:root {
  --bg: #0b1020;
  --bg-elev: #111827;
  --bg-card: #111827;
  --bg-card-hover: #151c2c;
  --border: #1f2937;
  --border-strong: #374151;
  --text: #f3f4f6;
  --text-muted: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --green: #34d399;
  --amber: #fbbf24;
  --radius: 8px;
  --max: 1080px;
  --font: Inter, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
.container { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }

/* Header — quiet, sticky, flat */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 16, 32, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 650;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo:hover { text-decoration: none; color: var(--text); }
.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 700;
}
.nav-links {
  display: flex;
  gap: 0.15rem 1.25rem;
  flex-wrap: wrap;
  align-items: center;
}
.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0.2rem 0;
  font-weight: 500;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  text-decoration: none;
}

/* Buttons — flat, no gradient glow */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.05rem;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Hero — generous whitespace, no text gradient */
.hero {
  padding: 4rem 0 2.5rem;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
}
.hero h1 {
  font-size: clamp(1.85rem, 4.5vw, 2.6rem);
  line-height: 1.2;
  margin: 0 0 0.85rem;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--text);
}
.hero h1 span {
  color: var(--accent);
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
}
.hero-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 34rem;
  margin: 0 auto 1.75rem;
  line-height: 1.7;
}
.search-box {
  display: flex;
  gap: 0.5rem;
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.45rem 0.4rem 0.95rem;
}
.search-box:focus-within { border-color: var(--border-strong); }
.search-box input {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  font-family: inherit;
  min-width: 0;
}
.search-box input::placeholder { color: var(--text-muted); }

/* Sections */
.section { padding: 2.5rem 0; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.section-head h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.section-head p,
.muted {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.9rem;
}

/* Sponsor — quiet, bottom placement */
.sponsor-slot {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  padding: 1.15rem 1.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.sponsor-slot .label {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  font-weight: 500;
}
.sponsor-slot strong { font-size: 0.98rem; font-weight: 600; }
.sponsor-slot .btn { font-weight: 500; }

/* Cards — flat borders, subtle hover */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
  transition: border-color 0.12s ease, background 0.12s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
  text-decoration: none;
}
.card-icon {
  font-size: 1.35rem;
  margin-bottom: 0.55rem;
  line-height: 1;
  opacity: 0.9;
}
.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.55;
}
.tool-card .tool-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}
.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  white-space: nowrap;
}
.badge-free { background: rgba(52, 211, 153, 0.12); color: var(--green); }
.badge-freemium { background: var(--accent-soft); color: var(--accent-hover); }
.badge-paid { background: rgba(251, 191, 36, 0.12); color: var(--amber); }
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.75rem;
}
.tag {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

/* Pricing (sponsor page) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
}
.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
}
.price-card.featured {
  border-color: var(--accent);
}
.price-card .price {
  font-size: 1.85rem;
  font-weight: 700;
  margin: 0.5rem 0;
  letter-spacing: -0.02em;
}
.price-card .price small {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}
.price-card ul {
  margin: 1rem 0 1.25rem;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.price-card li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
}
.price-card li:last-child { border-bottom: 0; }
.ribbon {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
}

/* Forms */
.form-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}
.form-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}
.success-msg {
  display: none;
  text-align: center;
  padding: 1.5rem;
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.25);
  border-radius: var(--radius);
  color: var(--green);
}
.success-msg.show { display: block; }

/* Inner pages */
.page-hero { padding: 2.5rem 0 1.25rem; }
.page-hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3.5vw, 1.9rem);
  letter-spacing: -0.02em;
  font-weight: 700;
}
.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.tool-detail {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  max-width: 720px;
}
.tool-detail h1 { margin: 0 0 0.5rem; letter-spacing: -0.02em; }
.tool-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

/* Footer */
.site-footer {
  margin-top: 2.5rem;
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-links {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--text); text-decoration: none; }

.hidden { display: none !important; }
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

@media (max-width: 600px) {
  .hero { padding: 2.5rem 0 1.75rem; }
  .container { width: min(100% - 1.5rem, var(--max)); }
  .nav-links { width: 100%; gap: 0.15rem 1rem; }
  .sponsor-slot { flex-direction: column; align-items: flex-start; }
  .section { padding: 1.75rem 0; }
}