/* Sparks Blog */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #fafafa;
  --bg-secondary: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --code-bg: #f3f4f6;
  --tag-bg: #eff6ff;
  --tag-text: #2563eb;
  --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --radius: 12px;
  --search-bg: #ffffff;
  --search-focus: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --text: #f0f0f0;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --accent: #60a5fa;
    --accent-hover: #93bbfd;
    --border: #2a2a2a;
    --border-light: #222222;
    --code-bg: #1e1e1e;
    --tag-bg: #1e293b;
    --tag-text: #60a5fa;
    --shadow: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.3);
    --search-bg: #1a1a1a;
    --search-focus: #60a5fa;
  }
}

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

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Header */
.site-header {
  text-align: center;
  padding: 3.5rem 0 2.5rem;
  margin-bottom: 2rem;
}
.site-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}
.site-header p {
  color: var(--text-tertiary);
  margin-top: 0.5rem;
  font-size: 0.88rem;
  font-weight: 300;
  letter-spacing: 0.02em;
}

/* Search */
.search-wrap {
  position: relative;
  margin-bottom: 2rem;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  width: 16px;
  height: 16px;
}
.search-input {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--search-bg);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input::placeholder {
  color: var(--text-tertiary);
}
.search-input:focus {
  border-color: var(--search-focus);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.search-clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  display: none;
  padding: 2px;
}
.search-clear:hover { color: var(--text-secondary); }
.search-empty {
  text-align: center;
  color: var(--text-tertiary);
  padding: 3rem 1rem;
  font-size: 0.9rem;
  display: none;
}

/* Stats bar */
.stats-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
  padding: 0 0.25rem;
}
.stats-count { font-variant-numeric: tabular-nums; }

/* Index */
.month-group { margin-bottom: 1.5rem; }
.month-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
  padding: 0 0.25rem;
}
.post-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 1rem;
  margin: 0 -0.25rem;
  border-radius: 10px;
  transition: background 0.15s;
  cursor: pointer;
  text-decoration: none;
}
.post-item:hover {
  background: var(--bg-secondary);
}
.post-date {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  min-width: 4.5em;
  flex-shrink: 0;
}
.post-title {
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.5;
}
.post-item:hover .post-title { color: var(--accent); }

/* Post page */
.post-header { margin-bottom: 2rem; }
.post-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.8rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.post-tags { display: inline-flex; gap: 0.3rem; }
.tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.55rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 99px;
  font-weight: 500;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.15s;
}
.back-link:hover { color: var(--accent); }

/* Content */
.post-content h1 { font-size: 1.5rem; margin: 2rem 0 1rem; font-weight: 700; }
.post-content h2 { font-size: 1.25rem; margin: 1.8rem 0 0.8rem; font-weight: 700; }
.post-content h3 { font-size: 1.1rem; margin: 1.5rem 0 0.6rem; font-weight: 500; }
.post-content p { margin-bottom: 1rem; }
.post-content ul, .post-content ol { margin: 0.5rem 0 1rem 1.5rem; }
.post-content li { margin-bottom: 0.3rem; }
.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
}
.post-content a { color: var(--accent); text-decoration: none; }
.post-content a:hover { text-decoration: underline; }
.post-content img { max-width: 100%; border-radius: 8px; margin: 1rem 0; }
.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}
.post-content strong { font-weight: 700; }
.post-content em { font-style: italic; }

/* Code */
.post-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}
.post-content pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 1.2rem;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
}
.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Table */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.post-content th, .post-content td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}
.post-content th { background: var(--bg-secondary); font-weight: 500; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-tertiary);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

@media (max-width: 600px) {
  .container { padding: 1rem 1rem 3rem; }
  .site-header { padding: 2.5rem 0 1.5rem; }
  .site-header h1 { font-size: 1.3rem; }
  .post-item { flex-direction: column; gap: 0.15rem; padding: 0.6rem 0.75rem; }
  .post-date { font-size: 0.72rem; }
  .post-header h1 { font-size: 1.3rem; }
}