/* =========================================================
   Number to Words — design tokens
   Display/body: Signika · Utility/numeric: JetBrains Mono
   ========================================================= */

:root {
  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --ink: #191C22;
  --ink-soft: #4B5160;
  --muted: #868D9B;
  --border: #E6E7EB;
  --accent: #3B4CE0;
  --accent-ink: #FFFFFF;
  --accent-soft: #ECEEFD;
  --accent-soft-border: #D6DAF9;

  --font-display: "Signika", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(25, 28, 34, 0.06);
  --shadow-md: 0 6px 24px rgba(25, 28, 34, 0.08);

  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-display);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 200;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
}

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

/* =========================
   Header / Navigation
   ========================= */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 18px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before {
  content: "";
  position: absolute;
  top: -6px;
}
.nav-toggle span::after {
  content: "";
  position: absolute;
  top: 6px;
}

@media (max-width: 760px) {
  .nav-toggle {
    display: block;
  }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links li {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-links li:last-child {
    border-bottom: none;
  }
}

/* =========================
   Buttons
   ========================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  padding: 13px 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.15s ease;
}

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

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--ink);
}

/* =========================
   Hero
   ========================= */

.hero {
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(34px, 5vw, 52px);
  max-width: 14ch;
}

.hero-lead {
  font-size: 18px;
  max-width: 46ch;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.hero-stat .value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  display: block;
}

.hero-stat .label {
  font-size: 13px;
  color: var(--muted);
}

/* Hero visual: a "ledger" style demonstration card */
.hero-visual {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
}

.ledger-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
}
.ledger-row:last-child {
  border-bottom: none;
}

.ledger-row .num {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--ink);
}

.ledger-row .words {
  font-size: 14px;
  color: var(--ink-soft);
  text-align: right;
  max-width: 60%;
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

/* =========================
   Tool section
   ========================= */

.tool-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 40px;
  max-width: 760px;
  margin: 0 auto;
}

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

.tool-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.tool-input {
  flex: 1;
  min-width: 220px;
  font-family: var(--font-mono);
  font-size: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--ink);
}

.tool-input:focus {
  border-color: var(--accent);
  background: var(--surface);
}

.tool-error {
  margin-top: 12px;
  font-size: 14px;
  color: #B3261E;
  background: #FBEAEA;
  border: 1px solid #F1CFCE;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

/* Result — the signature "word receipt" */
.result-card {
  margin-top: 32px;
  border: 1px solid var(--accent-soft-border);
  background: var(--accent-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.result-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--ink);
  color: #fff;
}

.result-tab .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-tab .input-echo {
  font-family: var(--font-mono);
  font-size: 14px;
  opacity: 0.85;
}

.result-body {
  padding: 28px 24px;
}

.result-words {
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 600;
  color: var(--ink);
  margin: 0;
  line-height: 1.35;
}

.result-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--accent-soft-border);
  color: var(--ink);
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.copy-btn:hover {
  border-color: var(--accent);
}

/* =========================
   Benefits
   ========================= */

.section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.benefit-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px;
}

.benefit-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.benefit-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.benefit-card p {
  font-size: 14.5px;
  margin: 0;
}

@media (max-width: 860px) {
  .benefit-grid {
    grid-template-columns: 1fr;
  }
}

/* =========================
   How to use — numbered steps (a real sequence)
   ========================= */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 8px;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}

.step h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.step p {
  font-size: 14.5px;
  margin: 0;
}

@media (max-width: 860px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

/* =========================
   FAQ
   ========================= */

.faq-list {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 4px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-question .icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}
.faq-question .icon::before,
.faq-question .icon::after {
  content: "";
  position: absolute;
  background: var(--ink);
  transition: transform 0.2s ease;
}
.faq-question .icon::before {
  width: 12px;
  height: 2px;
  top: 9px;
  left: 4px;
}
.faq-question .icon::after {
  width: 2px;
  height: 12px;
  top: 4px;
  left: 9px;
}
.faq-item.open .faq-question .icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.faq-answer p {
  padding: 0 4px 20px;
  font-size: 14.5px;
  margin: 0;
}

/* =========================
   Popular numbers page
   ========================= */

.page-head {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
}

.page-head h1 {
  font-size: clamp(28px, 4vw, 38px);
}

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

table.numbers-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

table.numbers-table thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 66px;
}

table.numbers-table td {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

table.numbers-table tr:last-child td {
  border-bottom: none;
}

table.numbers-table td.num-cell {
  font-family: var(--font-mono);
  color: var(--ink);
  white-space: nowrap;
}

table.numbers-table td.num-cell a {
  text-decoration: none;
  color: inherit;
}
table.numbers-table td.num-cell a:hover {
  color: var(--accent);
}

table.numbers-table tbody tr:hover {
  background: var(--accent-soft);
}

/* =========================
   Footer
   ========================= */

.site-footer {
  padding: 40px 0;
}

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

.footer-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.footer-links a {
  text-decoration: none;
  color: var(--ink-soft);
}
.footer-links a:hover {
  color: var(--ink);
}

.footer-note {
  font-size: 13px;
  color: var(--muted);
}

/* =========================
   Breadcrumb (result page)
   ========================= */

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 18px;
}
.breadcrumb a {
  text-decoration: none;
  color: var(--muted);
}
.breadcrumb a:hover {
  color: var(--ink);
}