:root {
  --bg: #edf2f8;
  --bg-deep: #d9e2ef;
  --text: #1c222b;
  --muted: #626d7b;
  --line: #cad3de;
  --card: #ffffffde;
  --soft-card: #f4f7fbf5;
  --primary: #7ca3d8;
  --primary-hover: #6e98d2;
  --warn-bg: #f2eddb;
  --warn-line: #d7cfad;
  --shadow-lg: 0 20px 40px rgba(18, 35, 60, 0.12);
  --shadow-md: 0 8px 20px rgba(16, 34, 58, 0.11);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  position: relative;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 50% -80px, #f7fbff 0%, transparent 72%),
    radial-gradient(700px 400px at 50% 100%, #e8eef7 0%, transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  padding: 30px 18px 32px;
}

.page-vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    circle at center,
    transparent 28%,
    rgba(0, 0, 0, 0.14) 140%
  );
}

.masthead,
.canvas,
.site-footer {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
}

.masthead {
  text-align: center;
}

.top-nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.top-nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #f8fbff;
  color: #344254;
  text-decoration: none;
  transition:
    transform 120ms ease,
    background-color 120ms ease;
}

.top-nav-link:hover {
  transform: translateY(-1px);
  background: #f1f7ff;
}

.top-nav-icon {
  flex: 0 0 auto;
}

.brand-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.app-icon {
  width: 23px;
  height: 23px;
  border-radius: 6px;
}

h1 {
  margin: 0;
  font-size: 1.98rem;
  font-weight: 620;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.97rem;
}

.canvas {
  margin-top: 12px;
}

.hero {
  text-align: center;
}

.hero h2 {
  margin: 18px 0 16px;
  font-size: clamp(2rem, 4.1vw, 3.15rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 590;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 11px 20px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 560;
  border: 1px solid transparent;
  transition:
    transform 130ms ease,
    background-color 130ms ease;
}

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

.button-primary {
  background: linear-gradient(180deg, #93b5e4 0%, var(--primary) 100%);
  color: #fff;
  box-shadow: 0 8px 18px rgba(87, 127, 182, 0.34);
}

.button-primary:hover {
  background: linear-gradient(180deg, #8dadde 0%, var(--primary-hover) 100%);
}

.button-subtle {
  border-color: var(--line);
  color: #33404f;
  background: #f8fbff;
}

.trust-line {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.hero-warning {
  margin: 10px auto 0;
  max-width: 540px;
  border-radius: 10px;
  padding: 8px 10px;
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  color: #4f3b22;
  font-size: 0.84rem;
  line-height: 1.35;
}

.hero-warning a {
  color: inherit;
  font-weight: 650;
}

.demo-block {
  margin-top: 18px;
}

.laptop-shell {
  z-index: 1;
  position: relative;
  max-width: 642px;
  margin: 0 auto;
  background: #0d131d;
  border-radius: 16px 16px 0 0;
  border: 2px solid #131a25;
  box-shadow: var(--shadow-lg);
  padding: 10px 10px 0;
  overflow: hidden;
}

.laptop-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 110px;
  height: 13px;
  background: #090d14;
  border-radius: 0 0 11px 11px;
}

.demo-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: 9px 9px 0 0;
  overflow: hidden;
  background: #cad7e8;
}

.demo-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.demo-ball {
  position: absolute;
  right: 54px;
  top: 38px;
  z-index: 3;
  width: clamp(88px, 15.5vw, 126px);
  aspect-ratio: 1 / 1;
  border-radius: 9999px;
  background: rgba(124, 182, 255, 0.52);
  box-shadow: inset 0 0 0 1px rgba(124, 182, 255, 0.35);
  transform: scale(0.8);
  transform-origin: center;
  /* keep in sync with src/main.rs BREATH_HTML .ball animation */
  animation: demo-breathe 5.5s cubic-bezier(0.42, 0, 0.58, 1) infinite alternate;
  cursor: -webkit-grab;
  cursor: grab;
  pointer-events: auto;
  touch-action: none;
}

.demo-ball.is-dragging {
  cursor: -webkit-grabbing;
  cursor: grabbing;
}

.demo-ball-note {
  position: absolute;
  right: -35px;
  top: 30px;
  z-index: 5;
  margin: 0;
  width: 164px;
  text-align: center;
  padding: 5px 0;
  font-size: 0.64rem;
  font-weight: 620;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #f8fcff;
  background: linear-gradient(180deg, #86addf 0%, #7098cf 100%);
  border: 1px solid rgba(206, 224, 245, 0.8);
  box-shadow: 0 5px 12px rgba(23, 41, 63, 0.22);
  transform: rotate(45deg);
  transform-origin: center;
  pointer-events: none;
  user-select: none;
}

.feature-strip {
  position: relative;
  z-index: 2;
  margin: -25px auto 0;
  max-width: 720px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.best-use-line {
  margin: 12px auto 0;
  max-width: 720px;
  text-align: center;
  color: var(--muted);
  font-size: 0.84rem;
}

.mini-card {
  background: var(--soft-card);
  border: 1px solid var(--line);
  border-radius: 11px;
  box-shadow: var(--shadow-md);
  padding: 12px 13px;
}

.mini-icon {
  margin: 0;
  color: #7c8798;
  font-size: 1.04rem;
}

.mini-card h3 {
  margin: 5px 0 5px;
  font-size: 1rem;
  letter-spacing: -0.012em;
}

.mini-card p {
  margin: 0;
  color: #445262;
  line-height: 1.35;
  font-size: 0.84rem;
}

.notice-card,
.download-card,
.faq-card,
.updates-card {
  margin: 14px auto 0;
  max-width: 510px;
  border-radius: 12px;
}

.notice-card {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  box-shadow: var(--shadow-md);
  padding: 14px 16px;
}

.notice-card h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.notice-card p,
.notice-card li {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.38;
}

.notice-card ol {
  margin: 8px 0 0;
  padding-left: 18px;
}

.download-card {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  padding: 12px;
}

.download-meta {
  margin: 0;
  color: #485361;
  font-size: 0.84rem;
  line-height: 1.35;
}

#download-help {
  margin-top: 4px;
}

#release-version {
  text-align: center;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  margin-top: 11px;
  justify-content: center;
}

.download-main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#platform-note {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.78rem;
}

.checksum-link {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.faq-card {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow-md);
}

details {
  border-top: 1px solid var(--line);
}

details:first-child {
  border-top: 0;
}

summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 14px;
  font-size: 0.93rem;
  font-weight: 530;
}

summary::-webkit-details-marker {
  display: none;
}

details p {
  margin: 0;
  padding: 0 14px 12px;
  color: #4a5665;
  font-size: 0.86rem;
  line-height: 1.4;
}

.updates-card {
  text-align: center;
}

.updates-title {
  margin: 0 0 8px;
  color: #3f4d5d;
  font-size: 0.87rem;
}

.updates-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.updates-row input {
  border: 1px solid var(--line);
  background: #f9fcff;
  border-radius: 8px;
  padding: 9px 11px;
  font: inherit;
  font-size: 0.87rem;
  flex: 1 1 auto;
  min-width: 0;
}

.updates-row .button {
  flex: 0 0 auto;
}

.site-footer {
  margin-top: 16px;
  text-align: center;
}

.footer-actions {
  display: inline-flex;
  gap: 8px;
}

.footer-pill {
  color: #313d4d;
  text-decoration: none;
  border: 1px solid var(--line);
  background: #f7faff;
  border-radius: 8px;
  font-size: 0.8rem;
  padding: 6px 10px;
}

.privacy-note {
  margin: 11px auto 3px;
  max-width: 540px;
  color: var(--muted);
  font-size: 0.78rem;
}

#contact-line {
  color: var(--muted);
  font-size: 0.8rem;
}

.is-hidden {
  display: none !important;
}

.is-disabled {
  opacity: 0.58;
  pointer-events: none;
}

@keyframes demo-breathe {
  from {
    transform: scale(0.8);
  }

  to {
    transform: scale(1);
  }
}

@media (max-width: 780px) {
  .top-nav {
    justify-content: center;
  }

  .feature-strip {
    grid-template-columns: 1fr;
    margin-top: 10px;
  }

  .laptop-shell {
    border-radius: 13px;
  }

  .demo-stage {
    border-radius: 7px;
  }

  .notice-card,
  .download-card,
  .faq-card,
  .updates-card {
    max-width: 100%;
  }
}