/* --------------------------------------------------------
   Tokens
-------------------------------------------------------- */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-alt: #f3f4f6;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --text-muted: #6b7280;
  --text-subtle: #9ca3af;

  --accent: #1f6feb;
  --accent-hover: #1959c4;
  --accent-soft: #e8f0fe;

  --weak: #ef4444;
  --fair: #f59e0b;
  --strong: #10b981;
  --very-strong: #059669;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.04);
  --shadow: 0 1px 3px rgba(17, 24, 39, 0.06), 0 4px 12px rgba(17, 24, 39, 0.04);
  --shadow-lg: 0 10px 30px rgba(17, 24, 39, 0.08);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, "Roboto Mono", monospace;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.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;
}

/* --------------------------------------------------------
   Header
-------------------------------------------------------- */
.site-header {
  padding: 24px 0 8px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

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

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
}

.brand-name {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.brand-tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

/* --------------------------------------------------------
   Ad slots
-------------------------------------------------------- */
.ad-slot {
  display: flex;
  justify-content: center;
  width: 100%;
}

.ad-leaderboard {
  padding: 24px 16px 0;
}

.ad-placeholder {
  display: grid;
  place-items: center;
  gap: 4px;
  background: repeating-linear-gradient(
    45deg,
    var(--surface-alt),
    var(--surface-alt) 10px,
    #ebedf0 10px,
    #ebedf0 20px
  );
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-subtle);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ad-leaderboard .ad-placeholder {
  width: 728px;
  max-width: 100%;
  height: 90px;
}

.ad-rectangle .ad-placeholder {
  width: 300px;
  height: 250px;
  max-width: 100%;
}

.ad-label {
  font-weight: 600;
}

.ad-size {
  font-family: var(--font-mono);
}

/* --------------------------------------------------------
   Main grid
-------------------------------------------------------- */
.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  padding: 32px 24px 48px;
  flex: 1;
  align-items: start;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------
   Card
-------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
}

@media (max-width: 600px) {
  .card {
    padding: 20px;
  }
}

/* --------------------------------------------------------
   Mode toggle
-------------------------------------------------------- */
.mode-toggle {
  display: inline-flex;
  background: var(--surface-alt);
  padding: 4px;
  border-radius: 999px;
  margin-bottom: 24px;
}

.mode-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 999px;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}

.mode-btn:hover {
  color: var(--text);
}

.mode-btn.is-active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------
   Output
-------------------------------------------------------- */
.output {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 18px 22px;
  margin-bottom: 18px;
  min-height: 76px;
}

.output-text {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.01em;
  word-break: break-all;
  user-select: all;
  line-height: 1.35;
}

@media (max-width: 600px) {
  .output-text {
    font-size: 18px;
  }
}

.output-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.icon-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

.icon-btn:active {
  transform: translateY(1px);
}

.icon-btn.is-success {
  color: var(--strong);
}

/* --------------------------------------------------------
   Strength meter
-------------------------------------------------------- */
.strength {
  margin-bottom: 28px;
}

.strength-bar {
  position: relative;
  height: 6px;
  background: var(--surface-alt);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 8px;
}

.strength-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--border-strong);
  transition: width 240ms ease, background 240ms ease;
}

.strength-fill.is-weak { background: var(--weak); }
.strength-fill.is-fair { background: var(--fair); }
.strength-fill.is-strong { background: var(--strong); }
.strength-fill.is-very-strong { background: var(--very-strong); }

.strength-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 13px;
}

.strength-label {
  font-weight: 600;
  color: var(--text-muted);
}

.strength-label.is-weak { color: var(--weak); }
.strength-label.is-fair { color: var(--fair); }
.strength-label.is-strong { color: var(--strong); }
.strength-label.is-very-strong { color: var(--very-strong); }

.strength-entropy {
  color: var(--text-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* --------------------------------------------------------
   Options
-------------------------------------------------------- */
.options {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: 28px;
}

.options.is-hidden {
  display: none;
}

.option-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.option-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 10px;
  border-radius: 6px;
  min-width: 36px;
  text-align: center;
}

/* Range slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--surface-alt);
  border-radius: 999px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 1px 4px rgba(31, 111, 235, 0.4);
  transition: transform 120ms ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 1px 4px rgba(31, 111, 235, 0.4);
}

/* Select */
.select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  cursor: pointer;
}

.select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Checkbox grid */
.checkbox-grid {
  border: 0;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 480px) {
  .checkbox-grid {
    grid-template-columns: 1fr;
  }
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
  user-select: none;
}

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

.check input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.check-box {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--border-strong);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: background 160ms ease, border-color 160ms ease;
}

.check-box::after {
  content: "";
  width: 10px;
  height: 10px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 120ms ease;
}

.check input:checked ~ .check-box {
  background: var(--accent);
  border-color: var(--accent);
}

.check input:checked ~ .check-box::after {
  opacity: 1;
}

.check input:focus-visible ~ .check-box {
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* --------------------------------------------------------
   Primary button
-------------------------------------------------------- */
.btn-primary {
  appearance: none;
  border: 0;
  width: 100%;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 160ms ease, transform 80ms ease;
  font-family: inherit;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: translateY(1px);
}

/* --------------------------------------------------------
   Sidebar
-------------------------------------------------------- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar .ad-slot {
  justify-content: flex-start;
}

@media (max-width: 900px) {
  .sidebar .ad-slot {
    justify-content: center;
  }
}

.info {
  padding: 22px;
}

.info-title {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.info-list {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.info-list li + li {
  margin-top: 6px;
}

.info-list code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--surface-alt);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
}

/* --------------------------------------------------------
   Footer
-------------------------------------------------------- */
.site-footer {
  padding: 24px 0 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-subtle);
}

.site-footer p {
  margin: 0;
}

/* --------------------------------------------------------
   Toast
-------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
  z-index: 100;
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --------------------------------------------------------
   Focus styles
-------------------------------------------------------- */
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

input[type="range"]:focus-visible {
  box-shadow: none;
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 4px var(--accent-soft), 0 1px 4px rgba(31, 111, 235, 0.4);
}

/* --------------------------------------------------------
   Site nav (header + footer)
-------------------------------------------------------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.site-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  transition: background 160ms ease, color 160ms ease;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--surface-alt);
}

.site-nav a.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

@media (max-width: 480px) {
  .site-nav a {
    padding: 6px 10px;
    font-size: 13px;
  }
}

/* --------------------------------------------------------
   Footer (extended)
-------------------------------------------------------- */
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.footer-nav {
  justify-content: center;
}

.footer-copy {
  margin: 0;
}

/* --------------------------------------------------------
   Prose / content pages
-------------------------------------------------------- */
.page-main {
  display: block;
  flex: 1;
  padding: 24px 24px 48px;
}

.prose {
  max-width: 760px;
  margin: 0 auto;
}

.prose .card {
  padding: 36px;
}

@media (max-width: 600px) {
  .prose .card {
    padding: 24px;
  }
}

.prose h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.prose .lede {
  margin: 0 0 24px;
  font-size: 16px;
  color: var(--text-muted);
}

.prose h2 {
  margin: 28px 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.prose p,
.prose ul {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--text);
  line-height: 1.65;
}

.prose ul {
  padding-left: 20px;
}

.prose ul li + li {
  margin-top: 6px;
}

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

.prose a:hover {
  text-decoration: underline;
}

.prose .meta {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-subtle);
}

/* --------------------------------------------------------
   Contact form
-------------------------------------------------------- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 8px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
  line-height: 1.55;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-note {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* --------------------------------------------------------
   Secondary button
-------------------------------------------------------- */
.btn-secondary {
  appearance: none;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease;
  font-family: inherit;
}

.btn-secondary:hover {
  background: var(--surface-alt);
  border-color: var(--text-subtle);
}

/* --------------------------------------------------------
   Cookie consent banner
-------------------------------------------------------- */
.cookie-banner {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 18px 20px;
  z-index: 200;
  display: none;
}

.cookie-banner.is-visible {
  display: block;
}

.cookie-banner-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0;
}

.cookie-text {
  margin: 0;
  font-size: 14px;
  color: var(--text);
  flex: 1;
  min-width: 240px;
  line-height: 1.55;
}

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

.cookie-text a:hover {
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.cookie-actions .btn-primary,
.cookie-actions .btn-secondary {
  width: auto;
  padding: 10px 18px;
  font-size: 14px;
}

@media (max-width: 600px) {
  .cookie-banner {
    left: 8px;
    right: 8px;
    bottom: 8px;
    padding: 16px;
  }

  .cookie-banner-inner {
    align-items: stretch;
  }

  .cookie-actions {
    width: 100%;
  }

  .cookie-actions .btn-primary,
  .cookie-actions .btn-secondary {
    flex: 1;
  }
}