/*
  Original design system — not derived from Lusha's visual assets, copy, or
  layout (see docs/architecture/decision-records/0001, master prompt rule 17).
  Deliberately plain CSS custom properties + utility/component classes,
  no build step required (see IMPLEMENTATION_PLAN.md frontend assumption).
*/

:root {
  /* Brand palette — a teal/indigo pairing, distinct from Lusha's purple. */
  --color-primary-50: #eef6f6;
  --color-primary-100: #d3e9e8;
  --color-primary-300: #7ab8b5;
  --color-primary-500: #1f7a75;
  --color-primary-600: #17615c;
  --color-primary-700: #124b47;

  --color-accent-500: #4f5fd1;
  --color-accent-600: #3d4bb5;

  --color-success-500: #1c8a5a;
  --color-warning-500: #b8790a;
  --color-danger-500: #c0392b;
  --color-info-500: #2d6cdf;

  --color-bg: #f7f8f9;
  --color-surface: #ffffff;
  --color-border: #e2e5e8;
  --color-text: #1c2226;
  --color-text-muted: #5b6670;
  --color-text-inverse: #ffffff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.75rem;
  --font-size-2xl: 2.25rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(20, 25, 30, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 25, 30, 0.10);

  --nav-width: 248px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12181b;
    --color-surface: #1a2226;
    --color-border: #2a3338;
    --color-text: #eef1f2;
    --color-text-muted: #9fb0b6;
    --color-primary-50: #16302e;
    --color-primary-100: #1c3d3a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary-600); }
a:hover { color: var(--color-primary-700); }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 var(--space-3); }
p { margin: 0 0 var(--space-3); }

.container {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* --- Buttons ------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  min-height: 44px;
}

.btn-primary { background: var(--color-primary-500); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-600); color: var(--color-text-inverse); }

.btn-secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-primary-50); }

.btn-danger { background: var(--color-danger-500); color: #fff; }

.btn-sm { min-height: 36px; padding: var(--space-1) var(--space-3); font-size: var(--font-size-xs); }
.btn-xs { min-height: 28px; padding: 2px var(--space-2); font-size: var(--font-size-xs); }
.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* --- Forms --------------------------------------------------------------- */

label { display: block; font-size: var(--font-size-sm); font-weight: 600; margin-bottom: var(--space-1); }
.field-hint { font-size: var(--font-size-xs); color: var(--color-text-muted); margin-top: var(--space-1); }
.field-error { font-size: var(--font-size-xs); color: var(--color-danger-500); margin-top: var(--space-1); }

.input, select.input, textarea.input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-md);
  min-height: 44px;
}

.input:focus, select.input:focus, textarea.input:focus {
  outline: 2px solid var(--color-primary-300);
  outline-offset: 1px;
}

.input.has-error { border-color: var(--color-danger-500); }
.form-group { margin-bottom: var(--space-4); }
.checkbox-row { display: flex; align-items: flex-start; gap: var(--space-2); }
.checkbox-row input { margin-top: 4px; }

/* --- Cards / surfaces ----------------------------------------------------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.card-compact { padding: var(--space-4); }

/* --- Alerts / banners (required UI states) -------------------------------- */

.alert {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  border: 1px solid transparent;
  margin-bottom: var(--space-4);
}

.alert-info { background: #eaf1fd; color: #1d4c96; border-color: #cfe0fb; }
.alert-success { background: #e7f6ee; color: #146c44; border-color: #c9ecd9; }
.alert-warning { background: #fdf3e3; color: #8a5a05; border-color: #f7e2b8; }
.alert-danger { background: #fbeae7; color: #96291b; border-color: #f5cfc8; }

@media (prefers-color-scheme: dark) {
  .alert-info { background: #142236; color: #a9c6f7; border-color: #1f3a5c; }
  .alert-success { background: #10261b; color: #9fe3bd; border-color: #1c4230; }
  .alert-warning { background: #2c2211; color: #f3cd85; border-color: #4a3a17; }
  .alert-danger { background: #2c1714; color: #f3a89c; border-color: #4a2420; }
}

/* --- Badges ---------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: 999px;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.badge-muted { background: var(--color-border); color: var(--color-text-muted); }
.badge-danger { background: #fbeae7; color: var(--color-danger-500); }
.badge-warning { background: #fdf3e3; color: var(--color-warning-500); }
.badge-success { background: #e7f6ee; color: var(--color-success-500); }

/* --- Public site shell ------------------------------------------------------ */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.site-header nav a {
  color: var(--color-text);
  text-decoration: none;
  margin-inline-start: var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: var(--font-size-lg);
  color: var(--color-text);
  text-decoration: none;
}

.hero {
  padding-block: var(--space-8);
  text-align: left;
}

.hero h1 { font-size: var(--font-size-2xl); max-width: 34ch; }
.hero p.lede { font-size: var(--font-size-lg); color: var(--color-text-muted); max-width: 60ch; }

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Authenticated app shell ------------------------------------------------- */

.app-shell { display: flex; min-height: 100vh; }

.app-nav {
  width: var(--nav-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  inset-block: 0;
  overflow-y: auto;
}

.app-nav .brand-mark { padding: var(--space-5); }

.app-nav-section { padding: 0 var(--space-3); }

.app-nav a.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 2px;
}

.app-nav a.nav-link:hover { background: var(--color-primary-50); color: var(--color-text); }
.app-nav a.nav-link.is-active { background: var(--color-primary-50); color: var(--color-primary-700); }

.app-nav-wallet {
  margin: var(--space-4) var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  font-size: var(--font-size-sm);
}

.app-main {
  margin-inline-start: var(--nav-width);
  flex: 1;
  padding: var(--space-6) var(--space-6);
  min-width: 0;
}

.app-topbar {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 960px) {
  .app-nav { transform: translateX(-100%); transition: transform 0.2s ease; z-index: 40; }
  .app-nav.is-open { transform: translateX(0); box-shadow: var(--shadow-md); }
  .app-main { margin-inline-start: 0; }
  .app-topbar { display: flex; }
}

/* --- Prospecting-style layout building blocks (used from Phase 3 on) -------- */

.workspace { display: flex; gap: var(--space-5); align-items: flex-start; }
.workspace-filters { width: 280px; flex-shrink: 0; }
.workspace-results { flex: 1; min-width: 0; }

.filter-group summary {
  cursor: pointer;
  font-weight: 600;
  padding: var(--space-2) 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border-radius: 999px;
  padding: 2px var(--space-2) 2px var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.chip button { border: none; background: none; cursor: pointer; color: inherit; }

@media (max-width: 960px) {
  .workspace { flex-direction: column; }
  .workspace-filters { width: 100%; }
}

/* --- Tables ------------------------------------------------------------------ */

table.data-table { width: 100%; border-collapse: collapse; font-size: var(--font-size-sm); }
table.data-table th { text-align: left; color: var(--color-text-muted); font-weight: 600; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--color-border); }
table.data-table td { padding: var(--space-3); border-bottom: 1px solid var(--color-border); vertical-align: top; }

/* --- Utility ------------------------------------------------------------------ */

.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.stack > * + * { margin-top: var(--space-4); }

.icon { width: 1.15em; height: 1.15em; display: inline-block; vertical-align: -0.2em; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary-700);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  z-index: 100;
}

.skip-link:focus { left: var(--space-3); top: var(--space-3); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}