/* Base reset, typography, layout. Token vars inlined in <style id="grove-tokens">. */

/* === Reset === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-body);
  font-size: var(--font-base);
  line-height: var(--line-height);
  color: var(--color-text-resolved);
  background: var(--color-bg-resolved);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Prevent horizontal scroll from full-bleed pseudo-elements (100vw hero). */
body { overflow-x: clip; }

/* === Accessibility === */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 9999;
}

.skip-link:focus {
  position: fixed;
  top: 0;
  left: 0;
  width: auto;
  height: auto;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent-resolved);
  color: #fff;
  font-weight: var(--weight-heading);
  text-decoration: none;
  z-index: 9999;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* === Focus === */
:focus-visible {
  outline: 2px solid var(--color-accent-resolved);
  outline-offset: 2px;
}

/* === Layout === */
main {
  max-width: var(--space-content-width);
  margin: 0 auto;
  padding: var(--space-xl);
}

/* Programmatic focus (a11y.focusMain) — no visible ring on non-interactive containers. */
main:focus-visible { outline: none; }

/* === Typography — vertical rhythm ===
 * Baseline: line-height 1.7 × 16px ≈ 27px. Heading margin-top creates the
 * pause between a paragraph and the next section; margin-bottom tightens the
 * heading to its own content. Adjacent siblings (heading + first content)
 * should feel like one unit; unrelated blocks (paragraph + heading) should
 * breathe.
 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-text-resolved);
}

h1 {
  font-size: calc(var(--font-base) * var(--scale-xxl));
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

h2 {
  font-size: calc(var(--font-base) * var(--scale-xl));
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.005em;
}

h3 {
  font-size: calc(var(--font-base) * var(--scale-lg));
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: calc(var(--font-base) * 1.1);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

h5 {
  font-size: calc(var(--font-base) * 0.82);
  margin-top: var(--space-md);
  margin-bottom: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--color-text-secondary-resolved);
}

h6 {
  font-size: calc(var(--font-base) * 0.75);
  margin-top: var(--space-md);
  margin-bottom: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--color-text-secondary-resolved);
}

p { margin-bottom: var(--space-md); }

a {
  color: var(--color-accent-resolved);
  transition: color 150ms ease-out, opacity 150ms ease-out;
}
a:hover { text-decoration: none; }

/* Lists — reset stripped default padding. Restore and tune indentation. */
ol, ul {
  margin: 0 0 var(--space-md);
  padding-left: 1.75rem;
}

ol li, ul li {
  margin-bottom: 0.25rem;
  padding-left: 0.25rem;
}

ol li::marker {
  color: var(--color-text-secondary-resolved);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

ul li::marker {
  color: var(--color-accent-resolved);
}

/* Nested lists tighten */
li > ol, li > ul {
  margin: 0.25rem 0 0.5rem;
}

/* Heading immediately followed by list: tighten */
h2 + ol, h2 + ul,
h3 + ol, h3 + ul,
h4 + ol, h4 + ul {
  margin-top: 0;
}

/* === Inline + block code === */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-code-bg-resolved);
  padding: 0.12em 0.35em;
  border-radius: 3px;
  color: var(--color-text-resolved);
}

pre {
  background: var(--color-code-bg-resolved);
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  margin: var(--space-md) 0 var(--space-lg);
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.55;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

img { max-width: 100%; height: auto; }

/* === Blockquote === */
blockquote {
  border-left: 3px solid;
  border-image: linear-gradient(180deg, var(--color-accent-resolved), var(--color-gradient-end-resolved)) 1;
  padding: 0.25rem 0 0.25rem var(--space-lg);
  margin: var(--space-lg) 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: calc(var(--font-base) * 1.18);
  line-height: 1.5;
  color: var(--color-text-resolved);
}

blockquote p { margin-bottom: 0.5rem; }
blockquote p:last-child { margin-bottom: 0; }

/* === Section Divider === */
hr {
  border: none;
  height: 1px;
  max-width: 200px;
  margin: var(--space-xxl) auto;
  background: linear-gradient(90deg, transparent 0%, var(--color-accent-resolved) 50%, transparent 100%);
}

/* === Feed Grid === */
.feed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

/* === Card === */
.card {
  background: var(--color-card-bg-resolved);
  border: 1px solid var(--color-border-resolved);
  border-radius: 6px;
  padding: var(--space-card-padding);
  position: relative;
  transition: box-shadow 200ms ease-out, transform 200ms ease-out;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-1px);
}

.card-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  text-decoration: none;
  color: inherit;
}

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

.card time {
  font-size: calc(var(--font-base) * var(--scale-sm));
  color: var(--color-text-secondary-resolved);
}

.card-title {
  font-size: calc(var(--font-base) * var(--scale-lg));
  font-weight: var(--weight-heading);
  transition: color 150ms ease-out;
  margin: 0;
}

.card-excerpt {
  font-size: var(--font-base);
  color: var(--color-text-secondary-resolved);
  margin: 0;
}

/* === Post hero === */
/*
 * Hero header spans full viewport width via a pseudo-element that breaks out
 * of main's max-width. The inner content stays aligned to the content column.
 */
.article-layout { position: relative; }

/* Pull hero flush against header by eating main's top padding. */
main:has(.article-layout) { padding-top: 0; }

.post-hero {
  position: relative;
  padding: var(--space-xxl) 0 calc(var(--space-xxl) + var(--space-sm));
  margin: 0 0 var(--space-lg);
  text-align: center;
  color: #fff;
  isolation: isolate;
  outline: none;
}

.post-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  left: calc(50% - 50vw);
  width: 100vw;
  background: linear-gradient(
    135deg,
    var(--color-gradient-start-resolved) 0%,
    var(--color-gradient-end-resolved) 100%
  );
  z-index: -1;
}

.post-hero-inner {
  max-width: var(--space-content-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.post-hero h1 {
  color: inherit;
  font-size: calc(var(--font-base) * var(--scale-xxl) * 1.2);
  margin: 0 0 var(--space-sm);
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.post-hero time {
  display: block;
  color: inherit;
  opacity: 0.85;
  font-size: calc(var(--font-base) * var(--scale-md));
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.post-body {
  line-height: var(--line-height);
}

/* First heading in body has no top margin — the hero already spaced it. */
.post-body > h1:first-child,
.post-body > h2:first-child,
.post-body > h3:first-child {
  margin-top: 0;
}

/* === Figure with caption === */
figure {
  margin: var(--space-xl) 0;
  text-align: center;
}

figure img,
figure svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

figure.arch-diagram {
  padding: var(--space-lg);
  background: var(--color-surface-resolved);
  border-radius: 8px;
  border: 1px solid var(--color-border-resolved);
}

figcaption {
  margin-top: var(--space-sm);
  font-size: calc(var(--font-base) * var(--scale-sm));
  font-style: italic;
  color: var(--color-text-secondary-resolved);
}

/* === Figure alignment conventions === */
figure.align-right {
  float: right;
  margin: 0 0 var(--space-md) var(--space-lg);
  max-width: 50%;
  text-align: right;
}

figure.align-left {
  float: left;
  margin: 0 var(--space-lg) var(--space-md) 0;
  max-width: 50%;
  text-align: left;
}

figure.align-center {
  margin-left: auto;
  margin-right: auto;
}

figure picture {
  display: block;
}

figure picture img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

@media (max-width: 480px) {
  figure.align-right,
  figure.align-left {
    float: none;
    max-width: 100%;
    margin: var(--space-xl) 0;
    text-align: center;
  }
}

/* === Site Header === */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  max-width: var(--space-content-width);
  margin: 0 auto;
  gap: var(--space-md);
}

.site-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: calc(var(--font-base) * var(--scale-lg));
  text-decoration: none;
  color: var(--color-text-resolved);
  letter-spacing: -0.01em;
}

.header-actions {
  align-items: center;
  display: flex;
  gap: var(--space-sm);
}

/* === Site Footer === */
.site-footer {
  margin-top: var(--space-xxl);
  padding: var(--space-lg) var(--space-xl);
  max-width: var(--space-content-width);
  margin-left: auto;
  margin-right: auto;
}

.site-footer::before {
  content: '';
  display: block;
  height: 1px;
  max-width: 200px;
  margin: 0 auto var(--space-lg);
  background: linear-gradient(90deg, transparent 0%, var(--color-accent-resolved) 50%, transparent 100%);
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: calc(var(--font-base) * var(--scale-sm));
  color: var(--color-text-secondary-resolved);
}

.build-id {
  margin-left: auto;
  font-size: 0.65rem;
  opacity: 0.4;
  font-family: monospace;
}

/* === Search Overlay ===
 * Native <dialog> opened with showModal(). The browser handles Escape,
 * focus trap, and places it in the top layer — no z-index needed. */
.search-overlay {
  padding: 0;
  border: none;
  background: transparent;
  max-width: none;
  max-height: none;
  margin: 10vh auto auto;
}

.search-overlay::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.search-panel {
  background: var(--color-bg-resolved);
  border-radius: 8px;
  width: min(90vw, 600px);
  max-height: 70vh;
  overflow-y: auto;
  padding: var(--space-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.search-panel input {
  width: 100%;
  padding: 0.75rem;
  font-size: var(--font-base);
  border: 1px solid var(--color-border-resolved);
  border-radius: 4px;
  font-family: inherit;
  background: var(--color-surface-resolved);
  color: var(--color-text-resolved);
  transition: border-color 150ms ease;
}

.search-panel input:focus {
  border-color: var(--color-accent-resolved);
}

.search-results { margin-top: var(--space-md); color: var(--color-text-secondary-resolved); }

.search-panel input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: currentColor;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 4l8 8M12 4l-8 8' stroke='white' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 4l8 8M12 4l-8 8' stroke='white' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat;
  opacity: 0.7;
  cursor: pointer;
}

.search-result {
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-border-resolved);
  border-radius: 4px;
  cursor: pointer;
}

.search-result[aria-selected="true"] {
  background: var(--color-accent-resolved);
  color: #fff;
}

.search-result[aria-selected="true"] a,
.search-result[aria-selected="true"] .excerpt {
  color: #fff;
}

.search-result a {
  font-weight: var(--weight-heading);
  text-decoration: none;
}

.search-result .excerpt {
  font-size: calc(var(--font-base) * var(--scale-sm));
  color: var(--color-text-secondary-resolved);
  margin-top: var(--space-xs);
}

/* === Encryption Gate === */

/* Gate layout hides shell chrome until unlocked */
body[data-layout="gate"] .site-header,
body[data-layout="gate"] .site-footer,
body[data-layout="gate"] .skip-link {
  display: none;
}

#grove-gate {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.gate-subtitle {
  color: var(--color-text-secondary-resolved);
  margin: var(--space-sm) 0 var(--space-lg);
}

.gate-form {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-sm);
  width: 100%;
  max-width: 24rem;
}

.gate-form .el-input-group {
  margin-bottom: 0;
}

.gate-error {
  font-size: calc(var(--font-base) * var(--scale-sm));
  min-height: 1.2em;
  text-align: center;
  margin: 0;
  visibility: hidden;
}

.gate-error--visible {
  visibility: visible;
  color: var(--color-banner-error-text-resolved, #dc2626);
}

/* === TOC Sidebar === */
.toc-sidebar {
  position: sticky;
  top: var(--space-xl);
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  font-size: calc(var(--font-base) * var(--scale-sm));
}

.toc-sidebar ol {
  list-style: none;
  padding-left: 0;
}

.toc-sidebar li[data-level="3"] { padding-left: var(--space-md); }
.toc-sidebar li[data-level="4"] { padding-left: var(--space-xl); }
.toc-sidebar li[data-level="5"] { padding-left: var(--space-xxl); }

.toc-sidebar a {
  display: block;
  padding: var(--space-xs) 0;
  text-decoration: none;
  color: var(--color-text-secondary-resolved);
}

.toc-sidebar a.active {
  color: var(--color-accent-resolved);
  font-weight: var(--weight-heading);
}

/* === Reading Progress === */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-resolved), var(--color-gradient-end-resolved));
  z-index: 999;
  width: 0;
  transition: width 100ms;
}

/* === Responsive === */
@media (max-width: 640px) {
  .feed-grid { grid-template-columns: 1fr; }
  main { padding: var(--space-md); }
  .feed-grid { gap: var(--space-md); }
  .site-header {
    padding: 0.75rem var(--space-md);
  }
  .toc-sidebar { display: none; }
  .post-hero h1 {
    font-size: calc(var(--font-base) * var(--scale-xxl));
  }
}

/* === Reduced motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}