:root {
  --surface: #fbfaf7;
  --surface-2: #ffffff;
  --surface-3: #f3f1ec;
  --ink: #1d1c1a;
  --ink-2: #5c5852;
  --muted: #8a857d;
  --border: rgba(29, 28, 26, 0.12);
  --border-strong: rgba(29, 28, 26, 0.22);
  --accent: #1d1c1a;
  --accent-ink: #fbfaf7;
  --focus: #2f6feb;
  --status-error: #9f2f2d;
  --type-html-bg: #e8effa;
  --type-html-ink: #2b5b8f;
  --type-md-bg: #edf3ec;
  --type-md-ink: #346538;
  --type-image-bg: #fbf3db;
  --type-image-ink: #8a6200;
  --type-pdf-bg: #fdebec;
  --type-pdf-ink: #9f2f2d;
  --type-other-bg: #f0eeea;
  --type-other-ink: #5c5852;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --font-sans: "Segoe UI", "SF Pro Text", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-display: Georgia, "Noto Serif SC", "Songti SC", serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface: #141312;
    --surface-2: #1b1a18;
    --surface-3: #232220;
    --ink: #f2efe9;
    --ink-2: #b3ada4;
    --muted: #7d786f;
    --border: rgba(242, 239, 233, 0.12);
    --border-strong: rgba(242, 239, 233, 0.22);
    --accent: #f2efe9;
    --accent-ink: #141312;
    --focus: #6ea0ff;
    --status-error: #eaa6a2;
    --type-html-bg: #1b2a3b;
    --type-html-ink: #9dc3ef;
    --type-md-bg: #1e2a1f;
    --type-md-ink: #a8ceaa;
    --type-image-bg: #2e2716;
    --type-image-ink: #e3c27a;
    --type-pdf-bg: #33201f;
    --type-pdf-ink: #eaa6a2;
    --type-other-bg: #282623;
    --type-other-ink: #b3ada4;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --surface: #141312;
  --surface-2: #1b1a18;
  --surface-3: #232220;
  --ink: #f2efe9;
  --ink-2: #b3ada4;
  --muted: #7d786f;
  --border: rgba(242, 239, 233, 0.12);
  --border-strong: rgba(242, 239, 233, 0.22);
  --accent: #f2efe9;
  --accent-ink: #141312;
  --focus: #6ea0ff;
  --status-error: #eaa6a2;
  --type-html-bg: #1b2a3b;
  --type-html-ink: #9dc3ef;
  --type-md-bg: #1e2a1f;
  --type-md-ink: #a8ceaa;
  --type-image-bg: #2e2716;
  --type-image-ink: #e3c27a;
  --type-pdf-bg: #33201f;
  --type-pdf-ink: #eaa6a2;
  --type-other-bg: #282623;
  --type-other-ink: #b3ada4;
  color-scheme: dark;
}

:root[data-theme="light"] {
  color-scheme: light;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--ink);
  color: var(--surface);
}

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

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

svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink);
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.01em;
}

.overline {
  margin: 0;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.3;
  text-transform: uppercase;
  color: var(--muted);
}

/* Lock screen */

.lock {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding: var(--space-8) var(--space-5);
}

.lock-panel {
  width: min(100%, 448px);
  padding: var(--space-10) var(--space-8);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  animation: panel-in 320ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.lock-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: var(--space-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-3);
  color: var(--ink-2);
}

.lock-mark svg {
  width: 22px;
  height: 22px;
}

.lock-panel h1 {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.lock-sub {
  margin: 0 0 var(--space-8);
  max-width: 34ch;
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.field-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-2);
}

.field-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.field-row input {
  flex: 1;
  min-width: 0;
  height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 120ms ease-out;
}

.field-row input::placeholder {
  color: var(--muted);
}

.field-row input:hover {
  border-color: var(--border-strong);
}

.primary-button {
  width: 100%;
  height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease-out, opacity 120ms ease-out;
}

.primary-button:hover {
  opacity: 0.9;
}

.primary-button:active {
  transform: scale(0.99);
}

.primary-button:disabled {
  opacity: 0.55;
  cursor: progress;
}

.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 120ms ease-out, background-color 120ms ease-out, transform 120ms ease-out;
}

.ghost-button svg {
  width: 16px;
  height: 16px;
}

.ghost-button:hover {
  border-color: var(--border-strong);
  background: var(--surface-3);
}

.ghost-button:active {
  transform: scale(0.98);
}

.ghost-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color 120ms ease-out, color 120ms ease-out, background-color 120ms ease-out;
}

.icon-button svg {
  width: 18px;
  height: 18px;
}

.icon-button:hover {
  border-color: var(--border-strong);
  color: var(--ink);
  background: var(--surface-3);
}

.error {
  margin: var(--space-3) 0 0;
  color: var(--status-error);
  font-size: 0.875rem;
}

.lock-foot {
  margin: var(--space-8) 0 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
}

/* App */

.app {
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: var(--space-8) var(--space-5) var(--space-16);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink-2);
}

.brand-mark svg {
  width: 19px;
  height: 19px;
}

.brand-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.doc-count {
  margin: 0 var(--space-2) 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: nowrap;
}

#theme-toggle .icon-moon {
  display: none;
}

:root[data-theme="dark"] #theme-toggle .icon-sun,
:root:not([data-theme="light"]) #theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] #theme-toggle .icon-moon,
:root:not([data-theme="light"]) #theme-toggle .icon-moon {
  display: block;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) #theme-toggle .icon-sun {
    display: block;
  }
  :root:not([data-theme="dark"]) #theme-toggle .icon-moon {
    display: none;
  }
}

.toolbar {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6) 0 var(--space-5);
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  width: 17px;
  height: 17px;
  color: var(--muted);
  pointer-events: none;
}

.search-wrap input {
  width: 100%;
  height: 44px;
  padding: 0 52px 0 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink);
  transition: border-color 120ms ease-out;
}

.search-wrap input::placeholder {
  color: var(--muted);
}

.search-wrap input:hover {
  border-color: var(--border-strong);
}

.search-kbd {
  position: absolute;
  right: var(--space-3);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-3);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  pointer-events: none;
}

.filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}

.filter {
  height: 30px;
  padding: 0 var(--space-3);
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--ink-2);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 120ms ease-out, color 120ms ease-out;
}

.filter:hover {
  color: var(--ink);
  background: var(--surface-3);
}

.filter.is-active {
  background: var(--accent);
  color: var(--accent-ink);
}

.sort {
  height: 36px;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink-2);
  font-size: 0.8125rem;
  cursor: pointer;
}

.sort:hover {
  border-color: var(--border-strong);
}

/* Grid */

.results {
  min-height: 240px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-height: 168px;
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  color: inherit;
  text-align: left;
  cursor: pointer;
  animation: card-in 320ms cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: calc(var(--index, 0) * 40ms);
  transition: border-color 160ms ease-out, transform 160ms ease-out, background-color 160ms ease-out;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.card:active {
  transform: scale(0.995);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 var(--space-2);
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge-html { background: var(--type-html-bg); color: var(--type-html-ink); }
.badge-markdown { background: var(--type-md-bg); color: var(--type-md-ink); }
.badge-image { background: var(--type-image-bg); color: var(--type-image-ink); }
.badge-pdf { background: var(--type-pdf-bg); color: var(--type-pdf-ink); }
.badge-other { background: var(--type-other-bg); color: var(--type-other-ink); }

.card-file {
  overflow: hidden;
  max-width: 55%;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin: auto 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.tag {
  padding: 1px var(--space-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: 0.6875rem;
  line-height: 1.6;
}

.empty {
  padding: var(--space-16) var(--space-5);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  text-align: center;
}

.empty-title {
  margin: 0 0 var(--space-2);
  font-weight: 600;
}

.empty-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.site-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-12);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
}

.site-footer p {
  margin: 0;
}

/* Viewer */

.viewer {
  width: min(1100px, calc(100vw - var(--space-8)));
  height: min(88dvh, 900px);
  max-width: none;
  max-height: none;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  color: var(--ink);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.18);
  overflow: hidden;
}

.viewer::backdrop {
  background: rgba(20, 19, 18, 0.48);
}

.viewer[open] {
  animation: dialog-in 200ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.viewer-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.viewer-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
}

.viewer-title-wrap {
  min-width: 0;
}

.viewer-title-wrap h2 {
  margin: var(--space-2) 0 var(--space-1);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.viewer-meta {
  margin: 0;
  color: var(--muted);
}

.viewer-body {
  position: relative;
  flex: 1;
  min-height: 0;
  background: var(--surface);
}

.viewer-body iframe,
.viewer-body img {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.viewer-body img {
  object-fit: contain;
  padding: var(--space-4);
}

.viewer-body .unsupported {
  display: grid;
  place-items: center;
  height: 100%;
  padding: var(--space-8);
  color: var(--ink-2);
  text-align: center;
}

.viewer-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--border);
}

.viewer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  min-height: 20px;
}

.viewer-actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.noscript {
  position: fixed;
  inset: auto var(--space-4) var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink);
  font-size: 0.875rem;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes dialog-in {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 640px) {
  .app {
    padding: var(--space-5) var(--space-4) var(--space-12);
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-3);
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .doc-count {
    margin-right: auto;
  }

  .filter-row {
    align-items: stretch;
    flex-direction: column;
  }

  .segmented {
    overflow-x: auto;
  }

  .filter {
    flex: 1 0 auto;
  }

  .viewer {
    width: 100vw;
    height: 100dvh;
    border: 0;
    border-radius: 0;
  }

  .viewer-foot {
    align-items: flex-start;
    flex-direction: column;
  }

  .lock-panel {
    padding: var(--space-8) var(--space-5);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}