;
}

body.dark {
  --bg: #0d0d0d;
  --bg-soft: #141414;
  --fg: #f5f5f5;
  --fg-mute: #a0a0a0;
  --line: #232323;
  --accent: #ff7a44;
  --accent-soft: rgba(255, 122, 68, 0.12);
  --card: #161616;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 48px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.logo {
  font-weight: 800;
  font-size: 1.1em;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  align-items: center;
}

nav a {
  color: var(--fg-mute);
  font-weight: 500;
  font-size: 0.95em;
  transition: color 0.15s ease;
}

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

.mode-toggle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 14px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.mode-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}

body.dark .mode-toggle .mode-icon::before {
  content: "●";
}

/* Sections */
main {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: 96px 0;
  border-bottom: 1px solid var(--line);
}

section:last-of-type {
  border-bottom: none;
}

.section-tag {
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
  font-size: 0.75em;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 16px;
}

section h2 {
  font-size: 2em;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  max-width: 640px;
}

/* Hero */
#hero {
  padding: 128px 0 96px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  color: var(--accent);
  margin-bottom: 12px;
}

#hero h1 {
  font-size: 3.4em;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.3em;
  color: var(--fg-mute);
  margin-bottom: 36px;
  min-height: 1.6em;
  font-family: 'JetBrains Mono', monospace;
}

.hero-sub .cursor {
  color: var(--accent);
  animation: blink 1s steps(1) infinite;
  margin-left: 2px;
}

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

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95em;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.12s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: #e84d10;
}

.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: var(--fg);
}

/* About */
.about-body {
  font-size: 1.05em;
  color: var(--fg-mute);
  max-width: 640px;
  margin-bottom: 28px;
}

.stack-list {
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.stack-list li {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8em;
  padding: 6px 12px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 6px;
}

/* Projects */
.projects-note {
  color: var(--fg-mute);
  font-size: 0.95em;
  margin-bottom: 32px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-align: left;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.2s ease;
}

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

.project-card.skeleton {
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
}

.project-card .project-name {
  font-size: 1.1em;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.project-card .fork-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65em;
  color: var(--fg-mute);
  border: 1px solid var(--line);
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.project-card .project-desc {
  color: var(--fg-mute);
  font-size: 0.95em;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-card .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.project-card .badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7em;
  padding: 4px 8px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--fg-mute);
  border-radius: 5px;
}

.project-card .project-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85em;
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
}

.project-card .project-foot a {
  color: var(--accent);
  font-weight: 600;
}

/* Contact */
.contact-body {
  color: var(--fg-mute);
  margin-bottom: 28px;
  max-width: 540px;
}

.contact-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

#copy-email {
  position: relative;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95em;
}

#copy-email .copy-status {
  position: absolute;
  right: -12px;
  top: -8px;
  background: var(--fg);
  color: var(--bg);
  font-size: 0.7em;
  padding: 2px 8px;
  border-radius: 4px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s, transform 0.15s;
  pointer-events: none;
}

#copy-email.copied .copy-status {
  opacity: 1;
  transform: translateY(0);
}

.socials {
  display: flex;
  gap: 16px;
  align-items: center;
}

.socials a {
  color: var(--fg-mute);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  transition: color 0.15s, border-color 0.15s, transform 0.15s;
}

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

/* Footer */
footer {
  padding: 32px;
  text-align: center;
  color: var(--fg-mute);
  font-size: 0.85em;
  border-top: 1px solid var(--line);
}

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

/* Mobile */
@media (max-width: 700px) {
  nav {
    padding: 14px 20px;
  }

  nav ul {
    gap: 16px;
  }

  main {
    padding: 0 20px;
  }

  section {
    padding: 64px 0;
  }

  #hero {
    padding: 80px 0 64px;
  }

  #hero h1 {
    font-size: 2.4em;
  }

  .hero-sub {
    font-size: 1.05em;
  }

  section h2 {
    font-size: 1.5em;
  }
}