/* ==========================================================================
   SpellUpz — design tokens
   ========================================================================== */
:root {
  --paper: #F6F6F4;
  --surface: #FFFFFF;
  --ink: #14161A;
  --ink-soft: #55585F;
  --ink-faint: #8A8D94;
  --line: #E3E3DF;
  --line-strong: #D2D2CC;
  --accent: #2F3EE4;
  --accent-ink: #23309C;
  --accent-soft: #ECEEFD;
  --teal: #0F9D8B;
  --teal-soft: #E4F5F2;
  --error: #B3261E;
  --error-soft: #FBECEB;

  --font-body: 'Signika', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

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

  --shadow-card: 0 1px 2px rgba(20, 22, 26, 0.04), 0 8px 24px -12px rgba(20, 22, 26, 0.12);
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

h1, h2, h3 { font-family: var(--font-body); font-weight: 600; line-height: 1.15; margin: 0; color: var(--ink); }

p { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button { font-family: inherit; cursor: pointer; }

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

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.section-lead {
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 17px;
  margin-top: 12px;
}

section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }

@media (max-width: 720px) {
  section { padding: 52px 0; }
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 246, 244, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo-mark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

.main-nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  color: var(--ink-soft);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover { color: var(--ink); }

.nav-link.is-active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.mobile-nav a {
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.mobile-nav.is-open { display: flex; }

@media (max-width: 640px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
}

/* ==========================================================================
   Tool section
   ========================================================================== */
.tool-section {
  padding-top: 56px;
}

.tool-section h1 {
  font-size: clamp(28px, 4vw, 40px);
  max-width: 760px;
}

.tool-card {
  margin-top: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px;
  max-width: 720px;
}

.tool-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.tool-input-row {
  display: flex;
  gap: 12px;
}

.tool-input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color 0.15s ease;
}

.tool-input:focus {
  border-color: var(--accent);
  outline: none;
}

.tool-input::placeholder { color: var(--ink-faint); }

.btn {
  border: none;
  border-radius: var(--radius-md);
  padding: 0 24px;
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  transition: background 0.15s ease;
}

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

.tool-result {
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px dashed var(--line-strong);
}

.result-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.result-words {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
}

.tool-result[data-state="error"] .result-error {
  color: var(--error);
  background: var(--error-soft);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 15px;
}

.result-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.btn-ghost {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  transition: background 0.15s ease;
}

.btn-ghost:hover { background: #DFE2FB; }

@media (max-width: 560px) {
  .tool-input-row { flex-direction: column; }
  .btn { padding: 14px 24px; }
}

/* ==========================================================================
   Benefits
   ========================================================================== */
.benefits-section h2, .how-section h2, .faq-section h2, .page-intro-section h1 {
  font-size: clamp(24px, 3vw, 32px);
  max-width: 620px;
}

.benefits-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.benefit-card {
  background: var(--surface);
  padding: 28px;
}

.benefit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 18px;
}

.benefit-icon svg { width: 20px; height: 20px; }

.benefit-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.benefit-card p {
  color: var(--ink-soft);
  font-size: 15px;
}

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

@media (max-width: 560px) {
  .benefits-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   How to use
   ========================================================================== */
.how-steps {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.how-step {
  position: relative;
  padding-top: 8px;
  border-top: 2px solid var(--ink);
}

.step-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.how-step h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.how-step p {
  color: var(--ink-soft);
  font-size: 15px;
}

@media (max-width: 720px) {
  .how-steps { grid-template-columns: 1fr; gap: 28px; }
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list {
  margin-top: 36px;
  max-width: 760px;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.faq-item summary {
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform 0.15s ease;
}

.faq-item[open] summary::after {
  content: '\2212';
}

.faq-item p {
  color: var(--ink-soft);
  font-size: 15px;
  margin-top: 12px;
  max-width: 640px;
}

/* ==========================================================================
   Popular numbers table page
   ========================================================================== */
.page-intro-section { padding-bottom: 40px; }

.table-section { padding-top: 0; }

.table-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.numbers-table {
  width: 100%;
  border-collapse: collapse;
}

.numbers-table thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-weight: 500;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.numbers-table td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

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

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

.cell-num {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--ink);
  width: 90px;
}

.cell-words { color: var(--ink-soft); }

.cell-link { text-align: right; width: 110px; }

.cell-link a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-ink);
}

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

@media (max-width: 560px) {
  .numbers-table thead { display: none; }
  .numbers-table, .numbers-table tbody, .numbers-table tr, .numbers-table td {
    display: block;
    width: 100%;
  }
  .numbers-table tr {
    padding: 14px 20px;
    border-bottom: 1px solid var(--line);
  }
  .numbers-table td { padding: 2px 0; border-bottom: none; }
  .cell-num::before { content: 'Number: '; color: var(--ink-faint); font-family: var(--font-body); }
  .cell-link { text-align: left; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--line);
  padding-top: 48px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
  padding-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 14px;
  max-width: 320px;
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-col h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-weight: 500;
  margin-bottom: 14px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 5px 0;
}

.footer-col a:hover { color: var(--ink); }

.footer-bottom {
  padding: 20px 24px;
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  font-size: 13px;
  color: var(--ink-faint);
}

@media (max-width: 640px) {
  .footer-inner { flex-direction: column; gap: 32px; }
  .footer-links { gap: 40px; }
}