/* ============================================================
   NovaShell — product site
   ============================================================ */

:root {
  --bg: #070a0f;
  --bg-1: #0a0f16;
  --bg-2: #0d141d;
  --line: rgba(122, 190, 255, 0.10);
  --line-strong: rgba(122, 190, 255, 0.18);
  --text: #dbe8f6;
  --dim: #93a6bd;
  --mute: #60748c;
  --cyan: #2be7ff;
  --mint: #35ffb0;
  --warn: #ffc861;
  --font: "Segoe UI Variable Text", "Segoe UI", "Microsoft YaHei UI", system-ui, sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.7 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

i, em { font-style: normal; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.04);
  color: #b9d9ea;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

svg.i {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------------------------------------------------------- background */

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(122, 190, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 190, 255, 0.035) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
}

.bg-orb {
  position: fixed;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(90px);
  opacity: 0.5;
}
.orb-a {
  width: 620px;
  height: 620px;
  top: -220px;
  right: -140px;
  background: radial-gradient(circle, rgba(43, 231, 255, 0.22), transparent 68%);
  animation: float-a 18s ease-in-out infinite;
}
.orb-b {
  width: 520px;
  height: 520px;
  top: 46%;
  left: -200px;
  background: radial-gradient(circle, rgba(53, 255, 176, 0.16), transparent 68%);
  animation: float-b 22s ease-in-out infinite;
}

@keyframes float-a {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(-40px, 40px, 0); }
}
@keyframes float-b {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(50px, -30px, 0); }
}

/* ---------------------------------------------------------- nav */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
  padding: 0 28px;
  border-bottom: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s, backdrop-filter 0.25s;
}
.nav.scrolled {
  background: rgba(7, 10, 15, 0.78);
  border-bottom-color: var(--line);
  backdrop-filter: blur(14px);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: 0.02em;
  font-size: 15px;
}
.nav-brand img { border-radius: 8px; }

.nav-links {
  display: flex;
  gap: 22px;
  margin-left: 10px;
  font-size: 13.5px;
  color: var(--dim);
}
.nav-links a { position: relative; padding: 6px 0; transition: color 0.16s; }
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), var(--mint));
  transition: width 0.2s;
}
.nav-links a:hover::after { width: 100%; }

.nav-right { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.chip {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 11px/1.4 var(--mono);
  color: var(--mute);
}

.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--dim);
  border-radius: 2px;
}

/* ---------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 10px;
  font: 500 13.5px/1 var(--font);
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn svg.i { width: 16px; height: 16px; }

.btn-primary {
  color: #04121a;
  font-weight: 650;
  background: linear-gradient(135deg, var(--cyan), var(--mint));
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 8px 26px rgba(43, 231, 255, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 10px 34px rgba(43, 231, 255, 0.34), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--dim);
  border-color: var(--line);
  background: rgba(122, 190, 255, 0.05);
}
.btn-ghost:hover { color: var(--text); border-color: var(--line-strong); background: rgba(122, 190, 255, 0.1); }

.btn-sm { height: 32px; padding: 0 13px; font-size: 12.5px; border-radius: 8px; }
.btn-lg { height: 48px; padding: 0 24px; font-size: 15px; border-radius: 12px; }

/* ---------------------------------------------------------- hero */

.hero {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 150px 28px 90px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font: 600 11px/1.4 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  opacity: 0.9;
}

.hero h1 {
  margin: 16px 0 20px;
  font-size: clamp(40px, 5.4vw, 68px);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.hero h1 em {
  background: linear-gradient(100deg, var(--cyan), var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  max-width: 540px;
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--dim);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 22px; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.hero-meta li {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 11px/1.4 var(--mono);
  color: var(--mute);
}

.hero-visual { position: relative; }

.window {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: #05080c;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.02) inset;
  overflow: hidden;
}
.window-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(12, 18, 26, 0.9);
}
.window-bar .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}
.window-bar .dot:first-child { background: rgba(255, 95, 122, 0.6); }
.window-title {
  margin-left: 8px;
  font: 10.5px/1 var(--mono);
  color: var(--mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.window img { display: block; width: 100%; height: auto; }

.glow {
  position: absolute;
  inset: -10% -14%;
  z-index: -1;
  background: radial-gradient(circle at 60% 40%, rgba(43, 231, 255, 0.22), transparent 62%);
  filter: blur(40px);
  pointer-events: none;
}

/* ---------------------------------------------------------- sections */

.section {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 84px 28px;
}

.section-head { text-align: center; max-width: 660px; margin: 0 auto 44px; }
.section-head h2 {
  margin: 14px 0 12px;
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 650;
  letter-spacing: -0.01em;
}
.section-head p { margin: 0; font-size: 14.5px; color: var(--mute); line-height: 1.85; }

.grid { display: grid; gap: 16px; }

/* features */
.features { grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }

.card {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.028), rgba(255, 255, 255, 0.008));
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(360px 140px at 20% 0%, rgba(43, 231, 255, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(43, 231, 255, 0.28);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 22px;
  height: 22px;
  margin-bottom: 14px;
  color: var(--cyan);
  filter: drop-shadow(0 0 10px rgba(43, 231, 255, 0.35));
}
.card h3 { margin: 0 0 8px; font-size: 15.5px; font-weight: 600; }
.card p { margin: 0; font-size: 13px; line-height: 1.85; color: var(--mute); }

/* shots */
.shots { grid-template-columns: repeat(2, 1fr); }
.shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #05080c;
  cursor: zoom-in;
  transition: border-color 0.2s, transform 0.2s;
}
.shot:hover { border-color: rgba(43, 231, 255, 0.3); transform: translateY(-2px); }
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--dim);
}

/* manual */
.manual-grid { grid-template-columns: repeat(3, 1fr); }
.panel {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
}
.panel-num {
  font: 700 40px/1 var(--mono);
  background: linear-gradient(120deg, var(--cyan), var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.panel h3 { margin: 10px 0 8px; font-size: 15px; }
.panel p { margin: 0; font-size: 12.5px; line-height: 1.85; color: var(--mute); }

.manual-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  padding: 14px 18px;
  border: 1px solid rgba(43, 231, 255, 0.16);
  border-radius: 12px;
  background: rgba(43, 231, 255, 0.05);
}
.manual-note svg.i { color: var(--cyan); }
.manual-note p { margin: 0; font-size: 13px; color: var(--dim); }

/* download */
.download-section { padding-top: 60px; }

.download-panel {
  border: 1px solid rgba(43, 231, 255, 0.18);
  border-radius: 18px;
  background:
    radial-gradient(900px 260px at 20% -10%, rgba(43, 231, 255, 0.12), transparent 65%),
    linear-gradient(180deg, #0c131c, #080d14);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.download-main {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px 28px 24px;
  border-bottom: 1px solid var(--line);
}
.download-icon img {
  border-radius: 16px;
  box-shadow: 0 0 30px rgba(43, 231, 255, 0.25);
}
.download-info { flex: 1; min-width: 0; }
.download-info h3 { margin: 0 0 4px; font-size: 18px; }
.download-meta { margin: 0 0 10px; font: 11.5px/1.6 var(--mono); color: var(--mute); }

.checksum {
  display: flex;
  align-items: center;
  gap: 8px;
  font: 10.5px/1.5 var(--mono);
  color: var(--mute);
}
.checksum code {
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
  color: #9fb6c9;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: min(100%, 560px);
}
.copy-btn {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--mute);
  cursor: pointer;
}
.copy-btn:hover { color: var(--cyan); border-color: rgba(43, 231, 255, 0.35); }
.copy-btn svg.i { width: 12px; height: 12px; }

.download-btn { flex: 0 0 auto; }

.download-sub {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  padding: 20px 28px 24px;
}
.download-sub h4 { margin: 0 0 10px; font-size: 12px; color: var(--dim); letter-spacing: 0.06em; }
.ticks { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 7px; }
.ticks li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--mute);
}
.ticks svg.i { width: 14px; height: 14px; color: var(--mint); }

.download-alt {
  display: flex;
  align-items: center;
  gap: 8px;
  align-self: flex-end;
  font-size: 12px;
  color: var(--mute);
}
.download-alt a { color: var(--dim); border-bottom: 1px solid var(--line-strong); padding-bottom: 1px; }
.download-alt a:hover { color: var(--cyan); border-color: rgba(43, 231, 255, 0.5); }

/* steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li {
  position: relative;
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
}
.step-num {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 14px;
  border: 1px solid rgba(43, 231, 255, 0.3);
  border-radius: 9px;
  background: rgba(43, 231, 255, 0.1);
  color: var(--cyan);
  font: 600 13px/1 var(--mono);
}
.steps h3 { margin: 0 0 7px; font-size: 15px; }
.steps p { margin: 0; font-size: 12.5px; line-height: 1.85; color: var(--mute); }

/* faq */
.faq { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.018);
  transition: border-color 0.2s, background 0.2s;
}
.faq details[open] { border-color: rgba(43, 231, 255, 0.22); background: rgba(43, 231, 255, 0.03); }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font: 400 18px/1 var(--mono);
  color: var(--mute);
  transition: transform 0.2s, color 0.2s;
}
.faq details[open] summary::after { transform: rotate(45deg); color: var(--cyan); }
.faq details p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--dim);
}

/* ---------------------------------------------------------- footer */

.footer {
  position: relative;
  z-index: 1;
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: rgba(5, 8, 12, 0.6);
}
.footer-main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 28px 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand img { border-radius: 8px; }
.footer-brand strong { font-size: 14px; }
.footer-brand p { margin: 2px 0 0; font-size: 12px; color: var(--mute); }

.footer-links { display: flex; gap: 20px; font-size: 13px; color: var(--mute); }
.footer-links a:hover { color: var(--text); }

.footer-bottom {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 28px 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--mute);
}

/* ---------------------------------------------------------- lightbox / toast */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  padding: 32px;
  background: rgba(3, 5, 9, 0.86);
  backdrop-filter: blur(8px);
  animation: fade 0.18s ease;
}
.lightbox[hidden] { display: none; }
.lightbox figure { margin: 0; max-width: 1400px; width: 100%; }
.lightbox img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 82vh;
  object-fit: contain;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.7);
}
.lightbox figcaption {
  margin-top: 14px;
  text-align: center;
  font-size: 12.5px;
  color: var(--dim);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(12, 19, 28, 0.9);
  color: var(--dim);
  font-size: 15px;
  cursor: pointer;
}
.lightbox-close:hover { color: var(--text); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  z-index: 95;
  transform: translateX(-50%);
  padding: 10px 18px;
  border: 1px solid rgba(43, 231, 255, 0.3);
  border-radius: 10px;
  background: rgba(10, 16, 23, 0.96);
  color: var(--text);
  font-size: 12.5px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
  animation: rise 0.2s ease;
}
.toast[hidden] { display: none; }

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes rise { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---------------------------------------------------------- reveal */

.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in { opacity: 1; transform: none; transition: opacity 0.5s ease, transform 0.5s ease; }

/* ---------------------------------------------------------- responsive */

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 124px; }
  .shots { grid-template-columns: 1fr; }
  .manual-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav { gap: 12px; padding: 0 16px; }
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(7, 10, 15, 0.97);
    backdrop-filter: blur(14px);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 4px; font-size: 14px; border-bottom: 1px solid var(--line); }
  .nav-toggle { display: block; }
  .nav-right .chip { display: none; }

  .hero { padding: 108px 18px 60px; }
  .section { padding: 60px 18px; }
  .download-main { flex-wrap: wrap; }
  .download-btn { width: 100%; }
  .checksum code { max-width: 100%; }
  .footer-main { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bg-orb, .reveal { animation: none !important; }
  .reveal { opacity: 1; transform: none; }
}