:root {
  --bg: #0a0a0d;
  --bg-elevated: rgba(255, 255, 255, 0.04);
  --bg-elevated-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --text: #f2f2f5;
  --text-dim: #9a9aa5;
  --text-dimmer: #6b6b76;
  --accent: #7c8cff;
  --accent-soft: rgba(124, 140, 255, 0.15);
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --radius: 12px;
  --bg-image: url("backgrounds/midnight.png");
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

body[data-theme="aurora"] { --accent: #34d399; --accent-soft: rgba(52, 211, 153, 0.15); --bg-image: url("backgrounds/aurora.png"); }
body[data-theme="sunset"] { --accent: #f97066; --accent-soft: rgba(249, 112, 102, 0.15); --bg-image: url("backgrounds/sunset.png"); }
body[data-theme="mono"]   { --accent: #b4b4c0; --accent-soft: rgba(180, 180, 192, 0.15); --bg-image: url("backgrounds/mono.png"); }

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.bg-fixed {
  position: fixed;
  inset: 0;
  background-image: var(--bg-image);
  background-size: cover;
  background-position: center top;
  z-index: -1;
  opacity: 0.9;
  transition: background-image 400ms ease;
}

.bg-fixed::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,13,0.35) 0%, rgba(10,10,13,0.55) 40%, var(--bg) 92%);
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---- nav ---- */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; letter-spacing: -0.01em; }
.logo .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.badge {
  font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 20px;
  background: var(--accent-soft); color: var(--accent); letter-spacing: 0.02em;
}
.nav-right { display: flex; align-items: center; gap: 16px; }

.theme-picker { display: flex; gap: 8px; align-items: center; padding: 4px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 20px; }
.theme-swatch {
  width: 20px; height: 20px; border-radius: 50%; cursor: pointer; border: 2px solid transparent;
  transition: transform 150ms ease, border-color 150ms ease;
}
.theme-swatch:hover { transform: scale(1.12); }
.theme-swatch.active { border-color: #fff; }
.theme-swatch[data-theme="midnight"] { background: linear-gradient(135deg, #4d64ff, #9d5cff); }
.theme-swatch[data-theme="aurora"] { background: linear-gradient(135deg, #28e6a0, #4788e0); }
.theme-swatch[data-theme="sunset"] { background: linear-gradient(135deg, #ff8248, #eb3c82); }
.theme-swatch[data-theme="mono"] { background: linear-gradient(135deg, #87879a, #cfcfd8); }

/* ---- hero ---- */
.hero { padding: 72px 0 40px; text-align: center; }
.hero h1 {
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 20px;
}
.hero h1 .accent { color: var(--accent); }
.hero p.sub {
  font-size: 18px; color: var(--text-dim); max-width: 620px; margin: 0 auto 32px;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 9px; font-weight: 600; font-size: 14.5px;
  text-decoration: none; border: 1px solid var(--border); transition: all 150ms ease;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #0a0a0d; border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn-ghost { background: var(--bg-elevated); color: var(--text); }
.btn-ghost:hover { background: var(--bg-elevated-hover); }
.hero .note { font-size: 13px; color: var(--text-dimmer); }

/* ---- mockup ---- */
.mockup-shell {
  margin: 56px auto 0;
  max-width: 880px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(18, 18, 24, 0.82);
  backdrop-filter: blur(20px);
  box-shadow: 0 40px 100px -30px rgba(0,0,0,0.6);
  overflow: hidden;
  text-align: left;
}
.mockup-titlebar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  font-size: 12px; color: var(--text-dimmer);
}
.mockup-titlebar .traffic { display: flex; gap: 6px; margin-right: 6px; }
.mockup-titlebar .traffic span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.15); }
.mockup-body { display: grid; grid-template-columns: 260px 1fr; min-height: 340px; }
.mockup-sidebar { border-right: 1px solid var(--border); padding: 10px 8px; font-size: 13px; }
.mockup-section { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px; color: var(--text-dimmer); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.06em; margin-top: 8px; }
.mockup-count { background: rgba(255,255,255,0.08); border-radius: 10px; padding: 0 6px; font-size: 10px; }
.mockup-row { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 6px; cursor: default; }
.mockup-row:hover { background: var(--bg-elevated); }
.mockup-row .dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.mockup-row .label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mockup-row .meta { color: var(--text-dimmer); font-size: 11px; }
.dot.working { background: var(--green); box-shadow: 0 0 6px var(--green); animation: pulse 1.4s ease-in-out infinite; }
.dot.waiting { background: var(--yellow); }
.dot.idle { background: var(--text-dimmer); }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }
.mockup-main { padding: 18px 22px; font-size: 13px; color: var(--text-dim); }
.mockup-main h4 { color: var(--text); font-size: 15px; margin-bottom: 4px; }
.mockup-terminal {
  margin-top: 14px; background: #050506; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 14px; font-family: var(--mono); font-size: 12px; color: #8fe3a3; line-height: 1.7;
}
.mockup-terminal .prompt { color: var(--text-dimmer); }

/* ---- sections ---- */
section { padding: 88px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 48px; }
.section-head .eyebrow { color: var(--accent); font-weight: 700; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px; display: block; }
.section-head h2 { font-size: clamp(26px, 4vw, 36px); letter-spacing: -0.02em; margin-bottom: 12px; }
.section-head p { color: var(--text-dim); font-size: 16px; }

.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.problem-grid p { color: var(--text-dim); font-size: 16px; margin-bottom: 14px; }
.problem-card {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; font-family: var(--mono); font-size: 12.5px; color: var(--text-dim); line-height: 1.9;
}
.problem-card .l1 { color: var(--red); }
.problem-card .l2 { color: var(--yellow); }
.problem-card .l3 { color: var(--text-dimmer); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.feature-card:hover { transform: translateY(-2px); border-color: var(--accent); background: var(--bg-elevated-hover); }
.feature-card .icon {
  width: 36px; height: 36px; border-radius: 9px; display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent); font-size: 17px; margin-bottom: 14px;
}
.feature-card h3 { font-size: 15.5px; margin-bottom: 6px; letter-spacing: -0.01em; }
.feature-card p { font-size: 13.5px; color: var(--text-dim); }

/* ---- patch log ---- */
.patch-log { max-width: 760px; margin: 0 auto; }
.patch-entry {
  display: grid; grid-template-columns: 84px 1fr; gap: 20px;
  padding: 20px 0; border-bottom: 1px solid var(--border);
}
.patch-entry:last-child { border-bottom: none; }
.patch-ver { font-family: var(--mono); font-size: 12px; color: var(--text-dimmer); padding-top: 2px; }
.patch-title { font-size: 15px; font-weight: 600; margin-bottom: 5px; letter-spacing: -0.01em; }
.patch-desc { font-size: 13.5px; color: var(--text-dim); }
.patch-tag {
  display: inline-block; font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  padding: 2px 7px; border-radius: 5px; margin-right: 8px; vertical-align: middle;
}
.patch-tag.fix { background: rgba(248, 81, 73, 0.15); color: #ff8079; }
.patch-tag.feat { background: var(--accent-soft); color: var(--accent); }

footer {
  padding: 48px 0 64px; text-align: center; color: var(--text-dimmer); font-size: 13px;
  border-top: 1px solid var(--border);
}
footer a { color: var(--text-dim); text-decoration: none; }
footer a:hover { color: var(--text); }

@media (max-width: 760px) {
  .problem-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .mockup-body { grid-template-columns: 1fr; }
  .mockup-sidebar { display: none; }
  .patch-entry { grid-template-columns: 1fr; gap: 4px; }
}