/* =========================================
   INBOXAGENT — DESIGN SYSTEM
   ========================================= */

:root {
  --bg: #0e0e0e;
  --surface: #171717;
  --surface-2: #1f1f1f;
  --border: #2a2a2a;
  --fg: #f5f5f0;
  --fg-muted: #888;
  --fg-dim: #555;
  --accent: #f59e0b;
  --accent-dim: #b45309;
  --resolved: #22c55e;
  --escalated: #ef4444;
  --replied: #3b82f6;

  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans: 'DM Sans', system-ui, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0.4;
}

/* ---- NAV ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14,14,14,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.nav-tagline {
  font-size: 0.8rem;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ---- HERO ---- */
.hero {
  padding: var(--space-10) var(--space-6) var(--space-8);
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
}
.hero-headline em {
  font-style: italic;
  color: var(--accent);
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 460px;
  margin-bottom: var(--space-7);
}
.hero-stat-row {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.hero-stat-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--fg);
}
.hero-stat-label {
  font-size: 0.75rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hero-stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Email stack */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.email-stack {
  position: relative;
  width: 320px;
}
.email-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-4) var(--space-5);
  position: absolute;
  width: 300px;
  transition: transform 0.3s ease;
}
.email-card-1 {
  top: 0;
  left: 20px;
  transform: rotate(-3deg);
  z-index: 1;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.email-card-2 {
  top: 70px;
  left: 0;
  transform: rotate(1deg);
  z-index: 2;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.email-card-3 {
  top: 140px;
  left: 30px;
  transform: rotate(-1.5deg);
  z-index: 3;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}
.email-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
}
.email-from {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--fg);
}
.email-time {
  font-size: 0.72rem;
  color: var(--fg-dim);
}
.email-subject {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 4px;
}
.email-preview {
  font-size: 0.75rem;
  color: var(--fg-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.email-status {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: var(--space-2);
}
.email-status.resolved { background: rgba(34,197,94,0.15); color: var(--resolved); }
.email-status.escalated { background: rgba(239,68,68,0.15); color: var(--escalated); }
.email-status.replied { background: rgba(59,130,246,0.15); color: var(--replied); }

.hero-badge {
  position: absolute;
  bottom: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: var(--space-2) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  color: var(--fg-muted);
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--resolved);
  box-shadow: 0 0 6px var(--resolved);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ---- PROOF ---- */
.proof {
  padding: var(--space-7) var(--space-6);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.proof-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.proof-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
  margin-bottom: var(--space-5);
}
.proof-types {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.proof-type {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}
.proof-icon {
  width: 36px;
  height: 36px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.proof-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.proof-desc {
  font-size: 0.82rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ---- FEATURES ---- */
.features {
  padding: var(--space-10) var(--space-6);
}
.features-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-8);
}
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}
.feature {
  background: var(--bg);
  padding: var(--space-7);
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}
.feature-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--accent);
  opacity: 0.4;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}
.feature-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.feature-desc {
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ---- MANIFESTO ---- */
.manifesto {
  padding: var(--space-10) var(--space-6);
  background: var(--surface);
}
.manifesto-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.manifesto-quote {
  max-width: 780px;
}
.manifesto-text {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: var(--space-5);
}
.manifesto-sub {
  font-size: 1rem;
  color: var(--fg-muted);
  font-style: italic;
}

/* ---- CLOSING ---- */
.closing {
  padding: var(--space-10) var(--space-6);
}
.closing-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}
.closing-headline {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
}
.closing-sub {
  font-size: 1rem;
  color: var(--fg-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* ---- FOOTER ---- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-7) var(--space-6);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 1rem;
  display: block;
  margin-bottom: var(--space-2);
}
.footer-desc {
  font-size: 0.78rem;
  color: var(--fg-dim);
  max-width: 280px;
}
.footer-links {
  display: flex;
  gap: var(--space-5);
}
.footer-link {
  font-size: 0.78rem;
  color: var(--fg-muted);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }
  .hero-visual { display: none; }
  .proof-types {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}
@media (max-width: 600px) {
  .hero { padding: var(--space-8) var(--space-4) var(--space-6); }
  .features, .manifesto, .closing { padding: var(--space-8) var(--space-4); }
  .proof { padding: var(--space-6) var(--space-4); }
  .footer { padding: var(--space-6) var(--space-4); }
  .hero-stat-row { flex-wrap: wrap; gap: var(--space-4); }
  .hero-stat-divider { display: none; }
  .email-card { width: 260px; }
}