/* UpDown landing — editorial split-pane aesthetic */

:root {
  --ink: #14141f;
  --ink-soft: #3d3d52;
  --paper: #f7f6f3;
  --paper-elevated: #ffffff;
  --line: #e4e2dc;
  --teal: #0b7c74;
  --teal-bright: #12a89c;
  --coral: #d94f3d;
  --shadow: 0 24px 64px rgba(20, 20, 31, 0.09);
  --radius: 14px;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Sora", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--teal-bright);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--teal-bright);
  outline-offset: 3px;
}

/* Layout */

.container {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 246, 243, 0.88);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(20, 20, 31, 0.12);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--ink);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.25rem;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 10px 24px rgba(20, 20, 31, 0.18);
}

.btn-primary:hover {
  background: #252538;
  color: #fff;
}

.btn-secondary {
  background: var(--paper-elevated);
  color: var(--ink);
  border-color: var(--line);
}

.btn-secondary:hover {
  background: #fff;
  color: var(--ink);
}

/* Hero */

.hero {
  padding-block: 4.5rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto;
  height: 70%;
  background:
    radial-gradient(ellipse 60% 50% at 20% 40%, rgba(18, 168, 156, 0.14), transparent 70%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(217, 79, 61, 0.1), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: linear-gradient(90deg, var(--teal), var(--coral));
  border-radius: 2px;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero h1 em {
  font-style: italic;
  color: var(--teal);
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34ch;
  font-size: 1.12rem;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-visual {
  position: relative;
}

.hero-shot {
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.split-badge {
  position: absolute;
  left: -0.75rem;
  bottom: 1.25rem;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  background: var(--paper-elevated);
  border: 1px solid var(--line);
  font-size: 0.78rem;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(20, 20, 31, 0.08);
}

.split-badge strong {
  color: var(--teal);
}

/* Sections */

section {
  padding-block: 4rem;
}

.section-head {
  margin-bottom: 2.5rem;
}

.section-head h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  max-width: 52ch;
  color: var(--ink-soft);
}

/* Feature pillars */

.pillars {
  display: grid;
  gap: 1rem;
}

@media (min-width: 700px) {
  .pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--paper-elevated);
  border: 1px solid var(--line);
}

.pillar-icon {
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: 1rem;
  color: var(--teal);
}

.pillar h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.pillar p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* Feature grid */

.feature-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: 1.25rem 1.35rem;
  border-radius: calc(var(--radius) - 2px);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  border-color: #cfcbc2;
  transform: translateY(-2px);
}

.feature-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

/* Screenshots */

.shot-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .shot-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

figure {
  margin: 0;
}

figure img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: 0 12px 32px rgba(20, 20, 31, 0.06);
}

figcaption {
  margin-top: 0.65rem;
  text-align: center;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

/* Platform cards */

.platforms {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 800px) {
  .platforms {
    grid-template-columns: 1fr 1fr;
  }
}

.platform-card {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: var(--paper-elevated);
  border: 1px solid var(--line);
}

.platform-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.platform-card p {
  margin: 0 0 1.25rem;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.platform-card ul {
  margin: 0 0 1.25rem;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.platform-card li + li {
  margin-top: 0.35rem;
}

/* Install */

.install-box {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: var(--paper-elevated);
  border: 1px solid var(--line);
}

.install-steps {
  margin: 0;
  padding-left: 1.25rem;
}

.install-steps li {
  margin-bottom: 0.75rem;
}

.install-steps li:last-child {
  margin-bottom: 0;
}

.note {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-radius: calc(var(--radius) - 4px);
  background: #fff8ed;
  border: 1px solid #f0dfc0;
  font-size: 0.88rem;
  color: #5c4a2a;
}

.note strong {
  display: block;
  margin-bottom: 0.35rem;
}

.note pre {
  margin: 0.65rem 0 0;
  padding: 0.75rem;
  overflow-x: auto;
  border-radius: 8px;
  background: #fff3dc;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* CTA band */

.cta-band {
  margin-block: 1rem 4rem;
  padding: 2.5rem 2rem;
  border-radius: calc(var(--radius) + 6px);
  text-align: center;
  background: linear-gradient(135deg, var(--ink) 0%, #252538 55%, #1a3040 100%);
  color: #fff;
  box-shadow: var(--shadow);
}

.cta-band h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.cta-band p {
  margin: 0 0 1.5rem;
  color: rgba(255, 255, 255, 0.78);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--ink);
}

.cta-band .btn-primary:hover {
  background: #f2f2f7;
  color: var(--ink);
}

.cta-band .btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.cta-band .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-align: center;
}

.site-footer p {
  margin: 0.35rem 0;
}

.site-footer a {
  color: inherit;
}

/* Reveal animation */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 699px) {
  .nav-links a:not(.btn) {
    display: none;
  }
}