/* Paper Plane landing — GitHub Pages */

:root {
  --blue-600: #3086ff;
  --blue-500: #3387ff;
  --blue-300: #a1a6ff;
  --blue-100: #bbe2ff;
  --sky-top: #e8f4ff;
  --sky-mid: #d4e9ff;
  --sky-low: #f0f7ff;
  --ink: #0f1a2e;
  --ink-muted: #4a5d78;
  --panel-bg: #f8f9fb;
  --panel-border: #e2e8f0;
  --panel-surface: #ffffff;
  --panel-muted: #94a3b8;
  --radius: 0.625rem;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Outfit", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--sky-low);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--blue-600);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--blue-500);
}

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

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(187, 226, 255, 0.7), transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(161, 166, 255, 0.25), transparent 55%),
    linear-gradient(165deg, var(--sky-top) 0%, var(--sky-mid) 45%, var(--sky-low) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233086FF' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 5vw, 4rem);
  max-width: 36rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
  animation: brand-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.brand__icon {
  width: clamp(2.75rem, 6vw, 3.5rem);
  height: clamp(2.75rem, 6vw, 3.5rem);
  animation: plane-float 4s ease-in-out 0.8s infinite;
}

.brand__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5.5vw, 3.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
}

.hero__headline {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.25;
  color: var(--ink);
  animation: fade-up 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.15s both;
}

.hero__tagline {
  margin: 0 0 2rem;
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--ink-muted);
  max-width: 28ch;
  animation: fade-up 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.25s both;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  animation: fade-up 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.35s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-300));
  border: none;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 12px rgba(48, 134, 255, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(48, 134, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary svg {
  width: 1.125rem;
  height: 1.125rem;
}

.link-secondary {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.link-secondary:hover {
  color: var(--blue-600);
}

/* ── Panel mock (hero visual) ───────────────────────── */

.hero__visual {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  min-height: 100%;
  animation: panel-in 1s cubic-bezier(0.22, 1, 0.36, 1) 0.2s both;
}

.panel-mock {
  position: relative;
  width: min(420px, 100%);
  margin: 0;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border-left: 1px solid var(--panel-border);
  box-shadow: -24px 0 80px rgba(15, 26, 46, 0.08);
  min-height: 100svh;
}

.panel-mock__chrome {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--panel-surface);
  border-bottom: 1px solid var(--panel-border);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink-muted);
}

.panel-mock__chrome img {
  width: 1.125rem;
  height: 1.125rem;
}

.panel-mock__nav {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  background: var(--panel-surface);
  border-bottom: 1px solid var(--panel-border);
  overflow-x: auto;
}

.panel-mock__nav-item {
  flex-shrink: 0;
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--panel-muted);
  border-radius: calc(var(--radius) - 2px);
  white-space: nowrap;
}

.panel-mock__nav-item--active {
  color: var(--blue-600);
  background: rgba(48, 134, 255, 0.1);
}

.panel-mock__body {
  flex: 1;
  padding: 1rem;
  overflow: hidden;
}

.panel-mock__section-title {
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--panel-muted);
}

.panel-mock__list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.panel-mock__list li {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0;
  font-size: 0.8125rem;
  color: var(--ink);
  border-bottom: 1px solid var(--panel-border);
}

.panel-mock__list li:last-child {
  border-bottom: none;
}

.panel-mock__dot {
  flex-shrink: 0;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--panel-muted);
  opacity: 0.5;
}

.panel-mock__dot--blue {
  background: var(--blue-600);
  opacity: 1;
}

.panel-mock__dot--green {
  background: #22c55e;
  opacity: 1;
}

.panel-mock__time {
  margin-left: auto;
  font-size: 0.6875rem;
  color: var(--panel-muted);
}

.panel-mock__tab-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0;
  font-size: 0.8125rem;
  color: var(--ink);
  border-bottom: 1px solid var(--panel-border);
}

.panel-mock__favicon {
  width: 1rem;
  height: 1rem;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--blue-100), var(--blue-300));
  flex-shrink: 0;
}

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

.features {
  padding: clamp(4rem, 10vw, 6rem) clamp(1.5rem, 5vw, 4rem);
  max-width: 52rem;
  margin: 0 auto;
}

.features__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  font-weight: 500;
  letter-spacing: -0.015em;
}

.features__lead {
  margin: 0 0 2.5rem;
  color: var(--ink-muted);
  max-width: 40ch;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.75rem;
}

.feature-list li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem 1.5rem;
  align-items: baseline;
}

.feature-list__label {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue-600);
}

.feature-list__desc {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

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

.site-footer {
  padding: 2.5rem clamp(1.5rem, 5vw, 4rem) 3rem;
  border-top: 1px solid rgba(48, 134, 255, 0.12);
  background: var(--sky-low);
}

.site-footer__inner {
  max-width: 52rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links a {
  font-size: 0.875rem;
  color: var(--ink-muted);
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--blue-600);
}

.site-footer__copy {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--panel-muted);
}

/* ── Legal pages ────────────────────────────────────── */

.legal-page {
  max-width: 42rem;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 5vw, 4rem) 4rem;
}

.legal-page h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.legal-page .meta {
  margin: 0 0 2rem;
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.legal-page h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.legal-page p,
.legal-page li {
  color: var(--ink-muted);
  font-size: 0.9375rem;
}

.legal-page ul {
  padding-left: 1.25rem;
}

.legal-page a {
  color: var(--blue-600);
}

.legal-back {
  display: inline-block;
  margin-bottom: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-muted);
  text-decoration: none;
}

.legal-back:hover {
  color: var(--blue-600);
}

/* ── Animations ─────────────────────────────────────── */

@keyframes brand-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes plane-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

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

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    min-height: auto;
  }

  .hero__content {
    max-width: none;
    padding-bottom: 1rem;
  }

  .hero__visual {
    justify-content: center;
    padding: 0 1rem 2rem;
  }

  .panel-mock {
    width: 100%;
    max-width: 380px;
    min-height: 420px;
    border: 1px solid var(--panel-border);
    border-radius: var(--radius);
    box-shadow: 0 24px 60px rgba(15, 26, 46, 0.1);
  }

  .feature-list li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}