/* ==========================================================================
   HARSHA MATTA — PERSONAL PORTFOLIO
   Design System: Minimal, Content-First, Obsidian Dark, Single Accent
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette (Deep Obsidian + Single Celestial Sky Accent) */
  --bg-canvas: #0c0d0e;
  --bg-surface: #141618;
  --bg-surface-elevated: #1b1e22;
  --bg-surface-hover: #21252b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --border-focus: rgba(56, 189, 248, 0.6);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent: #38bdf8;
  --accent-tint: rgba(56, 189, 248, 0.12);
  --accent-hover: #7dd3fc;

  /* Typography */
  --font-serif: "Newsreader", Georgia, Cambria, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* Radii & Measures */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 9999px;

  --measure-prose: 65ch;
  --transition-fast: 0.15s ease;
}

/* --------------------------------------------------------------------------
   2. Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent-tint);
  color: var(--accent);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

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

/* --------------------------------------------------------------------------
   3. Main Page Grid (Brittany Chiang Inspired 2-Column Layout)
   -------------------------------------------------------------------------- */
.page-wrapper {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  gap: 4rem;
  min-height: 100vh;
}

/* Left Column: Sticky Identity & Nav Sidebar */
.sidebar {
  width: 42%;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 5rem 0;
}

.sidebar-top {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 2.85rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1.4;
}

.brand-bio {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 38ch;
}

/* Sidebar Navigation */
.sidebar-nav {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0.4rem 0;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-indicator {
  display: block;
  width: 24px;
  height: 1px;
  background-color: var(--text-muted);
  transition: width 0.2s ease, background-color 0.2s ease;
}

.nav-item:hover {
  color: var(--text-primary);
}

.nav-item:hover .nav-indicator {
  width: 48px;
  background-color: var(--text-primary);
}

.nav-item.active {
  color: var(--accent);
}

.nav-item.active .nav-indicator {
  width: 56px;
  background-color: var(--accent);
}

/* Sidebar Footer / Social Links */
.sidebar-socials {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0.35rem 0;
  transition: color var(--transition-fast);
}

.social-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.social-link:hover {
  color: var(--accent);
}

.resume-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.resume-badge:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Right Column: Scrollable Content Stream */
.content-stream {
  width: 54%;
  padding: 5rem 0;
  display: flex;
  flex-direction: column;
  gap: 6rem;
}

/* --------------------------------------------------------------------------
   4. Section Headers & Typography
   -------------------------------------------------------------------------- */
.section {
  scroll-margin-top: 5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.section-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.section-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.prose-block {
  max-width: var(--measure-prose);
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.prose-block strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   5. Projects Section (Clean Cards, Hairline Borders, Real Screenshots)
   -------------------------------------------------------------------------- */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.project-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.project-title-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.project-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  object-fit: cover;
  flex-shrink: 0;
}

.project-icon-placeholder {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.project-name {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.project-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  display: block;
  margin-top: 0.1rem;
}

.project-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-link.primary {
  background: var(--accent-tint);
  border-color: rgba(56, 189, 248, 0.4);
  color: var(--accent);
}

.btn-link.primary:hover {
  background: var(--accent);
  color: #0c0d0e;
  font-weight: 600;
}

.project-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: var(--measure-prose);
}

/* Screenshot Strip / Gallery */
.gallery-strip {
  display: flex;
  gap: 0.85rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-subtle) transparent;
}

.screenshot-thumb {
  flex: 0 0 115px;
  aspect-ratio: 9 / 19.5;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  background: #000;
  cursor: zoom-in;
  transition: border-color var(--transition-fast), opacity var(--transition-fast);
}

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

.screenshot-thumb:hover {
  border-color: var(--accent);
  opacity: 0.9;
}

/* Diagram Preview Frame (deal.II) */
.diagram-frame {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  background: #121417;
  cursor: zoom-in;
  transition: border-color var(--transition-fast);
}

.diagram-frame svg, .diagram-frame img {
  width: 100%;
  height: auto;
  display: block;
}

.diagram-frame:hover {
  border-color: var(--accent);
}

/* Tech Tags */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.25rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.metric-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   6. Quant Research & Interactive Tools Section
   -------------------------------------------------------------------------- */
.quant-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.quant-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.quant-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

.quant-preview-link {
  display: block;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  background: #0e1117;
  transition: border-color var(--transition-fast);
}

.quant-preview-link:hover {
  border-color: var(--accent);
}

.quant-preview-link img, .quant-preview-link svg {
  width: 100%;
  height: auto;
}

/* --------------------------------------------------------------------------
   7. Technical Writing Section (16:9 Link Previews)
   -------------------------------------------------------------------------- */
.writing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

.article-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.article-thumbnail-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #101215;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.article-thumbnail-frame img, .article-thumbnail-frame svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity var(--transition-fast);
}

.article-card:hover .article-thumbnail-frame img {
  opacity: 0.92;
}

.article-content {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.article-topic {
  color: var(--accent);
}

.article-title {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title {
  color: var(--accent);
}

.article-hook {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: var(--measure-prose);
}

.article-footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  transition: color var(--transition-fast);
}

.article-card:hover .article-footer-cta {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   8. Leadership & Governance Section
   -------------------------------------------------------------------------- */
.leadership-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.leadership-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color var(--transition-fast);
}

.leadership-item:hover {
  border-color: var(--border-hover);
}

.leadership-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.leadership-role {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.leadership-org {
  font-size: 0.88rem;
  color: var(--accent);
  margin-top: 0.1rem;
}

.leadership-time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.leadership-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: var(--measure-prose);
}

/* --------------------------------------------------------------------------
   9. Education & Technical Inventory Section
   -------------------------------------------------------------------------- */
.education-block {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.education-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.edu-institution {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.edu-degree {
  font-size: 0.95rem;
  color: var(--accent);
  margin-top: 0.15rem;
}

.edu-timeline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.coursework-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.85rem;
}

.coursework-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.coursework-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.course-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.skills-inventory {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.skill-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.skill-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   10. Contact & Footer
   -------------------------------------------------------------------------- */
.contact-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. Lightbox Modal
   -------------------------------------------------------------------------- */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(12, 13, 14, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  justify-content: center;
  align-items: center;
  padding: 2rem;
  cursor: zoom-out;
}

.lightbox-modal.active {
  display: flex;
  animation: fadeIn 0.15s ease-out;
}

.lightbox-img-wrapper {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 88vh;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  object-fit: contain;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

/* --------------------------------------------------------------------------
   12. Responsive Breakpoints (Seamless Mobile & Tablet Stack)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .page-wrapper {
    flex-direction: column;
    gap: 3rem;
    padding: 0 1.5rem;
  }

  .sidebar {
    width: 100%;
    position: relative;
    height: auto;
    padding: 3.5rem 0 1.5rem;
  }

  .brand-name {
    font-size: 2.25rem;
  }

  .sidebar-nav {
    display: none; /* Mobile visitors scroll naturally */
  }

  .content-stream {
    width: 100%;
    padding: 0 0 4rem;
    gap: 4rem;
  }

  .screenshot-thumb {
    flex: 0 0 100px;
  }
}

@media (max-width: 640px) {
  .project-header, .leadership-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .project-actions {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

/* --------------------------------------------------------------------------
   13. Subpage Compatibility Utilities (e.g. /paatam/)
   -------------------------------------------------------------------------- */
:root {
  --border-color: var(--border-subtle);
  --surface-color: var(--bg-surface);
  --surface-raised: var(--bg-surface-elevated);
  --accent-color: var(--accent);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 0;
  background: rgba(12, 13, 14, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.brand-logo:hover {
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-btn {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: #0c0d0e;
  font-weight: 600;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0c0d0e;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.badge-published {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
}

.tags-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tags-inline span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.edu-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.section-block {
  margin: 3.5rem 0;
}

.section-header {
  margin-bottom: 1.25rem;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}