:root {
  --bg: #08111d;
  --bg-elev: #0f172a;
  --panel: #111827;
  --panel-soft: #162233;
  --text: #edf2ff;
  --muted: #a7b7d1;
  --soft: #dfe7f7;
  --accent: #7dd3fc;
  --accent-strong: #60a5fa;
  --accent-2: #34d399;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: rgba(2, 6, 23, 0.35);
  --code-bg: rgba(15, 23, 42, 0.9);
}

html[data-theme="light"] {
  --bg: #f9fafb;
  --bg-elev: #ffffff;
  --panel: #f3f4f6;
  --panel-soft: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --soft: #374151;
  --accent: #0891b2;
  --accent-strong: #0369a1;
  --accent-2: #059669;
  --border: rgba(209, 213, 219, 0.5);
  --shadow: rgba(0, 0, 0, 0.1);
  --code-bg: rgba(243, 244, 246, 0.9);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #060d19 0%, #0a1220 100%);
  color: var(--text);
  line-height: 1.7;
  transition: background-color 0.3s, color 0.3s;
}

html[data-theme="light"] body {
  background: linear-gradient(180deg, #f5f7fa 0%, #e8eaef 100%);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px 80px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 26px;
}

.brand {
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 800;
  color: var(--accent-2);
  display: flex;
  align-items: center;
}

.brand img {
  height: 48px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 22px;
  align-items: center;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  background: var(--panel);
  color: var(--accent);
  border-color: var(--accent);
}

.hero {
  padding: 40px 0 30px;
}

.hero-inner {
  background: linear-gradient(135deg, rgba(96,165,250,0.12), rgba(52,211,153,0.08));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 40px 30px;
  box-shadow: 0 18px 45px var(--shadow);
}

.hero-tag {
  display: inline-block;
  background: rgba(125, 211, 252, 0.12);
  border: 1px solid rgba(125, 211, 252, 0.2);
  color: var(--accent);
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 720px;
  font-size: 1.15rem;
  color: var(--soft);
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
}

.button.primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #07131d;
  border-color: transparent;
}

.section {
  margin-top: 42px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 12px;
  margin-bottom: 18px;
}

.section-header h2 {
  margin: 0;
  font-size: 1.75rem;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: rgba(17, 24, 39, 0.88);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 8px 24px rgba(2, 6, 23, 0.18);
}

.card h3 {
  margin-top: 0;
  font-size: 1.3rem;
}

.card h3 a {
  color: inherit;
}

.card h3 a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
}

.featured {
  margin-top: 44px;
}

.featured-panel {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  background: rgba(17, 24, 39, 0.88);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px;
}

.featured-copy h3 {
  margin: 0 0 12px;
  font-size: clamp(1.9rem, 3vw, 2.6rem);
}

.featured-copy h3 a {
  color: inherit;
}

.featured-copy h3 a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.featured-copy p {
  color: var(--muted);
  margin-bottom: 18px;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-list li + li {
  margin-top: 18px;
}

.post-card {
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 16px;
}

.post-card .date {
  display: inline-block;
  color: var(--accent);
  font-size: 0.76rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 7px;
}

.post-card h4 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.post-card p {
  margin: 0 0 14px;
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  background: rgba(125, 211, 252, 0.12);
  color: var(--accent);
  padding: 5px 9px;
  border-radius: 999px;
  font-size: 0.76rem;
  border: 1px solid rgba(125, 211, 252, 0.18);
}

.about {
  margin-top: 52px;
  color: var(--soft);
}

.footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
}

.article-shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 26px 18px 60px;
}

.article-body {
  background: rgba(17, 24, 39, 0.88);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 34px 32px 42px;
  box-shadow: 0 16px 40px var(--shadow);
}

.article-body h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin-bottom: 12px;
}

.article-body h2 {
  margin-top: 2.1em;
  margin-bottom: 0.8em;
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
}

.article-body h3 {
  margin-top: 1.7em;
  margin-bottom: 0.7em;
  font-size: 1.28rem;
}

.article-body p,
.article-body li {
  color: var(--soft);
  font-size: 1.06rem;
}

.article-body blockquote {
  margin: 1.6em 0;
  padding: 0.9em 1em 0.9em 1.2em;
  border-left: 4px solid var(--accent-2);
  background: rgba(52, 211, 153, 0.06);
  color: var(--text);
}

.article-body code, .article-body pre {
  font-family: Consolas, "Courier New", monospace;
}

.article-body pre {
  background: var(--code-bg);
  color: #dbeafe;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
  padding: 1rem 1.1rem;
  line-height: 1.6;
}

.article-body code {
  background: rgba(96, 165, 250, 0.12);
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  border: 1px solid rgba(96, 165, 250, 0.15);
}

.article-body ul,
.article-body ol {
  padding-left: 1.4rem;
}

.article-body .article-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.article-body .back-link {
  display: inline-block;
  margin-bottom: 18px;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin: 1.6em 0;
  display: block;
  box-shadow: 0 8px 24px var(--shadow);
}

.article-body .image-caption {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: -1.2em;
  margin-bottom: 1.6em;
  font-style: italic;
}

/* Comments Section */
.comments-section {
  margin-top: 3.5em;
  padding-top: 2.4em;
  border-top: 2px solid var(--border);
}

.comments-section h2 {
  font-size: 1.8rem;
  margin-top: 0;
  margin-bottom: 0.4em;
}

.comments-intro {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2em;
}

.comment-form-wrapper {
  background: rgba(22, 34, 51, 0.6);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 3em;
}

.comment-form-wrapper h3 {
  margin-top: 0;
  margin-bottom: 1.2em;
  font-size: 1.25rem;
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 1.2em;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
}

.form-group label {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(125, 211, 252, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.submit-button {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #07131d;
  border: none;
  border-radius: 10px;
  padding: 12px 20px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.submit-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(96, 165, 250, 0.3);
}

.submit-button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-note {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

.comments-list {
  margin-top: 3em;
}

.comments-list h3 {
  font-size: 1.25rem;
  margin-bottom: 1.5em;
}

.comment-item {
  background: rgba(22, 34, 51, 0.5);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 1.2em;
}

.comment-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.8em;
}

.comment-author {
  font-weight: 600;
  color: var(--text);
}

.comment-date {
  color: var(--muted);
  font-size: 0.85rem;
}

.comment-text {
  color: var(--soft);
  line-height: 1.6;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.no-comments {
  text-align: center;
  padding: 2em 0;
  color: var(--muted);
}

.no-comments p {
  margin: 0;
}

@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .featured-panel {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    padding: 26px 20px;
  }

  .article-body {
    padding: 24px 20px 28px;
  }
}