:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #f0f5ff;
  --text: #101827;
  --muted: #5d6b82;
  --border: #dfe6f0;
  --primary: #1769e0;
  --primary-dark: #0f4db2;
  --accent: #1fc7a6;
  --danger: #c24141;
  --warning: #9a6a00;
  --success: #13795b;
  --shadow: 0 20px 55px rgba(16, 24, 39, 0.09);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

a:hover {
  color: var(--primary-dark);
}

code,
pre,
textarea,
input,
select {
  font: inherit;
}

pre {
  overflow: auto;
  padding: 1rem;
  border-radius: 16px;
  background: #0f172a;
  color: #e2e8f0;
  white-space: pre-wrap;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 0.85rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: #334155;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  background: var(--text);
  color: #fff;
}

.skip-link:focus {
  left: 1rem;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.container.wide {
  width: min(1280px, calc(100% - 32px));
}

.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-wrap {
  width: min(1280px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border-radius: 13px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 10px 30px rgba(23, 105, 224, 0.25);
}

.main-nav,
.tool-strip,
.footer-links,
.hero-actions,
.admin-tabs {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.main-nav a,
.tool-strip a,
.admin-tabs a {
  color: #364256;
  font-size: 0.95rem;
  font-weight: 650;
}

.tool-strip {
  width: min(1280px, calc(100% - 32px));
  margin: 0 auto;
  padding: 0 0 0.75rem;
  gap: 0.5rem;
}

.tool-strip a {
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  font-size: 0.82rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 2rem;
  align-items: center;
  padding: 4rem 0 2.5rem;
}

.hero h1,
.page-head h1 {
  margin: 0;
  color: #0b1220;
  font-size: clamp(2.2rem, 5vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.07em;
}

.hero p,
.page-head p,
.section-head p,
.content-band p,
.tool-card p,
.sidebar-card p,
.auth-card p {
  color: var(--muted);
}

.hero p {
  max-width: 680px;
  font-size: 1.15rem;
}

.hero-panel,
.auth-card,
.tool-form,
.result-box,
.content-band,
.tool-card,
.sidebar-card,
.admin-card,
.content-page {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 1.25rem;
}

.score-card {
  min-height: 260px;
  padding: 1.5rem;
  border-radius: 18px;
  background: radial-gradient(circle at top right, rgba(31, 199, 166, 0.24), transparent 34%),
    linear-gradient(135deg, #0f172a, #153b72);
  color: #fff;
}

.score-card span {
  display: block;
  font-size: 5rem;
  line-height: 1;
  font-weight: 900;
  letter-spacing: -0.08em;
}

.score-card p {
  color: rgba(255, 255, 255, 0.72);
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.mini-grid span {
  padding: 0.95rem;
  border-radius: 15px;
  background: var(--surface-strong);
  color: #194781;
  font-weight: 750;
  text-align: center;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 0.78rem 1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 800;
}

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

.btn.ghost {
  border-color: var(--border);
  background: #fff;
  color: var(--text);
}

.section-head,
.page-head {
  padding: 2.5rem 0 1.2rem;
}

.page-head.compact {
  padding-top: 1.5rem;
}

.page-head.compact h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.crumb {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding-bottom: 2rem;
}

.tool-card,
.admin-card {
  padding: 1.25rem;
}

.tool-card h2,
.tool-card h3,
.admin-card h2 {
  margin-top: 0;
  line-height: 1.15;
}

.card-link {
  display: inline-flex;
  margin-top: 0.5rem;
  font-weight: 800;
}

.layout-with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 1.25rem;
  padding: 1rem 0 2.5rem;
}

.sidebar {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.sidebar-card,
.content-band,
.content-page {
  padding: 1.35rem;
}

.content-band {
  margin: 1rem 0 2rem;
}

.content-band.small {
  box-shadow: none;
}

.tool-form {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
  color: #334155;
  font-weight: 750;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fbfdff;
  color: var(--text);
  padding: 0.82rem 0.9rem;
  font-weight: 500;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--primary);
  outline: 3px solid rgba(23, 105, 224, 0.14);
}

.checkbox-line {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.result-box {
  padding: 1.25rem;
  margin: 1rem 0;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.metric {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fbfdff;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.metric strong {
  display: block;
  margin-top: 0.25rem;
  overflow-wrap: anywhere;
  font-size: 1.25rem;
  line-height: 1.15;
}

.result-section {
  margin-top: 1.25rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 16px;
}

.output-area {
  width: 100%;
  min-height: 220px;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
}

.copy-btn {
  margin-top: 0.6rem;
  border: 0;
  border-radius: 999px;
  padding: 0.55rem 0.85rem;
  background: #e9f1ff;
  color: var(--primary-dark);
  cursor: pointer;
  font-weight: 800;
}

.nice-list {
  padding-left: 1.2rem;
}

.nice-list li + li {
  margin-top: 0.4rem;
}

.notice {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #eef6ff;
  color: #1e3a5f;
}

.notice.error {
  background: #fff1f1;
  border-color: #ffd6d6;
  color: var(--danger);
}

.notice.warning {
  background: #fff8e5;
  border-color: #ffe4a3;
  color: var(--warning);
}

.notice.success {
  background: #edfdf7;
  border-color: #bff1df;
  color: var(--success);
}

.ad-slot {
  display: grid;
  gap: 0.45rem;
  min-height: 92px;
  margin: 1rem 0;
  padding: 0.7rem;
  border: 1px dashed #b7c6da;
  border-radius: 18px;
  background: #fbfdff;
  color: var(--muted);
  text-align: center;
  place-items: center;
}

.ad-placeholder div {
  font-size: 0.9rem;
}

.ad-label {
  display: block;
  color: #728199;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.auth-card {
  width: min(760px, 100%);
  margin: 3rem auto;
  padding: 1.5rem;
}

.auth-card.installer {
  width: min(1000px, 100%);
}

.admin-tabs {
  padding: 1rem 0 0.5rem;
}

.admin-tabs a {
  padding: 0.62rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
}

.admin-tabs a.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.admin-grid,
.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.admin-form h2 {
  margin: 1rem 0 0;
}

.muted {
  color: var(--muted);
}

.content-page {
  font-size: 1.03rem;
}

.site-footer {
  margin-top: 3rem;
  padding: 2.2rem 0;
  background: #0f172a;
  color: #dbeafe;
}

.site-footer p,
.site-footer a {
  color: #bfd2f1;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

@media (max-width: 980px) {
  .hero,
  .layout-with-sidebar {
    grid-template-columns: 1fr;
  }

  .tool-grid,
  .metrics,
  .admin-grid,
  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar {
    grid-row: auto;
  }
}

@media (max-width: 680px) {
  .nav-wrap {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

  .main-nav,
  .tool-strip {
    overflow-x: auto;
    flex-wrap: nowrap;
    width: min(1280px, calc(100% - 32px));
    padding-bottom: 0.75rem;
  }

  .hero {
    padding-top: 2rem;
  }

  .tool-grid,
  .metrics,
  .admin-grid,
  .form-grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    flex-direction: column;
  }
}