/* ═══════════════════════════════════════════════════════════════════════════
   SignalTrail — Design System
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --gray-50: #f8f9fb;
  --gray-100: #f0f1f5;
  --gray-200: #e2e4ea;
  --gray-300: #c8cbd6;
  --gray-400: #9ca1b0;
  --gray-500: #6e758a;
  --gray-600: #4b5163;
  --gray-700: #353a4a;
  --gray-800: #1e2232;
  --gray-850: #181c2b;
  --gray-900: #111523;
  --gray-950: #0a0d17;

  --indigo-400: #818cf8;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-900: #312e81;

  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;

  --red-400: #f87171;
  --red-500: #ef4444;

  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Space Mono", ui-monospace, "Cascadia Code", monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset / Base ──────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--gray-50);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 60%, rgba(20, 184, 166, 0.03) 0%, transparent 50%);
  background-attachment: fixed;
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--indigo-600);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--indigo-500); }

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

code, pre, kbd {
  font-family: var(--font-mono);
  font-size: 0.83rem;
}

/* ─── Typography ─────────────────────────────────────────────────────────── */

h1, h2, h3 { font-weight: 600; line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.15rem; color: var(--gray-700); }
h3 { font-size: 1rem; }

/* ─── Nav ───────────────────────────────────────────────────────────────── */

.top-nav {
  border-bottom: 1px solid var(--gray-200);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-inner {
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--gray-900);
  letter-spacing: -0.01em;
}
.brand svg { color: var(--indigo-500); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}
.nav-links a {
  color: var(--gray-600);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav-links a:hover {
  color: var(--gray-900);
  background: var(--gray-100);
}

/* ─── Buttons ────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--indigo-600);
  color: white;
  border-color: var(--indigo-600);
}
.btn-primary:hover {
  background: var(--indigo-500);
  border-color: var(--indigo-500);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border-color: var(--gray-300);
}
.btn-ghost:hover {
  background: var(--gray-100);
  color: var(--gray-900);
  border-color: var(--gray-400);
}

.btn-danger {
  background: transparent;
  color: var(--red-500);
  border-color: var(--red-500);
}
.btn-danger:hover {
  background: #fef2f2;
  color: #dc2626;
}

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius); }
.btn-block { width: 100%; }

.link-btn {
  background: none;
  border: none;
  color: var(--gray-600);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.link-btn:hover { color: var(--gray-900); background: var(--gray-100); }

.inline-form { display: inline; }

/* ─── Layout ─────────────────────────────────────────────────────────────── */

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px;
}

.full-width { padding: 0; }

/* ─── Dashboard Layout ───────────────────────────────────────────────────── */

.dashboard-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 57px);
}

.sidebar {
  background: var(--gray-850);
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  font-size: 0.85rem;
  color: var(--gray-400);
  text-decoration: none;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}
.sidebar-link:hover {
  color: var(--gray-200);
  background: rgba(255,255,255,0.04);
}
.sidebar-link.active {
  color: white;
  background: rgba(99, 102, 241, 0.15);
  border-left-color: var(--indigo-500);
}

.sidebar-new {
  margin-top: 8px;
  color: var(--indigo-400) !important;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 16px;
}

.dashboard-content {
  padding: 32px 36px;
  overflow-x: auto;
}

/* ─── Stats ──────────────────────────────────────────────────────────────── */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0 32px;
}

.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 20px 24px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.stat-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.stat-card.gradient-1 { border-top: 3px solid var(--indigo-500); }
.stat-card.gradient-2 { border-top: 3px solid var(--teal-500); }
.stat-card.gradient-3 { border-top: 3px solid #f59e0b; }
.stat-card.gradient-4 { border-top: 3px solid #8b5cf6; }

.stat-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.stat-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}

/* ─── Cards ──────────────────────────────────────────────────────────────── */

.card {
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  margin-bottom: 24px;
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--gray-100);
}
.card-header h2 { font-size: 0.95rem; }

.card > p { padding: 0 24px 18px; }
.card > form.form { padding: 24px; }
.card > .data-table { margin: 0; }
.card > .bar-chart { padding: 24px; }
.card > .empty-state { padding: 24px; }

/* ─── Project Header ─────────────────────────────────────────────────────── */

.project-header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.project-header h1 { margin-bottom: 0; }

.domain-badge {
  font-size: 0.78rem;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 3px 10px;
  border-radius: 99px;
  font-family: var(--font-mono);
}

.demo-badge {
  font-size: 0.75rem;
  background: #fef3c7;
  color: #92400e;
  padding: 3px 10px;
  border-radius: 99px;
  font-weight: 500;
}

/* ─── Code Blocks ────────────────────────────────────────────────────────── */

.code-desc {
  padding: 18px 24px 0;
  font-size: 0.85rem;
  color: var(--gray-600);
}

.code-block {
  margin: 12px 24px 18px;
  padding: 16px 20px;
  background: var(--gray-900);
  color: var(--teal-400);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.copy-btn {
  margin: 0 24px 18px;
}

/* ─── Data Tables ────────────────────────────────────────────────────────── */

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 12px 24px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.data-table td {
  padding: 12px 24px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.data-table tbody tr:hover td { background: var(--gray-50); }
.data-table td.num, .data-table th.num { text-align: right; }
.data-table.compact td { padding: 10px 24px; }

/* ─── Badges ─────────────────────────────────────────────────────────────── */

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-blue { background: #e0e7ff; color: var(--indigo-600); }
.badge-purple { background: #ede9fe; color: #7c3aed; }

/* ─── Bar Chart ──────────────────────────────────────────────────────────── */

.bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 180px;
  padding: 0 24px 8px;
}

.bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
}

.bar {
  width: 100%;
  max-width: 48px;
  min-height: 4px;
  background: var(--indigo-500);
  border-radius: 4px 4px 0 0;
  position: relative;
  transition: all var(--transition);
  cursor: pointer;
}

.bar:hover {
  background: var(--indigo-400);
  filter: brightness(1.1);
}

.bar-tip {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--gray-700);
  opacity: 0;
  transition: opacity var(--transition);
}

.bar:hover .bar-tip { opacity: 1; }

.bar-label {
  margin-top: 8px;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--gray-500);
  text-transform: uppercase;
}

/* ─── Two Column Grid ────────────────────────────────────────────────────── */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.two-col > .card { margin-bottom: 0; }

/* ─── Empty States ───────────────────────────────────────────────────────── */

.empty-state {
  text-align: center;
  padding: 48px 24px;
}
.empty-state.small { padding: 32px 24px; }
.empty-state p {
  color: var(--gray-500);
  margin-bottom: 16px;
  font-size: 0.9rem;
}

/* ─── Alerts ─────────────────────────────────────────────────────────────── */

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 16px;
}
.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ─── Forms ──────────────────────────────────────────────────────────────── */

.form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form label span {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-700);
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"] {
  padding: 11px 14px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  background: white;
  color: var(--gray-900);
  transition: all var(--transition);
}

.form input:focus {
  outline: none;
  border-color: var(--indigo-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form input::placeholder { color: var(--gray-400); }

/* ─── Auth Card ──────────────────────────────────────────────────────────── */

.auth-card {
  max-width: 400px;
  margin: 80px auto;
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.auth-card h1 {
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.auth-sub {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.auth-footer {
  margin-top: 20px;
  font-size: 0.85rem;
  color: var(--gray-500);
  text-align: center;
}

/* ─── Danger Zone ────────────────────────────────────────────────────────── */

.danger-zone {
  border: 1px solid #fecaca;
}

.danger-zone .card-header {
  border-bottom-color: #fecaca;
}

.danger-zone p {
  color: var(--gray-600);
  font-size: 0.85rem;
}

/* ─── Hero ───────────────────────────────────────────────────────────────── */

.hero {
  text-align: center;
  padding: 100px 24px 80px;
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--indigo-600);
  background: #e0e7ff;
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Preview Section ────────────────────────────────────────────────────── */

.preview-section {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 100px;
}

.preview-frame {
  background: var(--gray-900);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.preview-header {
  background: var(--gray-800);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.preview-dot.red { background: #ef4444; }
.preview-dot.yellow { background: #f59e0b; }
.preview-dot.green { background: #22c55e; }

.preview-title {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-left: 8px;
  font-family: var(--font-mono);
}

.preview-body {
  display: grid;
  grid-template-columns: 60px 1fr;
  min-height: 280px;
}

.preview-sidebar {
  background: var(--gray-850);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-logo {
  width: 24px;
  height: 24px;
  background: var(--indigo-500);
  border-radius: 6px;
  margin-bottom: 8px;
}

.preview-line {
  height: 8px;
  border-radius: 4px;
  background: var(--gray-700);
}
.preview-line.active { background: var(--gray-400); }

.preview-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.preview-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.preview-card {
  background: var(--gray-800);
  border-radius: 6px;
  padding: 12px;
  text-align: center;
}
.preview-card span {
  display: block;
  color: white;
  font-size: 1.15rem;
  font-weight: 700;
}
.preview-card small {
  display: block;
  color: var(--gray-400);
  font-size: 0.65rem;
  margin-top: 2px;
}

.preview-chart {
  height: 80px;
  background: linear-gradient(180deg, rgba(99,102,241,0.25) 0%, rgba(99,102,241,0.05) 100%);
  border-radius: 6px;
}

.preview-table {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.preview-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--gray-800);
  color: var(--gray-300);
  font-size: 0.72rem;
}
.preview-row.head {
  color: var(--gray-500);
  text-transform: uppercase;
  font-size: 0.62rem;
  letter-spacing: 0.03em;
}

/* ─── Features ───────────────────────────────────────────────────────────── */

.features {
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 24px 100px;
  text-align: center;
}

.features h2 {
  font-size: 1.6rem;
  margin-bottom: 48px;
  color: var(--gray-900);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  text-align: left;
}

.feature-card {
  background: white;
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.82rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ─── Pricing ────────────────────────────────────────────────────────────── */

.pricing {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 100px;
  text-align: center;
}

.pricing h2 {
  font-size: 1.6rem;
  margin-bottom: 40px;
  color: var(--gray-900);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  text-align: left;
  max-width: 640px;
  margin: 0 auto;
}

.pricing-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  transition: all var(--transition);
}

.pricing-card.featured {
  border-color: var(--indigo-500);
  box-shadow: 0 0 0 1px var(--indigo-500), var(--shadow-lg);
  transform: scale(1.02);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--indigo-600);
  color: white;
  padding: 4px 16px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 20px;
}
.price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--gray-500);
}

.pricing-card ul {
  list-style: none;
  margin-bottom: 24px;
}

.pricing-card li {
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
}
.pricing-card li:last-child { border-bottom: none; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--gray-200);
  padding: 40px 24px;
  margin-top: 40px;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}

.footer-inner strong {
  color: var(--gray-900);
  margin-bottom: 4px;
  display: block;
}

.footer-inner p {
  font-size: 0.82rem;
  color: var(--gray-500);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--gray-500);
}
.footer-links a:hover { color: var(--gray-900); }

/* ─── Live Badge ────────────────────────────────────────────────────────── */

.live-badge {
  font-size: 0.72rem;
  color: #14b8a6;
  font-weight: 500;
  margin-left: 12px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .dashboard-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    flex-direction: row;
    overflow-x: auto;
    padding: 12px 16px;
    gap: 4px;
  }
  .sidebar-link {
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    padding: 8px 12px;
    font-size: 0.8rem;
  }
  .sidebar-link.active { border-bottom-color: var(--indigo-500); border-left: none; }
  .sidebar-new { border-top: none; margin-top: 0; padding-top: 8px; }

  .dashboard-content { padding: 20px 16px; }

  .two-col { grid-template-columns: 1fr; }

  .stat-row { grid-template-columns: 1fr 1fr; }

  .hero h1 { font-size: 2rem; }
  .hero { padding: 60px 16px 48px; }
  .hero-sub { font-size: 1rem; }

  .preview-stats { grid-template-columns: 1fr 1fr; }
  .preview-body { grid-template-columns: 1fr; }
  .preview-sidebar { display: none; }
  .preview-content { padding: 16px; }

  .auth-card { margin: 40px 16px; padding: 28px; }

  .footer-inner { flex-direction: column; align-items: center; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 480px) {
  .stat-row { grid-template-columns: 1fr; }
  .nav-inner { padding: 0 12px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .pricing-grid { grid-template-columns: 1fr; }
}