:root {
  --bg: #0f1115;
  --bg-soft: #171a21;
  --panel: #1d212b;
  --panel-2: #232834;
  --line: #2c3340;
  --text: #e8ecf3;
  --muted: #9aa6b8;
  --accent: #5b8cff;
  --accent-2: #36d399;
  --warn: #f7b955;
  --danger: #ff6b6b;
  --radius: 14px;
  --maxw: 1180px;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(91, 140, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(54, 211, 153, 0.10), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px clamp(16px, 4vw, 40px);
  background: rgba(15, 17, 21, 0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; flex-direction: column; }
.logo { font-size: 20px; font-weight: 800; letter-spacing: 0.5px; }
.logo b { color: var(--accent); }
.tagline { font-size: 12px; color: var(--muted); }
.topnav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.topnav a { color: var(--muted); }
.topnav a:hover { color: var(--text); }
.badge {
  font-size: 12px; color: var(--accent-2);
  border: 1px solid rgba(54, 211, 153, 0.4);
  padding: 4px 10px; border-radius: 999px;
  background: rgba(54, 211, 153, 0.08);
}

main { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(16px, 4vw, 40px); }

.hero { padding: clamp(40px, 7vw, 80px) 0 28px; }
.hero h1 { font-size: clamp(28px, 4.4vw, 46px); line-height: 1.18; margin: 0 0 16px; font-weight: 800; }
.hero .hl {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { font-size: clamp(15px, 1.7vw, 18px); color: var(--muted); max-width: 760px; margin: 0 0 26px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600; padding: 12px 22px;
  border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: #0b1020; }
.btn.primary:hover { background: #6f9bff; }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); }

.workspace {
  display: grid; grid-template-columns: 1fr 1fr; gap: 22px;
  padding: 10px 0 50px; align-items: start;
}
.panel {
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; gap: 14px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel-head h2 { font-size: 16px; margin: 0; }
.panel-actions { display: flex; gap: 8px; }
.mini {
  background: var(--panel-2); color: var(--muted); border: 1px solid var(--line);
  font-size: 12px; padding: 6px 12px; border-radius: 8px; cursor: pointer;
}
.mini:hover { color: var(--text); border-color: var(--accent); }
.hint { font-size: 13px; color: var(--muted); margin: 0; }
.hint code, .output code { background: var(--panel-2); padding: 1px 6px; border-radius: 5px; font-size: 12px; }

textarea {
  width: 100%; min-height: 280px; resize: vertical;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 14px;
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 14px; line-height: 1.7;
}
textarea:focus, input:focus, .output:focus { outline: 2px solid rgba(91, 140, 255, 0.5); outline-offset: 1px; }

.meta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: 5px; flex: 1; min-width: 150px; }
.field span { font-size: 12px; color: var(--muted); }
.field input {
  background: var(--bg); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 12px; font-size: 14px;
}

.stat-strip { display: flex; gap: 10px; flex-wrap: wrap; }
.stat {
  display: flex; flex-direction: column; gap: 2px;
  background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 9px; padding: 8px 12px; min-width: 76px;
}
.stat b { font-size: 18px; }
.stat span { font-size: 11px; color: var(--muted); }
.stat.done b { color: var(--accent-2); }
.stat.doing b { color: var(--accent); }
.stat.blocked b { color: var(--danger); }
.stat.plan b { color: var(--warn); }

.tabs { display: flex; gap: 6px; background: var(--bg); padding: 4px; border-radius: 10px; border: 1px solid var(--line); }
.tab {
  background: transparent; color: var(--muted); border: none; cursor: pointer;
  font-size: 13px; padding: 7px 13px; border-radius: 7px; font-weight: 600;
}
.tab.active { background: var(--accent); color: #0b1020; }
.view-desc { font-size: 13px; color: var(--muted); margin: 0; min-height: 20px; }

.output {
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px; min-height: 320px; max-height: 560px; overflow: auto;
  white-space: pre-wrap; word-break: break-word;
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 13.5px; line-height: 1.75; margin: 0;
}
.output .empty { color: var(--muted); }

.output-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.copy-hint { font-size: 13px; color: var(--accent-2); }

.how { padding: 20px 0 70px; }
.how h2 { font-size: 22px; margin: 0 0 20px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px;
}
.card h3 { font-size: 15px; margin: 0 0 8px; color: var(--accent); }
.card p { font-size: 13.5px; color: var(--muted); margin: 0; }

.footer {
  border-top: 1px solid var(--line); padding: 22px clamp(16px, 4vw, 40px);
  color: var(--muted); font-size: 13px; text-align: center;
}

@media (max-width: 900px) {
  .workspace { grid-template-columns: 1fr; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .topnav a { display: none; }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
  .tagline { display: none; }
}