/* Kiwi Network Landing Page
   Material Design inspired, with kiwi-blog colors (content-hue: 100, header-hue: 210)
*/

:root {
  --content-hue: 100;
  --header-hue: 210;

  /* Colors - Light */
  --bg: #fafbfc;
  --bg-alt: #f0f4f8;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: rgba(0, 0, 0, 0.08);

  --text: #1a2b1a;
  --text-secondary: #4a5f4a;
  --text-muted: #6b7c6b;

  --primary: hsl(var(--header-hue), 55%, 45%);
  --primary-dark: hsl(var(--header-hue), 55%, 38%);
  --primary-light: hsl(var(--header-hue), 55%, 92%);

  --accent: hsl(var(--content-hue), 50%, 42%);
  --accent-light: hsl(var(--content-hue), 50%, 92%);

  --master-color: hsl(var(--header-hue), 60%, 50%);
  --node-color: hsl(var(--content-hue), 55%, 45%);
  --ws-color: hsl(280, 50%, 50%);

  --success: #22c55e;
  --danger: #ef4444;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --font-sans: 'Roboto', system-ui, -apple-system, sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, monospace;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --bg-alt: #161b22;
  --surface: #1c2128;
  --surface-alt: #21262d;
  --border: rgba(255, 255, 255, 0.1);

  --text: #e6edf3;
  --text-secondary: #b1bac4;
  --text-muted: #8b949e;

  --primary: hsl(var(--header-hue), 55%, 55%);
  --primary-dark: hsl(var(--header-hue), 55%, 48%);
  --primary-light: hsla(var(--header-hue), 55%, 55%, 0.15);

  --accent: hsl(var(--content-hue), 50%, 55%);
  --accent-light: hsla(var(--content-hue), 50%, 55%, 0.15);

  --master-color: hsl(var(--header-hue), 60%, 60%);
  --node-color: hsl(var(--content-hue), 55%, 55%);
  --ws-color: hsl(280, 50%, 60%);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

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

html {
  scroll-behavior: smooth;
}

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

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* App Bar */
.appbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.appbar__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.appbar__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 600;
  font-size: 1.125rem;
}

.appbar__brand:hover {
  text-decoration: none;
}

.appbar__logo {
  font-size: 1.5rem;
}

.appbar__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.nav__link {
  padding: 0.5rem 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
}

.nav__link:hover {
  background: var(--bg-alt);
  color: var(--text);
  text-decoration: none;
}

.nav__link--icon {
  padding: 0.5rem;
  display: flex;
  align-items: center;
}

.appbar__toggle {
  margin-left: 0.5rem;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.appbar__toggle:hover {
  background: var(--bg-alt);
}

.icon-sun { display: block; }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.appbar__menu {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  margin-left: auto;
}

.appbar__menu span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Drawer */
.drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
}

.drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: min(300px, 85vw);
  height: 100vh;
  background: var(--surface);
  z-index: 210;
  transform: translateX(-100%);
  transition: transform 0.2s ease;
  display: flex;
  flex-direction: column;
}

.drawer[data-open="true"] {
  transform: translateX(0);
}

.drawer__header {
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.drawer__title {
  font-weight: 600;
}

.drawer__close {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}

.drawer__close:hover {
  background: var(--bg-alt);
}

.drawer__nav {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
}

.drawer__link {
  padding: 0.875rem 1rem;
  color: var(--text);
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.drawer__link:hover {
  background: var(--bg-alt);
  text-decoration: none;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.hero__title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin: 0 0 1.5rem;
}

.hero__highlight {
  font-size: 1.125rem;
  color: var(--text);
  background: var(--accent-light);
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent);
  margin: 0 0 2rem;
}

.hero__highlight strong {
  color: var(--accent);
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}

.btn--primary {
  background: var(--primary);
  color: white;
}

.btn--primary:hover {
  background: var(--primary-dark);
  text-decoration: none;
}

.btn--outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn--outline:hover {
  background: var(--bg-alt);
  border-color: var(--text-muted);
  text-decoration: none;
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* Hero Diagram */
.diagram--hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.diagram__cloud {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
}

.diagram__cloud svg {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

.diagram__label {
  font-size: 0.8125rem;
  font-weight: 500;
}

.diagram__arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0;
}

.diagram__arrow::before {
  content: '';
  width: 2px;
  height: 24px;
  background: var(--border);
}

.diagram__arrow::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--border);
}

.diagram__arrow span {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--surface);
  padding: 0.125rem 0.5rem;
  position: relative;
  z-index: 1;
}

.diagram__box {
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  text-align: center;
  min-width: 140px;
}

.diagram__box strong {
  display: block;
  font-size: 0.9375rem;
}

.diagram__box small {
  font-size: 0.75rem;
  opacity: 0.8;
}

.diagram__box--master {
  background: var(--primary-light);
  color: var(--master-color);
  border: 2px solid var(--master-color);
}

.diagram__box--node {
  background: var(--accent-light);
  color: var(--node-color);
  border: 2px solid var(--node-color);
}

.diagram__box--ws {
  background: hsla(280, 50%, 50%, 0.1);
  color: var(--ws-color);
  border: 2px solid var(--ws-color);
}

.diagram__row {
  display: flex;
  gap: 1rem;
}

/* Section Styles */
.section__title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  text-align: center;
}

.section__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin: 0 0 3rem;
  text-align: center;
}

/* Features Section */
.features {
  padding: 5rem 0;
  background: var(--bg-alt);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.feature-card__icon svg {
  width: 28px;
  height: 28px;
}

.feature-card__icon--master {
  background: var(--primary-light);
  color: var(--master-color);
}

.feature-card__icon--node {
  background: var(--accent-light);
  color: var(--node-color);
}

.feature-card__icon--ws {
  background: hsla(280, 50%, 50%, 0.1);
  color: var(--ws-color);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  margin: 0 0 1rem;
  font-size: 0.9375rem;
}

.feature-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-card__list li {
  position: relative;
  padding-left: 1.25rem;
  margin: 0.375rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.feature-card__list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* Architecture Section */
.architecture {
  padding: 5rem 0;
}

.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.arch-diagram__container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 700px;
  margin: 0 auto;
}

.arch-layer {
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
}

.arch-layer__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

.arch-layer__content {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.arch-layer--internet {
  background: linear-gradient(135deg, #f0f4f8 0%, #e8ecf0 100%);
  border: 1px dashed var(--border);
}

[data-theme="dark"] .arch-layer--internet {
  background: linear-gradient(135deg, #1c2128 0%, #21262d 100%);
}

.arch-layer--master {
  background: var(--primary-light);
  border: 2px solid var(--master-color);
}

.arch-layer--node {
  background: var(--accent-light);
  border: 2px solid var(--node-color);
}

.arch-layer--ws {
  background: hsla(280, 50%, 50%, 0.08);
  border: 2px solid var(--ws-color);
}

.arch-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  min-width: 100px;
}

.arch-node span {
  font-size: 0.8125rem;
  font-weight: 500;
}

.arch-node--attacker {
  opacity: 0.5;
  border-style: dashed;
}

.arch-arrows {
  display: flex;
  justify-content: center;
  gap: 3rem;
  padding: 0.5rem 0;
}

.arch-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.arch-arrow::before {
  content: '';
  width: 2px;
  height: 20px;
}

.arch-arrow::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
}

.arch-arrow--allowed::before { background: var(--success); }
.arch-arrow--allowed::after { border-top: 6px solid var(--success); }

.arch-arrow--blocked::before { background: var(--danger); opacity: 0.4; }
.arch-arrow--blocked::after { border-top: 6px solid var(--danger); opacity: 0.4; }

.arch-arrow span {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
}

.arch-arrow--allowed span {
  background: hsla(142, 71%, 45%, 0.15);
  color: var(--success);
}

.arch-arrow--blocked span {
  background: hsla(0, 84%, 60%, 0.1);
  color: var(--danger);
  opacity: 0.6;
}

.arch-service {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 0.875rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.arch-service__name {
  font-size: 0.8125rem;
  font-weight: 600;
}

.arch-service__port {
  font-size: 0.6875rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.arch-tunnel {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}

.arch-tunnel__line {
  flex: 1;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--primary) 0,
    var(--primary) 8px,
    transparent 8px,
    transparent 12px
  );
  border-radius: 2px;
}

.arch-tunnel__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--primary);
  white-space: nowrap;
}

.arch-device {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.arch-device span {
  font-size: 0.75rem;
  font-weight: 500;
}

.arch-legend {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.arch-legend__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.arch-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.arch-legend__dot--green { background: var(--success); }
.arch-legend__dot--red { background: var(--danger); opacity: 0.5; }
.arch-legend__dot--blue { background: var(--primary); }

/* Federation Section */
.federation {
  padding: 5rem 0;
  background: var(--bg-alt);
}

.fed-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.fed-network {
  text-align: center;
}

.fed-network__label {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

.fed-network__box {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  min-width: 160px;
}

.fed-network--a .fed-network__box {
  border-color: var(--master-color);
}

.fed-network--b .fed-network__box {
  border-color: var(--node-color);
}

.fed-network__master {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.fed-network__nodes {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.fed-network__nodes span {
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--bg-alt);
  border-radius: 4px;
  color: var(--text-muted);
}

.fed-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  min-width: 100px;
}

.fed-link__line {
  width: 80px;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--primary) 0,
    var(--primary) 6px,
    transparent 6px,
    transparent 10px
  );
}

.fed-link__label {
  font-size: 0.6875rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.fed-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.fed-feature {
  text-align: center;
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.fed-feature strong {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.fed-feature p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* CTA Section */
.cta-section {
  padding: 5rem 0;
  text-align: center;
}

.cta-section h2 {
  font-size: 2rem;
  margin: 0 0 0.75rem;
}

.cta-section p {
  color: var(--text-secondary);
  margin: 0 0 2rem;
  font-size: 1.125rem;
}

.cta-section__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.footer__brand {
  font-size: 1.125rem;
  font-weight: 600;
}

.footer__brand p {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer__links a:hover {
  color: var(--text);
}

.footer__copy {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 2.5rem 1.5rem;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__visual {
    order: -1;
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .fed-diagram {
    flex-direction: column;
  }

  .fed-link {
    transform: rotate(90deg);
    margin: 0.5rem 0;
  }

  .fed-features {
    grid-template-columns: 1fr;
  }

  .arch-legend {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .footer__content {
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    text-align: center;
  }

  .footer__links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .appbar__nav {
    display: none;
  }

  .appbar__menu {
    display: flex;
  }

  .diagram__row {
    flex-direction: column;
  }

  .arch-arrows {
    flex-direction: column;
    gap: 1rem;
  }

  .arch-layer__content {
    gap: 0.5rem;
  }
}