:root {
  --bg: #f6f8fb;
  --fg: #142033;
  --muted: #667085;
  --accent: #2d7dd2;
  --accent-strong: #0b2447;
  --accent-soft: #eaf4ff;
  --border: #dce3ec;
  --card: #ffffff;
  --card-raised: #ffffff;
  --code-bg: #eef3f8;
  --danger: #c43d32;
  --max: 72rem;
  --shadow: 0 18px 45px rgba(20, 32, 51, 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
}
html {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(45, 125, 210, 0.16), transparent 34rem),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 24rem);
  color: var(--fg);
}
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem;
}

a {
  color: var(--accent);
}
a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--card);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  font-size: 1.15rem;
  letter-spacing: 0;
}
.brand img {
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
}
.site-header nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
}
.site-header nav a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 650;
  font-size: 0.95rem;
  opacity: 0.82;
}
.site-header nav a:hover {
  color: var(--accent-strong);
  opacity: 1;
}
.lang-switch {
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.8rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 1.5rem 0;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.75);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
}
.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.card {
  background: var(--card-raised);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.15rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 2px rgba(20, 32, 51, 0.04);
}
.card h2 {
  margin-top: 0;
}
.tag {
  display: inline-block;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-size: 0.8rem;
  margin: 0.15rem 0.15rem 0.15rem 0;
  text-decoration: none;
}
.tag:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 1px solid var(--accent);
  border-radius: 0.45rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-weight: 700;
  padding: 0.55rem 0.8rem;
}

button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: white;
  color: var(--fg);
  padding: 0.55rem 0.65rem;
}

textarea {
  resize: vertical;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lead {
  color: #344054;
  font-size: 1.15rem;
  max-width: 46rem;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  gap: 2rem;
  align-items: center;
  padding: 2.25rem 0 2rem;
}

.home-hero h1,
.about-page h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero-mark {
  width: min(15rem, 42vw);
  justify-self: end;
  filter: drop-shadow(0 22px 30px rgba(45, 125, 210, 0.22));
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 1rem 0;
}

article.post h1 {
  margin-bottom: 0.25rem;
}
.post-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.post-image {
  margin: 1.5rem 0;
}
.post-image img {
  max-width: 100%;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
}
.post-image .caption {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

pre {
  background: var(--code-bg);
  padding: 0.85rem;
  border-radius: 0.5rem;
  overflow-x: auto;
}
code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-size: 0.9em;
}

.sources {
  border-left: 4px solid var(--accent);
  padding: 0.5rem 1rem;
  background: var(--card);
  border-radius: 0 0.5rem 0.5rem 0;
  margin-top: 2rem;
}

.chat-container {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  background: var(--card);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.chat-log {
  min-height: 12rem;
  max-height: 24rem;
  overflow-y: auto;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: 0.45rem;
}
.chat-form {
  display: flex;
  gap: 0.5rem;
}
.chat-form input {
  flex: 1;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--fg);
}
.chat-form button {
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 0.45rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
}
.chat-form button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.chat-msg {
  margin: 0.5rem 0;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
}
.chat-msg.user {
  background: rgba(45, 125, 210, 0.1);
}
.chat-msg.assistant {
  background: transparent;
  border-left: 3px solid var(--accent);
  padding-left: 0.75rem;
}

.about-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 22rem);
  gap: 2rem;
  align-items: start;
  padding: 2.5rem 0;
}

.about-copy {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.rich-copy p {
  margin: 0 0 1rem;
}

.about-portrait {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.about-portrait img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.45rem;
  background: var(--accent-soft);
}

.about-portrait div {
  display: grid;
  gap: 0.2rem;
  margin-top: 0.8rem;
}

.about-portrait span {
  color: var(--muted);
}

.admin-panel,
.draft-dialog {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.draft-dialog {
  color: var(--fg);
}

.draft-dialog::backdrop {
  background: rgba(20, 32, 51, 0.45);
  backdrop-filter: blur(4px);
}

.preview-dialog {
  width: min(72rem, 94vw);
  height: min(52rem, 92vh);
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--card);
  color: var(--fg);
  box-shadow: var(--shadow);
}

.preview-dialog::backdrop {
  background: rgba(20, 32, 51, 0.5);
  backdrop-filter: blur(4px);
}

.preview-dialog iframe {
  width: 100%;
  height: calc(100% - 4.5rem);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: white;
}

.image-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.admin-image-preview {
  margin: 0.75rem 0 0;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--accent-soft);
}

.admin-image-preview img {
  display: block;
  width: min(100%, 42rem);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.45rem;
  border: 1px solid rgba(11, 36, 71, 0.12);
  background: white;
}

.admin-image-preview figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.dlg-actions button.danger,
button.danger {
  background: var(--danger);
  border-color: var(--danger);
}

.about-admin-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.span-2 {
  grid-column: 1 / -1;
}

.about-preview {
  align-self: end;
}

.about-preview img {
  width: 7rem;
  height: 7rem;
  border-radius: 0.5rem;
  object-fit: cover;
  border: 1px solid var(--border);
  background: var(--accent-soft);
}

.hint {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .header-inner,
  .footer-inner,
  .home-hero,
  .about-page,
  .about-admin-grid {
    grid-template-columns: 1fr;
  }

  .header-inner {
    align-items: flex-start;
  }

  .site-header nav ul {
    flex-wrap: wrap;
  }

  .hero-mark {
    justify-self: start;
    width: 9rem;
  }
}