:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --border: #2e3d52;
  --text: #e8eef6;
  --muted: #8b9bb0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

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

body {
  font-family: var(--font);
  background: linear-gradient(160deg, #0b1220 0%, #121a28 50%, #0f1419 100%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #60a5fa; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Nav */
.nav {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.04em;
}
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.nav-links a, .nav-links span {
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
}
.nav-links a:hover { background: var(--surface2); color: var(--text); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: 0.15s ease;
  background: var(--surface2);
  color: var(--text);
}
.btn:hover { filter: brightness(1.08); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost { background: transparent; color: var(--muted); }
.btn-lg { padding: 14px 28px; font-size: 1.05rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Hero */
.hero {
  padding: 72px 0 48px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.hero .tagline {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  padding: 24px 0 64px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 { margin-bottom: 8px; font-size: 1.1rem; }
.card p { color: var(--muted); font-size: 0.95rem; }

/* Forms */
.form-wrap {
  max-width: 420px;
  margin: 48px auto;
}
.form-wrap h1 { margin-bottom: 8px; text-align: center; }
.form-wrap .sub { text-align: center; color: var(--muted); margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.9rem;
}
.form-group input, .form-group select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}
.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}
.alert {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}
.alert-error { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border: 1px solid rgba(239,68,68,0.3); }
.alert-ok { background: rgba(34, 197, 94, 0.12); color: #86efac; border: 1px solid rgba(34,197,94,0.3); }
.alert-info { background: rgba(59, 130, 246, 0.12); color: #93c5fd; border: 1px solid rgba(59,130,246,0.3); }

/* Pricing */
.page-head { padding: 48px 0 24px; text-align: center; }
.page-head h1 { margin-bottom: 8px; }
.page-head p { color: var(--muted); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  padding: 16px 0 48px;
}
.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.price-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow);
}
.price-card .badge {
  align-self: flex-start;
  font-size: 0.75rem;
  background: rgba(59,130,246,0.2);
  color: #93c5fd;
  padding: 2px 8px;
  border-radius: 999px;
}
.price-card h3 { font-size: 1.2rem; }
.price-card .price {
  font-size: 2rem;
  font-weight: 700;
}
.price-card .price small { font-size: 0.95rem; font-weight: 500; color: var(--muted); }
.price-card .note { color: var(--muted); font-size: 0.9rem; flex: 1; }
.section-label {
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 8px 0 4px;
}

/* Me / table */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 24px 0;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.stat .label { color: var(--muted); font-size: 0.85rem; }
.stat .value { font-size: 1.8rem; font-weight: 700; margin-top: 4px; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
th, td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}
th { color: var(--muted); font-weight: 600; background: var(--surface2); }
tr:last-child td { border-bottom: none; }
.badge-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.8rem;
  background: var(--surface2);
  color: var(--muted);
}
.badge-status.queued { color: #fcd34d; background: rgba(245,158,11,0.15); }
.badge-status.done { color: #86efac; background: rgba(34,197,94,0.15); }
.badge-status.error { color: #fca5a5; background: rgba(239,68,68,0.15); }

/* Tool */
.tool-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 24px 0 48px;
}
@media (max-width: 800px) {
  .tool-layout { grid-template-columns: 1fr; }
}
#viewer {
  width: 100%;
  height: 360px;
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
#viewer .placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  pointer-events: none;
}
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: 0.15s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: rgba(59,130,246,0.06);
}
.dropzone input { display: none; }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: 40px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.muted { color: var(--muted); }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.text-center { text-align: center; }

.footer a {
  color: var(--muted);
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}