/* ==========================================================================
   Combine Words — Design System
   A small, dependency-free CSS system: variables, base, layout, components.
   ========================================================================== */

:root {
  /* Brand palette */
  --cw-navy:        #0E1B3D;
  --cw-indigo:      #2540B8;
  --cw-indigo-light:#3654E0;
  --cw-teal:        #0FA39C;
  --cw-teal-light:  #17C7BE;

  /* Neutrals */
  --cw-ink:         #101935;
  --cw-slate:       #3B4358;
  --cw-slate-light: #6B7488;
  --cw-border:      #E3E7F0;
  --cw-bg:          #F6F8FC;
  --cw-surface:     #FFFFFF;

  /* Feedback */
  --cw-success-bg:  #E9FBF6;
  --cw-success-text:#0C7A66;

  /* Type */
  --cw-font-head: 'Poppins', 'Segoe UI', Arial, Helvetica, sans-serif;
  --cw-font-body: 'Inter', 'Segoe UI', Arial, Helvetica, sans-serif;
  --cw-font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, Menlo, monospace;

  /* Scale */
  --cw-radius-sm: 8px;
  --cw-radius-md: 14px;
  --cw-radius-lg: 20px;
  --cw-shadow-sm: 0 1px 2px rgba(14, 27, 61, 0.06);
  --cw-shadow-md: 0 8px 24px rgba(14, 27, 61, 0.08);
  --cw-shadow-lg: 0 20px 48px rgba(14, 27, 61, 0.14);
  --cw-max-width: 1120px;
}

/* ---- Reset / base ---------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--cw-font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--cw-slate);
  background: var(--cw-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--cw-font-head);
  color: var(--cw-ink);
  line-height: 1.2;
  margin: 0 0 0.5em;
  font-weight: 700;
}

h1 { font-size: clamp(1.9rem, 1.5rem + 1.8vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }

a { color: var(--cw-indigo); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.container {
  max-width: var(--cw-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Header ------------------------------------------------------------ */
.site-header {
  background: var(--cw-surface);
  border-bottom: 1px solid var(--cw-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand img { height: 36px; width: auto; }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--cw-slate);
  font-weight: 600;
  font-size: 0.95rem;
}

.main-nav a.is-active,
.main-nav a:hover { color: var(--cw-indigo); text-decoration: none; }

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

/* ---- Hero --------------------------------------------------------------- */
.hero {
  padding: 56px 0 24px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-family: var(--cw-font-head);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cw-teal);
  background: var(--cw-success-bg);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero p.lead {
  max-width: 620px;
  margin: 0 auto;
  font-size: 1.08rem;
  color: var(--cw-slate-light);
}

/* ---- Cards / tool panel -------------------------------------------------- */
.card {
  background: var(--cw-surface);
  border: 1px solid var(--cw-border);
  border-radius: var(--cw-radius-lg);
  box-shadow: var(--cw-shadow-md);
}

.tool-panel { padding: 28px; margin: 28px 0 48px; }

@media (max-width: 640px) {
  .tool-panel { padding: 18px; border-radius: var(--cw-radius-md); }
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 760px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-grid-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

@media (max-width: 960px) {
  .tool-grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .tool-grid-3 { grid-template-columns: 1fr; }
}

.field label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--cw-font-head);
  font-weight: 600;
  color: var(--cw-ink);
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.field .count-hint {
  font-family: var(--cw-font-body);
  font-weight: 500;
  font-size: 0.8rem;
  color: var(--cw-slate-light);
}

textarea, input[type="text"] {
  width: 100%;
  font-family: var(--cw-font-mono);
  font-size: 0.92rem;
  color: var(--cw-ink);
  background: var(--cw-bg);
  border: 1.5px solid var(--cw-border);
  border-radius: var(--cw-radius-sm);
  padding: 12px 14px;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--cw-indigo-light);
  box-shadow: 0 0 0 3px rgba(54, 84, 224, 0.15);
  background: var(--cw-surface);
}

textarea { min-height: 220px; }

.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin: 24px 0 4px;
  padding-top: 20px;
  border-top: 1px solid var(--cw-border);
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 200px;
}

.option-group .group-label {
  font-family: var(--cw-font-head);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--cw-ink);
}

.option-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--cw-slate);
}

.option-item input { accent-color: var(--cw-indigo); }

.summary-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.combo-count {
  font-family: var(--cw-font-head);
  font-weight: 600;
  color: var(--cw-teal-text, var(--cw-teal));
  font-size: 0.95rem;
}

/* ---- Buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--cw-font-head);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: var(--cw-radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--cw-indigo-light), var(--cw-indigo));
  color: #fff;
  box-shadow: var(--cw-shadow-sm);
}
.btn-primary:hover { box-shadow: var(--cw-shadow-md); }

.btn-secondary {
  background: var(--cw-surface);
  color: var(--cw-ink);
  border-color: var(--cw-border);
}
.btn-secondary:hover { border-color: var(--cw-indigo-light); color: var(--cw-indigo); }

.btn-sm { padding: 8px 14px; font-size: 0.85rem; }

.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---- Results -------------------------------------------------------------- */
.results {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--cw-border);
}

.results-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.results-toolbar .actions { display: flex; gap: 10px; flex-wrap: wrap; }

.copy-feedback {
  font-size: 0.85rem;
  color: var(--cw-success-text);
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.copy-feedback.is-visible { opacity: 1; }

/* ---- Feature grid --------------------------------------------------------- */
.features {
  padding: 8px 0 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 28px;
}

@media (max-width: 820px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.feature-card {
  padding: 22px;
}

.feature-card .icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--cw-success-bg);
  color: var(--cw-teal);
  margin-bottom: 14px;
  font-size: 1.2rem;
}

/* ---- Tools index / cards --------------------------------------------------- */
.tools-grid, .guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 28px 0 48px;
}

@media (max-width: 700px) {
  .tools-grid, .guides-grid { grid-template-columns: 1fr; }
}

.tool-card, .guide-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tool-card.is-live { border-color: var(--cw-teal-light); }

.badge {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
}

.badge.live { background: var(--cw-success-bg); color: var(--cw-success-text); }
.badge.soon { background: var(--cw-border); color: var(--cw-slate-light); }

/* ---- Prose pages (about / legal) ------------------------------------------- */
.prose {
  background: var(--cw-surface);
  border: 1px solid var(--cw-border);
  border-radius: var(--cw-radius-lg);
  padding: 40px;
  margin: 28px 0 56px;
  box-shadow: var(--cw-shadow-sm);
}

@media (max-width: 640px) { .prose { padding: 24px; } }

.prose h2 { margin-top: 1.4em; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 1.3em; }

/* ---- Footer ----------------------------------------------------------------- */
.site-footer {
  background: var(--cw-navy);
  color: #C7CEE5;
  margin-top: 40px;
}

.site-footer .container {
  padding: 40px 20px 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}

.site-footer a { color: #E7ECFB; }
.site-footer .brand img { height: 30px; }

.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.82rem;
  color: #8D97B8;
  text-align: center;
  padding: 18px 20px 26px;
}

/* ---- Utility ------------------------------------------------------------------ */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.alert {
  border-radius: var(--cw-radius-sm);
  padding: 12px 16px;
  font-size: 0.9rem;
  margin-bottom: 18px;
}
.alert-info { background: #EEF2FF; color: var(--cw-indigo); border: 1px solid #D7DFFB; }
.alert-error { background: #FDEEEE; color: #B42318; border: 1px solid #F6D0CE; }

.usage-hint {
  margin: 10px 0 0;
  font-size: 0.8rem;
  color: var(--cw-slate-light);
}

@media (max-width: 700px) {
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .main-nav.is-open {
    display: flex;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--cw-surface);
    border-bottom: 1px solid var(--cw-border);
    padding: 16px 20px;
  }
  .main-nav.is-open ul { flex-direction: column; gap: 16px; }
}