:root {
  --border: #dddddd;
  --panel: #f8f8f8;
  --text-muted: #555555;
  --flash: #fff6cc;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --text: #111111;
  --text-soft: #333333;
  --button-bg: #222222;
  --button-hover: #000000;
  --button-text: #ffffff;
  --code-bg: #f2f2f2;
  --shadow: 0 16px 34px rgba(15, 23, 42, 0.12);
}

html[data-theme="dark"] {
  --border: #334155;
  --panel: #1e293b;
  --text-muted: #94a3b8;
  --flash: #3f3a19;
  --bg: #0f172a;
  --surface: #111827;
  --surface-strong: #1f2937;
  --text: #e5e7eb;
  --text-soft: #cbd5e1;
  --button-bg: #e5e7eb;
  --button-hover: #ffffff;
  --button-text: #111827;
  --code-bg: #1f2937;
  --shadow: 0 18px 38px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 860px;
  margin: auto;
  padding: 24px 16px 48px;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

h1 {
  font-size: clamp(28px, 5vw, 42px);
  margin: 0 0 12px;
}

h2 {
  font-size: 24px;
  margin: 0 0 12px;
}

.intro {
  max-width: 720px;
  margin: auto;
  color: var(--text-muted);
  line-height: 1.6;
}

.tool-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

button {
  border: 1px solid var(--button-bg);
  background: var(--button-bg);
  color: var(--button-text);
  -webkit-text-fill-color: var(--button-text);
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: var(--button-hover);
  opacity: 1;
}

input,
textarea,
select,
.number-output,
.uuid-output,
.password-display,
.coin-output,
.result-panel,
.cat-panel,
.cat-result,
.dog-panel,
.dog-result,
.entropy-display,
.pixel-canvas,
.quantity-select,
.length-input,
.die-button {
  background: var(--surface-strong);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
  border-color: var(--border);
}

input[type="file"]::file-selector-button {
  border: 1px solid var(--button-bg);
  background: var(--button-bg);
  color: var(--button-text);
  -webkit-text-fill-color: var(--button-text);
  padding: 10px 14px;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  margin-right: 12px;
  cursor: pointer;
}

input[type="file"]::file-selector-button:hover {
  background: var(--button-hover);
}

html[data-theme="dark"] body button,
html[data-theme="dark"] body .nav-menu > summary {
  background: var(--button-bg) !important;
  border-color: var(--button-bg) !important;
  color: var(--button-text) !important;
  -webkit-text-fill-color: var(--button-text) !important;
}

html[data-theme="dark"] body button *,
html[data-theme="dark"] body .nav-menu > summary * {
  color: var(--button-text) !important;
  -webkit-text-fill-color: var(--button-text) !important;
}

html[data-theme="dark"] body button:hover,
html[data-theme="dark"] body .nav-menu > summary:hover {
  background: var(--button-hover) !important;
}

html[data-theme="dark"] body .number-output,
html[data-theme="dark"] body .uuid-output,
html[data-theme="dark"] body .password-display,
html[data-theme="dark"] body .coin-output,
html[data-theme="dark"] body .result-panel,
html[data-theme="dark"] body .cat-panel,
html[data-theme="dark"] body .cat-result,
html[data-theme="dark"] body .dog-panel,
html[data-theme="dark"] body .dog-result,
html[data-theme="dark"] body .entropy-display,
html[data-theme="dark"] body .history-list,
html[data-theme="dark"] body .history-list li,
html[data-theme="dark"] body textarea,
html[data-theme="dark"] body input,
html[data-theme="dark"] body select,
html[data-theme="dark"] body .quantity-select,
html[data-theme="dark"] body .length-input,
html[data-theme="dark"] body .die-button {
  background: var(--surface-strong) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
  -webkit-text-fill-color: var(--text) !important;
}

html[data-theme="dark"] body .number-output *,
html[data-theme="dark"] body .uuid-output *,
html[data-theme="dark"] body .password-display *,
html[data-theme="dark"] body .coin-output *,
html[data-theme="dark"] body .result-panel *,
html[data-theme="dark"] body .cat-panel *,
html[data-theme="dark"] body .cat-result *,
html[data-theme="dark"] body .dog-panel *,
html[data-theme="dark"] body .dog-result *,
html[data-theme="dark"] body .entropy-display *,
html[data-theme="dark"] body .history-list *,
html[data-theme="dark"] body .history-empty {
  color: var(--text) !important;
  -webkit-text-fill-color: var(--text) !important;
}

html[data-theme="dark"] body .number-output.flash,
html[data-theme="dark"] body .uuid-output.flash {
  background: var(--flash) !important;
}

html[data-theme="dark"] body .content-section a,
html[data-theme="dark"] body .footer a {
  color: #93c5fd !important;
}

.die-button:hover {
  background: var(--panel);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.nav-shell {
  max-width: 860px;
  margin: auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-link {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle,
.nav-menu > summary {
  list-style: none;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.nav-menu > summary {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 0;
  line-height: 1;
}

.nav-menu > summary::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  box-shadow:
    0 -6px 0 currentColor,
    0 6px 0 currentColor;
}

.nav-menu {
  position: relative;
}

.nav-menu > summary::-webkit-details-marker {
  display: none;
}

.nav-links {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 240px;
  display: grid;
  gap: 6px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.nav-links a {
  margin: 0;
  padding: 8px 10px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
}

.nav-links a:hover {
  background: var(--panel);
  text-decoration: none;
}

.content-section {
  max-width: 720px;
  margin: 40px auto 0;
  line-height: 1.7;
  color: var(--text-soft);
}

.content-section p,
.content-section li {
  margin: 0 0 16px;
}

.content-section ul {
  margin: 0 0 16px;
  padding-left: 20px;
}

.content-section code,
.intro code {
  background: var(--code-bg);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}

.footer {
  max-width: 720px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
}

.footer a {
  color: var(--text);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 14px;
}

.footer-links a {
  position: relative;
}

.footer-links a:not(:last-child)::after {
  content: "\2022";
  margin-left: 14px;
  color: var(--text-muted);
}

@media (max-width: 700px) {
  .nav-links {
    min-width: min(240px, calc(100vw - 32px));
  }
}