:root {
  --bg: #0d1117;
  --bg-card: #151b23;
  --bg-card-2: #1b232d;
  --border: #2a3542;
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #76b900;
  --accent-dim: #5c9200;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site-header {
  background: #0a0e13;
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.brand span { color: var(--accent); }

nav.main-nav { display: flex; gap: 22px; }
nav.main-nav a {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.95rem;
}
nav.main-nav a:hover, nav.main-nav a.active { color: var(--accent); text-decoration: none; }

main { max-width: 1100px; margin: 0 auto; padding: 40px 24px 80px; }

h1 { font-size: 2rem; margin-bottom: 6px; }
h2 { font-size: 1.4rem; margin-top: 40px; }
.subtitle { color: var(--text-dim); margin-top: 0; margin-bottom: 32px; }

.hero {
  background: linear-gradient(135deg, #131a22, #0d1117);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 48px 40px;
  margin-bottom: 40px;
}
.hero h1 { font-size: 2.3rem; }
.hero p { color: var(--text-dim); max-width: 620px; }
.hero .cta { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #0a0e13;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
}
.btn:hover { background: var(--accent-dim); text-decoration: none; }
.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
}
.card h3 { margin-top: 0; margin-bottom: 2px; font-size: 1.15rem; }
.card .tagline { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 16px; }

.spec-row { margin-bottom: 14px; }
.spec-row .value { font-weight: 700; font-size: 1.1rem; color: var(--accent); }
.spec-row .label { color: var(--text-dim); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
.spec-row .note { font-size: 0.87rem; color: var(--text-dim); margin-top: 2px; }

.power-box {
  background: var(--bg-card-2);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 10px;
}
.power-box strong { color: var(--text); }

table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-dim); font-weight: 600; text-transform: uppercase; font-size: 0.75rem; letter-spacing: 0.04em; }
tr:hover td { background: var(--bg-card); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 0.78rem; font-weight: 600; }
.badge.yes { background: rgba(118,185,0,0.15); color: var(--accent); }
.badge.no { background: rgba(255,107,107,0.12); color: var(--danger); }

.math-box {
  background: var(--bg-card-2);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88rem;
  margin: 10px 0 18px;
  color: var(--text);
}

.path-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 26px;
}
.path-card ol { padding-left: 20px; color: var(--text-dim); }
.path-card li { margin-bottom: 8px; }

.recommend-box {
  margin-top: 20px;
  background: linear-gradient(135deg, rgba(118,185,0,0.12), rgba(118,185,0,0.03));
  border: 1px solid var(--accent-dim);
  border-radius: 10px;
  padding: 18px;
}
.recommend-box .price { font-size: 1.6rem; font-weight: 800; color: var(--accent); }

.note-box {
  background: var(--bg-card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 18px 0;
  font-size: 0.93rem;
  color: var(--text-dim);
}
.note-box.warn { border-color: #6b5a1e; background: rgba(255,196,0,0.05); }
.note-box strong { color: var(--text); }

form.quote-form { max-width: 480px; }
form.quote-form label { display: block; margin-bottom: 6px; font-size: 0.85rem; color: var(--text-dim); }
form.quote-form input, form.quote-form select {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 18px;
  background: var(--bg-card-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}
form.quote-form input:focus, form.quote-form select:focus { outline: none; border-color: var(--accent); }

.error-msg { color: var(--danger); margin-bottom: 16px; font-size: 0.9rem; }

.confirm-box {
  text-align: center;
  padding: 50px 20px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dim);
  border-radius: 14px;
}
.confirm-box .req-number { font-size: 2.2rem; font-weight: 800; color: var(--accent); letter-spacing: 0.03em; margin: 14px 0; }

footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 30px;
  border-top: 1px solid var(--border);
}