:root {
  --bg: #0b1f4b;
  --ink: #f4f7fc;
  --muted: #b0c4e0;
  --line: #e80e16;
  --court: #73b5ff;
  --wash: #17326e;
  --cork: #c9a66b;
  --spine-w: 11rem;
  font-family: "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

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

body {
  margin: 0;
  min-height: 100vh;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--line);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 99;
}

.skip-link:focus {
  left: 0;
}

.page-shell {
  display: flex;
  min-height: 100vh;
}

.nav-spine {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--spine-w);
  padding: 1.5rem 1rem;
  background: linear-gradient(180deg, #081836 0%, #0b1f4b 60%, #102a5c 100%);
  border-right: 1px solid rgba(115, 181, 255, 0.25);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  z-index: 10;
}

.spine-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.spine-mark {
  width: 10px;
  height: 42px;
  background: var(--line);
  border-radius: 2px;
}

.spine-name {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.spine-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.9rem;
}

.spine-links a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.15rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
}

.spine-links a:hover,
.spine-links a:focus-visible {
  color: var(--ink);
  border-left-color: var(--line);
}

.spine-foot {
  margin-top: auto;
  font-size: 0.75rem;
  color: var(--muted);
}

.main-column {
  margin-left: var(--spine-w);
  flex: 1;
  max-width: 72rem;
  padding: 2rem clamp(1.25rem, 4vw, 3rem) 3rem;
}

.hero {
  display: grid;
  gap: 2rem;
  align-items: center;
  margin-bottom: 4rem;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: 1fr 1.15fr;
  }
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--court);
  margin: 0 0 0.5rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 0.75rem;
  line-height: 1.05;
}

.tagline {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 36ch;
}

.hero-window {
  margin: 0;
  background: var(--wash);
  border: 1px solid rgba(115, 181, 255, 0.35);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.window-chrome {
  display: flex;
  gap: 6px;
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.25);
}

.window-chrome span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(244, 247, 252, 0.35);
}

.hero-window img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.section-intro {
  max-width: 40rem;
  margin-bottom: 1.75rem;
}

.section-intro.align-right {
  margin-left: auto;
  text-align: right;
}

.section-intro h2 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
}

.section-intro p {
  margin: 0;
  color: var(--muted);
}

.features {
  margin-bottom: 4rem;
}

.cork-board {
  background: linear-gradient(145deg, #5c3d1e 0%, #8b5e2f 40%, #6b4525 100%);
  border-radius: 18px;
  padding: 2rem clamp(1rem, 3vw, 2.5rem);
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.35);
}

.cork-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .cork-notes {
    grid-template-columns: repeat(3, 1fr);
  }
}

.note {
  background: #f7f0d8;
  color: #1a2233;
  padding: 1.25rem 1.1rem 1.4rem;
  border-radius: 4px;
  box-shadow: 2px 4px 12px rgba(0, 0, 0, 0.35);
  position: relative;
}

.note::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 50%;
  width: 14px;
  height: 14px;
  background: radial-gradient(circle at 30% 30%, #ddd, #888);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.note-tilt-left {
  transform: rotate(-1.5deg);
}

.note-tilt-right {
  transform: rotate(1.2deg);
}

.note h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.note p {
  margin: 0;
  font-size: 0.92rem;
}

.screens {
  margin-bottom: 4rem;
}

.device-pair-wrap {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .device-pair-wrap {
    grid-template-columns: 1fr 1fr;
  }
}

.device-frame {
  margin: 0;
  padding: 0.75rem;
  background: #0a1633;
  border-radius: 28px;
  border: 2px solid rgba(115, 181, 255, 0.4);
}

.device-frame img {
  display: block;
  width: 100%;
  border-radius: 18px;
}

.about {
  margin-bottom: 4rem;
}

.about-band {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

@media (min-width: 800px) {
  .about-band {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

.about-band img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(115, 181, 255, 0.3);
}

.about-prose p {
  color: var(--muted);
}

.legal {
  background: rgba(8, 24, 54, 0.85);
  border: 1px solid rgba(115, 181, 255, 0.2);
  border-radius: 16px;
  padding: 1.5rem clamp(1rem, 3vw, 2rem);
  margin-bottom: 2rem;
}

.tab-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab-bar button {
  flex: 1;
  border: 1px solid rgba(115, 181, 255, 0.35);
  background: transparent;
  color: var(--muted);
  padding: 0.65rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
}

.tab-bar button[aria-selected="true"] {
  background: var(--line);
  color: #fff;
  border-color: var(--line);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.tab-panel h3 {
  margin-top: 0;
}

.tab-panel p {
  color: var(--muted);
}

.site-footer {
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid rgba(115, 181, 255, 0.2);
  padding-top: 1.5rem;
}

@media (max-width: 720px) {
  .nav-spine {
    position: static;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid rgba(115, 181, 255, 0.25);
  }

  .spine-links {
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
  }

  .spine-foot {
    width: 100%;
    margin-top: 0;
  }

  .page-shell {
    flex-direction: column;
  }

  .main-column {
    margin-left: 0;
  }

  .section-intro.align-right {
    text-align: left;
    margin-left: 0;
  }
}