/* ─────────────────────────────────────────────
   XDeck — landing page
   Aesthetic: editorial / crafted-minimal
   Display: Fraunces (serif, soft optical)
   Mono:    JetBrains Mono (technical accents)
   Theme:   dark by default, light via prefers
   ───────────────────────────────────────────── */

@import url("https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,500;0,9..144,700;0,9..144,900;1,9..144,400;1,9..144,700&family=JetBrains+Mono:wght@400;500;700&display=swap");

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:        #0a0a0a;
  --bg-soft:   #111111;
  --ink:       #f5f3ee;
  --ink-soft:  #a3a09a;
  --ink-faint: #44423d;
  --line:      #1f1d1a;
  --accent:    #f5f3ee;        /* high-contrast pill on dark */
  --accent-ink:#0a0a0a;
  --rule:      rgba(245,243,238,0.08);
  --grid:      rgba(245,243,238,0.035);

  --serif: "Fraunces", "Hiragino Mincho ProN", "Yu Mincho", "ヒラギノ明朝 ProN", serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans:  -apple-system, "Helvetica Neue", "Hiragino Sans", system-ui, sans-serif;

  --max-w: 1240px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #f5f3ee;
    --bg-soft:   #eceae3;
    --ink:       #0a0a0a;
    --ink-soft:  #5a5852;
    --ink-faint: #c8c5bd;
    --line:      #e0ddd4;
    --accent:    #0a0a0a;
    --accent-ink:#f5f3ee;
    --rule:      rgba(10,10,10,0.10);
    --grid:      rgba(10,10,10,0.04);
  }
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* ── Background: vertical column grid (TweetDeck metaphor) ── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px);
  background-size: calc(100vw / 6) 100%;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 40%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 40%, #000 40%, transparent 100%);
}

/* ── Background: soft glow ── */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 900px 500px at 50% 0%, rgba(29,155,240,0.10), transparent 70%),
    radial-gradient(ellipse 700px 400px at 80% 90%, rgba(245,243,238,0.04), transparent 70%);
}

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

/* ──────────── Header ──────────── */
.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px clamp(20px, 4vw, 56px);
  border-bottom: 1px solid var(--rule);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.005em;
}
.site-logo img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  box-shadow: 0 0 0 1px var(--rule);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}
@media (max-width: 640px) {
  .header-meta { display: none; }
}

/* Language switcher */
.lang-switch {
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--rule);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch a {
  padding: 7px 14px;
  color: var(--ink-soft);
  transition: background 0.2s, color 0.2s;
}
.lang-switch a + a { border-left: 1px solid var(--rule); }
.lang-switch a.active {
  background: var(--ink);
  color: var(--bg);
}
.lang-switch a:hover:not(.active) { color: var(--ink); }

/* ──────────── Hero ──────────── */
.hero {
  position: relative;
  z-index: 1;
  padding: clamp(32px, 5vh, 64px) clamp(20px, 4vw, 56px) clamp(40px, 6vh, 64px);
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}

/* Eyebrow row */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 40px;
}
.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #1d9bf0;
  box-shadow: 0 0 0 4px rgba(29,155,240,0.18);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(29,155,240,0.18); }
  50%      { box-shadow: 0 0 0 7px rgba(29,155,240,0.05); }
}

/* Headline */
.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.6rem, 7.2vw, 6.4rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--ink);
  font-variation-settings: "opsz" 144;
  margin-bottom: 36px;
  text-wrap: balance;
}
.hero h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
}
.hero h1 .x-mark {
  font-style: normal;
  font-weight: 700;
  display: inline-block;
  transform: translateY(-0.04em);
}

/* Description */
.hero .lead {
  font-family: var(--sans);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 48px;
  text-wrap: pretty;
}
.hero .lead strong {
  color: var(--ink);
  font-weight: 600;
}

/* CTA */
.cta-wrap {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.hero-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  color: var(--accent-ink);
  background: var(--accent);
  line-height: 1;
}
.hero-cta .arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s cubic-bezier(.2,.8,.2,1);
}
.hero-cta .arrow svg { width: 16px; height: 16px; display: block; }
.hero-cta:hover .arrow { transform: translateX(3px); }

.hero-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
  transition: box-shadow 0.6s cubic-bezier(.2,.8,.2,1);
  pointer-events: none;
}
.hero-cta:hover::after {
  box-shadow:
    0 0 0 1.5px rgba(255, 255, 255, 0.85),
    0 0 28px 2px rgba(255, 255, 255, 0.35),
    0 22px 60px -10px rgba(255, 255, 255, 0.35);
}
@media (prefers-color-scheme: light) {
  .hero-cta:hover::after {
    box-shadow:
      0 0 0 1.5px rgba(10, 10, 10, 0.85),
      0 0 28px 2px rgba(10, 10, 10, 0.18),
      0 22px 60px -10px rgba(10, 10, 10, 0.25);
  }
}

.cta-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}
.cta-meta span + span::before {
  content: "·";
  margin: 0 8px;
  color: var(--ink-faint);
}

/* ──────────── Screenshot showcase ──────────── */
.showcase {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: var(--max-w);
  padding: 0 clamp(20px, 4vw, 56px) clamp(80px, 12vh, 140px);
}

.showcase-frame {
  position: relative;
}
.showcase-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  border-radius: 6px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.85);
}
.showcase-scroll img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}
@media (max-width: 720px) {
  .showcase-scroll img {
    width: auto;
    height: 70vh;
    max-height: 560px;
  }
}

/* ──────────── Configuration section ──────────── */
.config {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 56px) clamp(80px, 12vh, 140px);
}

.config-inner {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
@media (max-width: 820px) {
  .config-inner { grid-template-columns: 1fr; }
}

.config-eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.config-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--ink-faint);
}

.config h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.9rem, 3.6vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
  text-wrap: balance;
}
.config h2 em {
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
}

.config p {
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.7;
  max-width: 38ch;
}
.config p + p { margin-top: 14px; }
.config kbd {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 2px 7px;
  border-radius: 5px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  color: var(--ink);
}

.config-code {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.45);
}
.config-code .code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.config-code .code-head .dots {
  display: inline-flex;
  gap: 5px;
}
.config-code .code-head .dots span {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--ink-faint);
}
.config-code pre {
  margin: 0;
  padding: 22px 24px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink);
}
.config-code .tok-key   { color: #7dd3fc; }
.config-code .tok-str   { color: #fbbf24; }
.config-code .tok-num   { color: #c4b5fd; }
.config-code .tok-pun   { color: var(--ink-soft); }
.config-code .tok-com   { color: var(--ink-faint); font-style: italic; }
@media (prefers-color-scheme: light) {
  .config-code .tok-key { color: #0369a1; }
  .config-code .tok-str { color: #b45309; }
  .config-code .tok-num { color: #6d28d9; }
}

/* ──────────── Footer ──────────── */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--rule);
  padding: 32px clamp(20px, 4vw, 56px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}
.site-footer a:hover { color: var(--ink); }
.site-footer .footer-links { display: flex; gap: 22px; }

/* ──────────── Animations ──────────── */
@keyframes rise {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.rise { opacity: 0; animation: rise 0.95s cubic-bezier(.2,.8,.2,1) forwards; }
.rise-1 { animation-delay: 0.05s; }
.rise-2 { animation-delay: 0.18s; }
.rise-3 { animation-delay: 0.32s; }
.rise-4 { animation-delay: 0.46s; }
.rise-5 { animation-delay: 0.62s; }

.showcase-frame {
  opacity: 0;
  transform: translateY(40px);
  animation: rise 1.2s 0.7s cubic-bezier(.2,.8,.2,1) forwards;
}

@media (prefers-reduced-motion: reduce) {
  .rise, .showcase-frame { animation: none; opacity: 1; transform: none; }
  .eyebrow .dot { animation: none; }
}