:root {
  --yellow: #daaf38;
  --yellow-hover: #c49b28;
  --bg: #f5f5f7;
  --surface: #ffffff;
  --border: #e4e4e7;
  --text: #1a1a1a;
  --text-muted: #71717a;
  --thumb-bg: #e8e8ea;
  --tag-bg: #f0f0f2;
  --tag-text: #52525b;
  --radius: 8px;
  --max-width: 860px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Header ── */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
}

.logo-number {
  font-size: 1.4rem;
  font-weight: 900;
  color: #6b7a99;
  line-height: 1;
  letter-spacing: -0.03em;
}

.logo-js {
  background: var(--yellow);
  color: #1a1a1a;
  font-weight: 900;
  font-size: 0.7rem;
  width: 26px;
  height: 26px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-5deg);
  flex-shrink: 0;
}

.logo-days {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  transition: color 0.15s;
}

.github-link svg {
  fill: currentColor;
}

.github-link:hover {
  color: var(--text);
}

/* ── Hero ── */

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ── Project list ── */

.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.project-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--border);
}

.project-card {
  background: var(--surface);
  display: flex;
  gap: 1.5rem;
  padding: 1.25rem;
  position: relative;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

.project-card:hover {
  background: #fafafa;
  box-shadow: inset 4px 0 0 var(--yellow);
}

.project-thumb {
  width: 200px;
  height: 126px;
  flex-shrink: 0;
  background: var(--thumb-bg);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.thumb-placeholder {
  font-size: 2rem;
  font-weight: 900;
  color: #c4c4c8;
}

.project-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}

.project-meta {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.project-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.project-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.project-title a {
  color: inherit;
  text-decoration: none;
}

.project-title a::after {
  content: '';
  position: absolute;
  inset: 0;
}

.project-title a:hover {
  color: var(--yellow-hover);
}

.project-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.project-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.project-tags li {
  font-size: 11px;
  font-weight: 600;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.01em;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: color 0.15s;
  position: relative;
  z-index: 1;
}

.link-demo {
  color: var(--yellow-hover);
}

.link-demo:hover {
  color: var(--text);
}

.link-code {
  color: var(--text-muted);
}

.link-code:hover {
  color: var(--text);
}

/* ── Footer ── */

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer a:hover {
  color: var(--text);
}

/* ── Responsive ── */

@media (max-width: 640px) {
  .project-card {
    flex-direction: column;
  }

  .project-thumb {
    width: 100%;
    height: 160px;
  }
}