:root {
  --bg: #f4f6f8;
  --bg-alt: #e8ecf0;
  --surface: #ffffff;
  --text: #1a2332;
  --text-muted: #5c6b7a;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-soft: rgba(13, 148, 136, 0.12);
  --border: #d1dae3;
  --shadow: 0 4px 24px rgba(26, 35, 50, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'DM Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --max: 1120px;
  --narrow: 720px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-soft), transparent),
    linear-gradient(180deg, var(--bg) 0%, #eef1f4 100%);
  z-index: -1;
  pointer-events: none;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.container-narrow {
  max-width: var(--narrow);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
}

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

.logo-mark {
  color: var(--accent);
  font-size: 1.25rem;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9375rem;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

/* Main */
.main-content {
  flex: 1;
  padding-bottom: 3rem;
}

/* Hero */
.hero {
  padding: 3rem 0 2.5rem;
}

.hero-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.hero-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-desc {
  margin: 0 0 1.75rem;
  max-width: 36rem;
  color: var(--text-muted);
  font-size: 1.0625rem;
}

/* Search */
.search-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 36rem;
  padding: 0.375rem 0.375rem 0.375rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.search-icon {
  color: var(--text-muted);
  font-size: 1.125rem;
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 1rem;
  outline: none;
  min-width: 0;
}

.search-input::placeholder {
  color: #9aa8b5;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

/* Sections */
.section {
  padding: 2rem 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.5);
  border-top: 1px solid var(--border);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.section-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.section-link {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Tool grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.15s, transform 0.15s;
}

.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.tool-card-link {
  flex: 1;
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  color: inherit;
}

.tool-card-link:hover {
  color: inherit;
}

.tool-card-icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
}

.tool-card-category {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.tool-card-title {
  margin: 0 0 0.375rem;
  font-size: 1.0625rem;
  font-weight: 700;
}

.tool-card-summary {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.tool-card-actions {
  display: flex;
  gap: 0.5rem;
  padding: 0 1rem 1rem;
}

/* Page header */
.page-header {
  padding: 2.5rem 0 1.5rem;
}

.page-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.page-desc,
.lead {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
}

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.chip {
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.chip:hover,
.chip.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.result-count,
.empty-state {
  color: var(--text-muted);
  margin: 0 0 1rem;
}

/* Tool intro */
.tool-intro {
  padding: 2rem 0 3rem;
}

.breadcrumb {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

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

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

.intro-header {
  margin-bottom: 2rem;
}

.intro-icon {
  display: inline-flex;
  width: 3rem;
  height: 3rem;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--accent-soft);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
}

.intro-category {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.intro-title {
  margin: 0 0 0.75rem;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.intro-summary {
  margin: 0 0 1.5rem;
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.intro-block {
  margin-bottom: 2rem;
}

.intro-block h2 {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
  font-weight: 700;
}

.intro-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.intro-list li {
  margin-bottom: 0.5rem;
}

.intro-block-note {
  padding: 1rem 1.25rem;
  background: var(--accent-soft);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.intro-block-note .intro-list {
  padding-left: 1rem;
}

/* About */
.about-page {
  padding: 2.5rem 0 3rem;
}

.about-block {
  margin-bottom: 2rem;
}

.about-block h2 {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
}

.about-cta {
  margin-top: 2rem;
}

/* Tool app */
.tool-app {
  padding: 1.5rem 0 3rem;
}

.tool-app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.tool-app-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.tool-app-layout {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .text-counter-app {
    grid-template-columns: 1fr 320px;
    align-items: start;
  }
}

.tool-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.875rem;
}

.tool-textarea {
  display: block;
  width: 100%;
  min-height: 320px;
  padding: 1rem;
  border: none;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  outline: none;
}

.tool-panel-stats {
  padding: 1.25rem;
}

.stats-heading {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 700;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1rem;
  margin: 0;
}

.stat-item {
  margin: 0;
}

.stat-item dt {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-item dd {
  margin: 0.25rem 0 0;
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--accent);
}

/* Footer */
.site-footer {
  margin-top: auto;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
  text-align: center;
}

.site-footer p {
  margin: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-note {
  font-size: 0.8125rem !important;
  opacity: 0.85;
}

/* 404 */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.error-code {
  margin: 0;
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--mono);
}

.error-msg {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .site-nav {
    gap: 0;
  }

  .nav-link {
    padding: 0.5rem 0.5rem;
    font-size: 0.8125rem;
  }

  .search-bar {
    flex-wrap: wrap;
  }

  .search-bar .btn {
    width: 100%;
  }
}