:root {
  color-scheme: dark;
  --bg: #1f1e1d;
  --bg-2: #262624;
  --surface: rgba(255, 255, 255, 0.055);
  --surface-strong: rgba(255, 255, 255, 0.1);
  --surface-solid: #2b2a28;
  --border: rgba(255, 255, 255, 0.11);
  --border-strong: rgba(255, 255, 255, 0.2);
  --text: #f4f1ea;
  --muted: #c4c0b6;
  --muted-2: #928f86;
  --accent: #d97757;
  --accent-strong: #e08a6c;
  --accent-soft: rgba(217, 119, 87, 0.16);
  --success: #7dd3c7;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  --shadow-soft: 0 14px 36px rgba(0, 0, 0, 0.32);
  --radius-card: 28px;
  --radius-control: 16px;
  --radius-chip: 999px;
  --max-width: 1120px;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f4ed;
  --bg-2: #fffaf1;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --surface-solid: #ffffff;
  --border: rgba(75, 62, 42, 0.16);
  --border-strong: rgba(75, 62, 42, 0.28);
  --text: #211b13;
  --muted: #685c4c;
  --muted-2: #8a7d6a;
  --accent: #8f5f1f;
  --accent-strong: #6f4614;
  --accent-soft: rgba(143, 95, 31, 0.12);
  --success: #0f766e;
  --shadow: 0 24px 70px rgba(70, 54, 27, 0.12);
  --shadow-soft: 0 12px 30px rgba(70, 54, 27, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 25rem),
    radial-gradient(circle at 84% 12%, rgba(125, 211, 199, 0.16), transparent 30rem),
    linear-gradient(145deg, var(--bg), var(--bg-2));
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

:root body,
[data-theme="dark"] body {
  background:
    radial-gradient(circle at 15% 10%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 26rem),
    radial-gradient(circle at 84% 12%, rgba(217, 119, 87, 0.1), transparent 30rem),
    linear-gradient(145deg, var(--bg), var(--bg-2));
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

:focus-visible { outline: 2px solid var(--accent-strong); outline-offset: 3px; }

.content-wrap {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(22px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 70px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 1;
  min-width: 0;
}
.nav-brand img.nav-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 14px;
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--border-strong);
}
.nav-brand strong { font-size: 0.98rem; letter-spacing: -0.03em; }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link {
  padding: 0.55rem 0.7rem;
  border-radius: var(--radius-control);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}
.nav-link:hover,
.nav-link.is-active {
  color: var(--text);
  background: var(--surface);
}
.theme-toggle {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-soft);
}
.theme-toggle .moon-icon { display: none; }
[data-theme="light"] .theme-toggle .sun-icon { display: none; }
[data-theme="light"] .theme-toggle .moon-icon { display: inline; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
}
.hamburger span { display: block; width: 100%; height: 2px; border-radius: 999px; background: var(--text); }

/* Hero */
.hero-section { padding: 3rem 0 1.5rem; }
.hero-title {
  margin: 0 0 0.5rem;
  font-family: Geist, Inter, sans-serif;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  letter-spacing: -0.06em;
  line-height: 0.95;
}
.hero-description {
  margin: 0 auto;
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

/* Blog grid */
.section { padding: 1.5rem 0 4rem; }
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.4rem;
}
.blog-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: color-mix(in srgb, var(--surface-solid) 88%, transparent);
  box-shadow: var(--shadow-soft);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.blog-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  box-shadow: var(--shadow);
}
.blog-card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
}
.blog-card-content { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.2rem; flex: 1; }
.blog-date {
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.blog-title { margin: 0; font-size: 1.2rem; letter-spacing: -0.02em; line-height: 1.2; }
.blog-excerpt { margin: 0; color: var(--muted); font-size: 0.94rem; }
.blog-read-more {
  margin-top: auto;
  padding-top: 0.4rem;
  color: var(--accent-strong);
  font-weight: 800;
  font-size: 0.9rem;
}
.loading-message,
.error-message { color: var(--muted); padding: 1rem 0; }

/* Post page */
.post-container {
  margin: 0 auto;
  max-width: 760px;
  padding: clamp(1.4rem, 3vw, 2.8rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: color-mix(in srgb, var(--surface-solid) 92%, transparent);
  box-shadow: var(--shadow);
}
.post-header { padding-bottom: 1.2rem; margin-bottom: 1.6rem; border-bottom: 1px solid var(--border); }
.post-title {
  margin: 0 0 0.6rem;
  font-family: Geist, Inter, sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
}
.post-meta { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; color: var(--muted-2); font-size: 0.88rem; font-weight: 700; }
.post-body { color: var(--text); font-size: 1.04rem; overflow-wrap: anywhere; word-break: break-word; }
.post-body h1, .post-body h2, .post-body h3, .post-body h4 {
  font-family: Geist, Inter, sans-serif;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 1.8rem 0 0.7rem;
}
.post-body h1 { font-size: 1.7rem; }
.post-body h2 { font-size: 1.4rem; }
.post-body h3 { font-size: 1.15rem; }
.post-body p { margin: 0 0 1.1rem; }
.post-body ul, .post-body ol { margin: 0 0 1.1rem; padding-left: 1.4rem; display: grid; gap: 0.4rem; }
.post-body li::marker { color: var(--accent-strong); }
.post-body a { color: var(--accent-strong); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.post-body img { margin: 1.2rem 0; border-radius: 16px; border: 1px solid var(--border); }
.post-body blockquote {
  margin: 1.2rem 0;
  padding: 0.6rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 12px 12px 0;
  color: var(--muted);
}
.post-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: var(--surface-strong);
}
.post-body pre {
  margin: 1.2rem 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-solid);
}
.post-body pre code { padding: 0; background: none; }
.post-body table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: 0.94rem; }
.post-body th, .post-body td { padding: 0.55rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border); }
.post-body thead th { background: var(--accent-soft); font-weight: 800; }
.post-footer { margin-top: 2rem; padding-top: 1.2rem; border-top: 1px solid var(--border); }
.back-to-blog { color: var(--accent-strong); font-weight: 800; }

/* Footer */
.footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  border-top: 1px solid var(--border);
}
.footer p { margin: 0; }

@media (max-width: 760px) {
  .hamburger { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 0.6rem;
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(22px);
  }
  .nav-menu.open { display: flex; }
  .nav-menu .theme-toggle { width: 100%; border-radius: var(--radius-control); }
  .blog-grid { grid-template-columns: 1fr; }
}