/* ALKARTIS — Design System v1.0
   Principles: Calm Intelligence, Whitespace as Trust, Information is Beautiful, Motion Should Explain */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Color */
  --obsidian: #0F172A;
  --surface: #FFFFFF;
  --surface-secondary: #F8FAFC;
  --border: #E2E8F0;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #64748B;
  --accent: #4F46E5;
  --accent-soft: #EEF2FF;
  --success: #16A34A;
  --warning: #F59E0B;
  --danger: #DC2626;
  --info: #2563EB;

  /* Type */
  --font-display: 'Inter', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Shadow */
  --shadow-1: 0 2px 12px rgba(15, 23, 42, 0.06);

  /* Grid */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --space-12: 96px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--obsidian);
}

.nav-logo { height: 24px; width: auto; display: block; }
.footer-mark { height: 20px; width: auto; display: block; }

.nav-links {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.nav-links a:hover, .nav-links a.active { color: var(--obsidian); }

.nav-cta {
  padding: 8px 16px;
  background: var(--obsidian);
  color: white !important;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
}

.nav-cta:hover { background: var(--accent); }

/* ---------- Nav dropdown ---------- */
.nav-item-dropdown { position: relative; }

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0;
}

.nav-dropdown-trigger:hover, .nav-dropdown-trigger.active-page { color: var(--obsidian); }

.nav-dropdown-trigger svg { transition: transform 0.15s ease; }

.nav-item-dropdown.open .nav-dropdown-trigger svg { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  margin-top: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  padding: 8px;
  min-width: 220px;
  display: none;
  z-index: 200;
}

.nav-item-dropdown.open .nav-dropdown-menu,
.nav-item-dropdown:focus-within .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.nav-dropdown-menu a:hover { background: var(--surface-secondary); color: var(--obsidian); }

.nav-dropdown-menu .dropdown-overview {
  font-weight: 600;
  color: var(--obsidian);
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
  padding-bottom: 12px;
}

@media (max-width: 900px) {
  .nav-dropdown-menu { position: static; transform: none; box-shadow: none; border: none; padding: 4px 0 4px 12px; min-width: 0; }
  .nav-item-dropdown.open .nav-dropdown-menu { display: block; }
}

/* ---------- Mobile hamburger nav ---------- */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--obsidian);
}

.nav-hamburger svg .line-mid { transition: opacity 0.15s ease; }
.nav-hamburger svg .line-top, .nav-hamburger svg .line-bot { transition: transform 0.15s ease; transform-origin: center; }
.nav.mobile-open .nav-hamburger svg .line-mid { opacity: 0; }
.nav.mobile-open .nav-hamburger svg .line-top { transform: translateY(6px) rotate(45deg); }
.nav.mobile-open .nav-hamburger svg .line-bot { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px var(--space-4) 20px;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }

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

  .nav-links > a, .nav-item-dropdown { width: 100%; }

  .nav-links > a {
    padding: 12px 0;
    border-bottom: 1px solid var(--surface-secondary);
  }

  .nav-cta { display: inline-block; margin-top: 8px; }

  .nav-dropdown-trigger {
    width: 100%;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--surface-secondary);
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-display);
  transition: all 0.15s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #4338CA; }

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

.btn-tertiary { color: var(--text-secondary); padding: 12px 4px; }
.btn-tertiary:hover { color: var(--obsidian); }

/* ---------- Typography ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}

h1, h2, h3 { font-family: var(--font-display); color: var(--obsidian); letter-spacing: -0.02em; }
.h-display { font-size: 56px; font-weight: 700; line-height: 1.08; }
.h1 { font-size: 42px; font-weight: 700; line-height: 1.15; }
.h2 { font-size: 32px; font-weight: 600; line-height: 1.2; }
.h3 { font-size: 24px; font-weight: 600; line-height: 1.3; }
.body-lg { font-size: 18px; color: var(--text-secondary); line-height: 1.65; }
.body { font-size: 16px; color: var(--text-secondary); }
.small { font-size: 14px; color: var(--text-tertiary); }
.caption { font-size: 12px; color: var(--text-tertiary); }
.mono { font-family: var(--font-mono); }

@media (max-width: 720px) {
  .h-display { font-size: 36px; }
  .h1 { font-size: 30px; }
  .h2 { font-size: 26px; }
}

/* ---------- Sections ---------- */
section { padding: var(--space-12) 0; }
.section-border { border-top: 1px solid var(--border); }
.section-tight { padding: var(--space-8) 0; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover { box-shadow: var(--shadow-1); border-color: #CBD5E1; }

.card-secondary { background: var(--surface-secondary); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 500;
}

.tag-live { background: #ECFDF5; color: var(--success); }
.tag-dev { background: #FFFBEB; color: var(--warning); }
.tag-roadmap { background: var(--surface-secondary); color: var(--text-tertiary); }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- Graph signature element ---------- */
.graph-node { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.graph-node.active { fill: var(--accent-soft); stroke: var(--accent); }
.graph-line { stroke: var(--border); stroke-width: 1; }
.graph-line.active { stroke: var(--accent); stroke-width: 1.25; opacity: 0.5; }
.graph-label { font-family: var(--font-mono); font-size: 11px; fill: var(--text-tertiary); }

/* ---------- Grid layouts ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }

@media (max-width: 800px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- Focus ---------- */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Banners & backgrounds (geometric, not photographic) ---------- */
.banner {
  position: relative;
  overflow: hidden;
  background: var(--obsidian);
  background-image:
    radial-gradient(circle at 15% 20%, rgba(79,70,229,0.35), transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(79,70,229,0.25), transparent 45%),
    linear-gradient(180deg, #0F172A 0%, #111C33 100%);
}

.banner-grid {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(226,232,240,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226,232,240,0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.banner-content { position: relative; z-index: 1; }

.banner-dark-eyebrow { color: #A5B4FC; }
.banner-dark h1, .banner-dark h2 { color: white; }
.banner-dark p { color: #CBD5E1; }

.dotgrid-bg {
  background-image: radial-gradient(rgba(15,23,42,0.08) 1px, transparent 1px);
  background-size: 22px 22px;
}

/* ---------- Carousel ---------- */
.carousel {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: var(--space-2);
  scrollbar-width: thin;
}

.carousel::-webkit-scrollbar { height: 6px; }
.carousel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.carousel-card {
  scroll-snap-align: start;
  flex: 0 0 300px;
  min-height: 200px;
}

.carousel-controls {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.carousel-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.carousel-btn:hover { border-color: var(--obsidian); color: var(--obsidian); }

/* ---------- Pricing ---------- */
.grid-pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  align-items: stretch;
}

@media (max-width: 900px) {
  .grid-pricing { grid-template-columns: 1fr; }
}

.price-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: white;
}

.price-card.featured {
  border-color: var(--accent);
  box-shadow: var(--shadow-1);
  position: relative;
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 500;
  color: var(--obsidian);
  margin-top: 12px;
}

.price-period {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-tertiary);
}

.price-feature-list {
  list-style: none;
  margin-top: var(--space-3);
  flex-grow: 1;
}

.price-feature-list li {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 7px 0;
  border-top: 1px solid var(--surface-secondary);
}

.price-feature-list li:first-child { border-top: none; }

/* ---------- Pricing comparison table ---------- */
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.pricing-table th, .pricing-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.pricing-table th {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--obsidian);
  font-size: 13px;
}

.pricing-table td:not(:first-child), .pricing-table th:not(:first-child) {
  text-align: center;
}

.pricing-table td:first-child { color: var(--text-secondary); }

.pricing-table .yes { color: var(--success); font-weight: 600; }
.pricing-table .no { color: var(--text-tertiary); }

@media (max-width: 700px) {
  .pricing-table { font-size: 12px; }
  .pricing-table th, .pricing-table td { padding: 10px 8px; }
}

/* ---------- FAQ ---------- */
.faq-item { border-top: 1px solid var(--border); padding: 20px 0; }
.faq-item:first-child { border-top: none; }
.faq-q { font-family: var(--font-display); font-weight: 600; color: var(--obsidian); font-size: 16px; }
.faq-a { margin-top: 8px; color: var(--text-secondary); font-size: 15px; line-height: 1.65; }

/* ---------- Hero product mockup ---------- */
.hero-glow {
  position: absolute;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,70,229,0.45) 0%, transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.mockup-window {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 24px 64px rgba(0,0,0,0.35), 0 4px 16px rgba(0,0,0,0.2);
  overflow: hidden;
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-secondary);
}

.mockup-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border); }

.mockup-body { padding: var(--space-3); }

.mockup-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}

.mockup-row + .mockup-row { margin-top: 4px; }
.mockup-row:hover { background: var(--surface-secondary); }

.mockup-name { font-size: 13px; font-weight: 600; color: var(--text-primary); }
.mockup-dept { font-size: 11px; color: var(--text-tertiary); font-family: var(--font-mono); }
.mockup-amount { font-family: var(--font-mono); font-size: 13px; font-weight: 500; }
.mockup-delta-up { color: var(--success); font-family: var(--font-mono); font-size: 11px; }
.mockup-delta-down { color: var(--text-tertiary); font-family: var(--font-mono); font-size: 11px; }

/* ---------- Stats bar ---------- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}

@media (max-width: 800px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 500;
  color: var(--obsidian);
}

/* ---------- Feature icons ---------- */
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

/* ---------- Fade-in on load ---------- */
.fade-in {
  animation: fadeInUp 0.7s ease both;
}

.fade-in-delay-1 { animation-delay: 0.08s; }
.fade-in-delay-2 { animation-delay: 0.16s; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .fade-in { animation: none; }
}

/* ---------- Closing CTA banner ---------- */
.cta-banner {
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  text-align: center;
}

/* ---------- Blog ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

@media (max-width: 900px) {
  .blog-grid { grid-template-columns: 1fr; }
}

.blog-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.blog-card:hover { box-shadow: var(--shadow-1); border-color: #CBD5E1; }

.blog-thumb {
  aspect-ratio: 16 / 10;
  background: var(--obsidian);
  position: relative;
  overflow: hidden;
}

.blog-thumb svg { width: 100%; height: 100%; display: block; }

.blog-card-body { padding: var(--space-3); }

.blog-featured {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-4);
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (max-width: 800px) {
  .blog-featured { grid-template-columns: 1fr; }
}

.blog-featured .blog-thumb { aspect-ratio: 4/3; }

/* Article prose */
.prose { max-width: 680px; margin: 0 auto; }
.prose p { font-size: 17px; color: var(--text-secondary); line-height: 1.75; margin-top: 20px; }
.prose h2 { font-size: 26px; margin-top: 44px; margin-bottom: 4px; }
.prose h3 { font-size: 20px; margin-top: 32px; margin-bottom: 4px; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 32px 0;
  font-size: 20px;
  font-weight: 500;
  color: var(--obsidian);
  font-family: var(--font-display);
}
.prose .lede { font-size: 20px; color: var(--text-secondary); }
.article-meta { display:flex; gap: 16px; align-items:center; color: var(--text-tertiary); font-size: 14px; }
.article-hero { border-radius: var(--radius-md); overflow: hidden; margin: var(--space-4) 0; background: var(--obsidian); }
.article-hero svg { width: 100%; height: auto; display: block; }

/* ---------- Founder letter ---------- */
.letter-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  background: var(--surface-secondary);
}

.letter-signature {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: var(--space-4);
}

.letter-signature img { height: 22px; width: auto; }