/* PassKub — Official website
   Clean, minimal, single (green) brand tone. Brand tokens mirror
   design/brand.md exactly — keep them in sync if that file changes. */

:root {
  --icon-green: #4caf50;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-50: #f0fdf4;

  --ink-900: #0b1220;
  --ink-600: #475569;
  --ink-400: #94a3b8;

  --surface: #ffffff;
  --surface-alt: #f7faf8;
  --surface-card: #ffffff;
  --border: #e6ebe8;

  --danger: #ef4444;
  --warn: #f59e0b;
  --ok: #22c55e;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-tap: 150ms;
  --dur-enter: 250ms;
  --dur-page: 350ms;

  --shadow-sm: 0 1px 2px rgba(11, 18, 32, 0.06);
  --shadow-md: 0 8px 24px rgba(11, 18, 32, 0.08);
  --shadow-lg: 0 24px 48px rgba(11, 18, 32, 0.12);

  --header-h: 72px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #0b1220;
    --surface-alt: #0e1524;
    --surface-card: #131c2b;
    --border: #1f2937;
    --ink-900: #f1f5f9;
    --ink-600: #b7c2d0;
    --ink-400: #7c8aa0;
    --green-50: #0f2417;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: "Google Sans Text", "Google Sans", Roboto, "Segoe UI", Arial, sans-serif;
  color: var(--ink-900);
  background: var(--surface);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: "Google Sans", "Google Sans Text", Roboto, "Segoe UI", Arial, sans-serif;
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 var(--space-4);
  color: var(--ink-600);
}

a {
  color: inherit;
}

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

.muted {
  color: var(--ink-600);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--green-600);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 1000;
}
.skip-link:focus {
  left: 0;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.wrap-narrow {
  max-width: 760px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-enter) var(--ease), box-shadow var(--dur-enter) var(--ease);
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-900);
}
.brand-mark {
  border-radius: 8px;
}

.site-nav {
  display: flex;
  gap: var(--space-6);
}
.site-nav a {
  text-decoration: none;
  color: var(--ink-600);
  font-weight: 500;
  font-size: 15px;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--dur-tap) var(--ease);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--green-600);
  border-radius: 2px;
  transition: right var(--dur-enter) var(--ease);
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--ink-900);
}
.site-nav a:hover::after,
.site-nav a.active::after {
  right: 0;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--ink-900);
  transition: transform var(--dur-tap) var(--ease), opacity var(--dur-tap) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-tap) var(--ease), box-shadow var(--dur-tap) var(--ease),
    background var(--dur-tap) var(--ease), border-color var(--dur-tap) var(--ease), opacity var(--dur-tap) var(--ease);
}
.btn:active {
  transform: scale(0.97);
}
.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}
.btn-block {
  width: 100%;
}
.btn-primary {
  background: var(--green-600);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--green-700);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--ink-900);
}
.btn-outline:hover {
  border-color: var(--green-600);
  color: var(--green-600);
}
.btn-ghost {
  background: transparent;
  color: var(--ink-900);
}
.btn-ghost:hover {
  color: var(--green-600);
}
.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 64px 0 40px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-8);
  align-items: center;
}
.eyebrow {
  color: var(--green-600);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 var(--space-3);
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
}
.hero-sub {
  font-size: 17px;
  max-width: 52ch;
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin: var(--space-6) 0 var(--space-6);
}
.trust-strip {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--ink-600);
}
.trust-strip li {
  position: relative;
  padding-left: var(--space-4);
}
.trust-strip li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green-500);
}

.hero-art {
  position: relative;
  min-height: 320px;
}
.hero-glyph {
  position: absolute;
  right: 8%;
  bottom: 0;
  width: 120px;
  opacity: 0.9;
  filter: drop-shadow(var(--shadow-lg));
  animation: floaty 6s ease-in-out infinite;
}
.hero-card {
  position: absolute;
  width: 220px;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4);
  animation: floaty 7s ease-in-out infinite;
}
.hero-card-1 {
  left: 4%;
  top: 6%;
}
.hero-card-2 {
  left: 22%;
  top: 46%;
  animation-delay: 1.2s;
}
.hero-card-row {
  font-size: 13px;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
}
.hero-card-row.muted {
  color: var(--ink-600);
  font-weight: 500;
}
.hero-card-row.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--ink-400);
  letter-spacing: 0.1em;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}
.dot-ok {
  background: var(--ok);
}
.dot-warn {
  background: var(--warn);
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* ---------- Platform strip ---------- */
.platform-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface-alt);
}
.platform-strip-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  font-weight: 600;
  color: var(--ink-600);
  font-size: 14px;
}
.platform-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 250ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity 250ms cubic-bezier(0.22, 1, 0.36, 1);
}
.platform-item img {
  width: 22px;
  height: 22px;
  flex: none;
}
.platform-item:hover {
  transform: translateY(-2px);
  opacity: 0.85;
}
@media (prefers-reduced-motion: reduce) {
  .platform-item {
    transition: none;
  }
  .platform-item:hover {
    transform: none;
  }
}

/* ---------- Sections ---------- */
.section {
  padding: 88px 0;
}
.section-alt {
  background: var(--surface-alt);
}
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-8);
}
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 36px);
}
.section-sub {
  font-size: 16px;
}

.grid {
  display: grid;
  gap: var(--space-6);
}
.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.span-2 {
  grid-column: span 2;
}

.card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: transform var(--dur-enter) var(--ease), box-shadow var(--dur-enter) var(--ease),
    border-color var(--dur-enter) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--green-500) 40%, var(--border));
}

.feature-card h3 {
  font-size: 18px;
}
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--green-50);
  color: var(--green-600);
  margin-bottom: var(--space-4);
}
.feature-icon svg {
  width: 24px;
  height: 24px;
}

/* ---------- Download ---------- */
.version-badge {
  display: inline-block;
  font-weight: 600;
  color: var(--green-600);
}
.platform-card h3 {
  font-size: 20px;
  margin-bottom: var(--space-1);
}
.platform-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.platform-buttons-row {
  gap: var(--space-4);
}
.download-note {
  text-align: center;
  font-size: 13px;
  margin-top: var(--space-2);
}
.download-note code {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 6px;
}

/* ---------- Pricing ---------- */
.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
}
.pricing-head {
  margin-bottom: var(--space-4);
}
.pricing-tagline {
  font-size: 14px;
  margin: 0;
}
.pricing-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
  flex: 1;
}
.pricing-list li {
  padding: 8px 0 8px var(--space-5);
  position: relative;
  font-size: 14.5px;
  color: var(--ink-900);
  border-top: 1px solid var(--border);
}
.pricing-list li:first-child {
  border-top: none;
}
.pricing-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green-600);
  font-weight: 700;
}
.pricing-card-featured {
  border-color: var(--green-600);
  box-shadow: var(--shadow-md);
}
.pricing-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--green-600);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
}

/* ---------- FAQ ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.faq-item {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-4) var(--space-5);
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "+";
  color: var(--green-600);
  font-size: 20px;
  transition: transform var(--dur-enter) var(--ease);
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item p {
  margin: var(--space-3) 0 0;
}

/* ---------- CTA banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--green-600), var(--green-700));
  color: #fff;
  padding: 72px 0;
}
.cta-inner {
  text-align: center;
}
.cta-banner h2 {
  color: #fff;
}
.cta-banner p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: var(--space-6);
}
.cta-banner .btn-primary {
  background: #fff;
  color: var(--green-700);
}
.cta-banner .btn-primary:hover {
  background: var(--green-50);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-top: 56px;
  background: var(--surface-alt);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-8);
  flex-wrap: wrap;
  padding-bottom: 40px;
}
.footer-brand {
  max-width: 280px;
}
.footer-cols {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 120px;
}
.footer-col h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-400);
  margin-bottom: var(--space-1);
}
.footer-col a {
  text-decoration: none;
  color: var(--ink-600);
  font-size: 14px;
  transition: color var(--dur-tap) var(--ease);
}
.footer-col a:hover {
  color: var(--green-600);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px var(--space-6);
  font-size: 13px;
  color: var(--ink-400);
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-card);
  color: var(--ink-900);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--dur-enter) var(--ease), transform var(--dur-enter) var(--ease);
  z-index: 90;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-page) var(--ease), transform var(--dur-page) var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-art {
    min-height: 240px;
    order: -1;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-4) var(--space-6) var(--space-6);
    gap: var(--space-2);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-enter) var(--ease), transform var(--dur-enter) var(--ease);
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-toggle {
    display: flex;
  }
  .header-actions .btn-sm {
    display: none;
  }
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .span-2 {
    grid-column: span 1;
  }
  .platform-buttons-row {
    flex-direction: column;
  }
}