/* Inkforge landing — cyberpunk dark, brand-aligned (Brand Guideline §6) */

:root {
  --void-black: #05030E;
  --deep-indigo: #0F0A1E;
  --night-violet: #1A1430;
  --dusk-plum: #2D1F4D;
  --electric-cyan: #00F0FF;
  --hot-magenta: #FF2E97;
  --plasma-purple: #B14BFF;
  --hazard-gold: #FFD600;
  --glitch-green: #00FF94;
  --hologram-white: #F5F7FF;
  --drift-blue: #A8B5D9;
  --phantom-gray: #5A6789;

  --font-mono: ui-monospace, "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", system-ui, "Hiragino Sans", "Noto Sans JP", "PingFang TC", "Microsoft JhengHei", sans-serif;

  --max-width: 1080px;
  --gap: 1.5rem;
  --radius: 4px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--void-black);
  color: var(--hologram-white);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-image:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(0, 240, 255, 0.06), transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 30%, rgba(255, 46, 151, 0.05), transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(177, 75, 255, 0.05), transparent 60%);
  min-height: 100vh;
}

/* ---------- i18n visibility ---------- */
[data-lang="zh"] .t-en, [data-lang="zh"] .t-ja { display: none; }
[data-lang="en"] .t-zh, [data-lang="en"] .t-ja { display: none; }
[data-lang="ja"] .t-zh, [data-lang="ja"] .t-en { display: none; }

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid rgba(45, 31, 77, 0.5);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--hologram-white);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.brand-mark {
  color: var(--electric-cyan);
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
  font-size: 1.1rem;
}

.brand-text {
  font-weight: 500;
}

.lang-switch {
  display: flex;
  gap: 0.25rem;
  border: 1px solid var(--dusk-plum);
  border-radius: var(--radius);
  padding: 2px;
  background: rgba(15, 10, 30, 0.6);
}

.lang-switch button {
  background: transparent;
  color: var(--drift-blue);
  border: none;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  border-radius: 2px;
  transition: color 120ms, background 120ms;
}

.lang-switch button:hover {
  color: var(--hologram-white);
}

.lang-switch button[aria-pressed="true"] {
  background: rgba(0, 240, 255, 0.12);
  color: var(--electric-cyan);
}

/* ---------- Main layout ---------- */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--phantom-gray);
  margin: 0 0 2.5rem;
  text-transform: uppercase;
}

/* ---------- Hero ---------- */
.hero {
  padding: 6rem 0 5rem;
  text-align: left;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--electric-cyan);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  margin: 0 0 1.5rem;
  text-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 5.5vw, 4rem);
  font-weight: 500;
  line-height: 1.15;
  margin: 0 0 1.75rem;
  letter-spacing: -0.01em;
}

.hero-title .comma {
  color: var(--hot-magenta);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--drift-blue);
  max-width: 36em;
  margin: 0 0 2.5rem;
}

.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform 100ms, box-shadow 150ms, background 150ms, color 150ms;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--electric-cyan);
  color: var(--void-black);
  box-shadow: 0 0 0 1px var(--electric-cyan), 0 0 20px rgba(0, 240, 255, 0.35);
}

.btn-primary:hover {
  background: var(--hologram-white);
  box-shadow: 0 0 0 1px var(--hologram-white), 0 0 28px rgba(0, 240, 255, 0.6);
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--hologram-white);
  background: transparent;
  border: 1px solid var(--dusk-plum);
}

.btn-ghost:hover {
  border-color: var(--electric-cyan);
  color: var(--electric-cyan);
}

.btn-lg {
  font-size: 1.05rem;
  padding: 1rem 2rem;
  margin-top: 2rem;
}

.btn-meta {
  font-size: 0.75rem;
  opacity: 0.7;
  font-weight: 400;
  letter-spacing: 0;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--phantom-gray);
  letter-spacing: 0.06em;
  margin: 0;
}

/* ---------- Features ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.feature {
  background: var(--deep-indigo);
  border: 1px solid var(--dusk-plum);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  transition: border-color 150ms, transform 150ms;
}

.feature:hover {
  border-color: var(--electric-cyan);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.5rem;
  color: var(--electric-cyan);
  margin-bottom: 0.75rem;
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
  font-family: var(--font-mono);
}

.feature h3 {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
  color: var(--hologram-white);
}

.feature p {
  margin: 0;
  color: var(--drift-blue);
  font-size: 0.92rem;
}

.feature code {
  font-family: var(--font-mono);
  background: var(--night-violet);
  color: var(--electric-cyan);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 0.85em;
}

/* ---------- Screenshots ---------- */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.screenshot-frame {
  margin: 0;
  background: var(--deep-indigo);
  border: 1px solid var(--dusk-plum);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 150ms, transform 150ms, box-shadow 150ms;
}

.screenshot-frame:hover {
  border-color: var(--electric-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 240, 255, 0.12);
}

.screenshot-frame img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--void-black);
}

.screenshot-frame figcaption {
  font-family: var(--font-mono);
  color: var(--drift-blue);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--dusk-plum);
  text-align: center;
}

/* ---------- Download ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1rem;
}

.download-card {
  background: var(--deep-indigo);
  border: 1px solid var(--dusk-plum);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
}

.download-card h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  margin: 0 0 1rem;
  color: var(--electric-cyan);
}

.download-card p,
.download-card ul {
  margin: 0;
  color: var(--drift-blue);
  font-size: 0.92rem;
}

.download-card ul {
  padding-left: 1.2rem;
}

.download-card li {
  margin-bottom: 0.4rem;
}

.key {
  display: block;
  margin-top: 1rem;
  padding: 0.6rem 0.75rem;
  background: var(--void-black);
  border: 1px solid var(--dusk-plum);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--glitch-green);
  word-break: break-all;
  user-select: all;
}

.download {
  text-align: center;
}

.download .section-title {
  text-align: left;
}

.download-grid + .btn-lg {
  display: inline-flex;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--dusk-plum);
  padding: 3rem 2rem 2rem;
  max-width: var(--max-width);
  margin: 4rem auto 0;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: 1rem;
  margin: 0 0 0.4rem;
  color: var(--hologram-white);
}

.footer-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--phantom-gray);
  margin: 0;
}

.footer h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--phantom-gray);
  margin: 0 0 0.75rem;
  font-weight: 500;
}

.footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer li {
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
}

.footer a {
  color: var(--drift-blue);
  text-decoration: none;
  transition: color 120ms;
}

.footer a:hover {
  color: var(--electric-cyan);
}

.footer-bottom {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--phantom-gray);
  margin: 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(45, 31, 77, 0.5);
  letter-spacing: 0.04em;
}

.footer-bottom .sep {
  margin: 0 0.5rem;
  color: var(--dusk-plum);
}

/* ---------- Inline links ---------- */
a {
  color: var(--plasma-purple);
}
a:hover {
  color: var(--electric-cyan);
}

/* ---------- Selection ---------- */
::selection {
  background: var(--electric-cyan);
  color: var(--void-black);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .topbar { padding: 1rem 1.25rem; }
  main { padding: 0 1.25rem; }
  section { padding: 3.5rem 0; }
  .hero { padding: 4rem 0 3rem; }
  .footer { padding: 2.5rem 1.25rem 1.5rem; }
  .footer-cols { grid-template-columns: 1fr; gap: 1.5rem; }
  .cta-row { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .btn-primary:hover { transform: none; }
  .feature:hover { transform: none; }
}