:root {
  --primary: #3b3b3b;
  --accent: #c2410c;
  --accent-light: #fff7ed;
  --text: #292524;
  --text-secondary: #78716c;
  --bg: #fafaf9;
  --card-bg: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

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

/* ---- 瀵艰埅鏍?---- */
nav {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}

.logo span {
  color: var(--accent);
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
  padding: 4px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* ---- 椤甸潰涓讳綋 ---- */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---- 棣栭〉澶фí骞?---- */
.hero {
  text-align: center;
  padding: 100px 0 80px;
  position: relative;
}

.hero-badge {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
  letter-spacing: -1px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- 鎸夐挳 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-sm);
  font-size: 0.93rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(194,65,12,0.2);
}

.btn-primary:hover {
  background: #9a3412;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(194,65,12,0.3);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

/* ---- 鐗规€у崱鐗囧尯 ---- */
.features {
  padding: 40px 0 80px;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-heading {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-sub {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 500px;
  margin-bottom: 40px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s, transform 0.25s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  background: var(--accent-light);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.card .btn-sm { display: inline-block; }

/* ---- 鐭ヨ瘑鍗＄墖缃戞牸 ---- */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.knowledge-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s;
}

.knowledge-card:hover {
  box-shadow: var(--shadow);
}

.knowledge-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.knowledge-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ---- 椤甸潰鏍囬 ---- */
.page-title {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 60px;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.page-desc {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 0.95rem;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 40px 0 16px;
}

/* ---- 琛ㄥ崟 ---- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 11px 16px;
  background: var(--card-bg);
  border: 1.5px solid #e7e5e4;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.93rem;
  font-family: var(--font);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(194,65,12,0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ---- 琛ㄦ牸 ---- */
.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  font-size: 0.9rem;
}

th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid #e7e5e4;
}

td {
  border-bottom: 1px solid #f5f5f4;
  color: var(--text);
}

/* ---- 缁撴灉鍖?---- */
.result-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 28px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
}

.result-box h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.result-highlight {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}

/* ---- 宸ヨ壓娴佺▼ ---- */
.process-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 28px 0;
}

.process-step {
  flex: 1;
  min-width: 200px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s;
}

.process-step:hover { box-shadow: var(--shadow); }

.process-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 14px;
}

.process-step h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.process-step p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ---- FAQ ---- */
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius);
  margin-bottom: 10px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-q {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
}

.faq-q:hover { background: #fafaf9; }

.faq-q::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 400;
}

.faq-q.open::after { content: '\2212'; }

.faq-a {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.faq-a.open {
  padding: 0 24px 20px;
  max-height: 600px;
}

/* ---- 椤佃剼 ---- */
footer {
  text-align: center;
  padding: 32px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 80px;
}

/* ---- 杈呭姪 ---- */
.add-btn {
  background: transparent;
  color: var(--accent);
  border: 1.5px dashed var(--accent);
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 20px;
  transition: all 0.2s;
}

.add-btn:hover {
  background: var(--accent-light);
}

.dye-row, .aux-row {
  display: grid;
  grid-template-columns: 2fr 1fr auto;
  gap: 12px;
  margin-bottom: 14px;
  align-items: end;
}

.remove-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 4px;
}

.remove-btn:hover { color: var(--accent); }

.badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-green { background: #f0fdf4; color: #15803d; }
.badge-orange { background: #fff7ed; color: #c2410c; }
.badge-blue { background: #eff6ff; color: #1d4ed8; }

.param-table td:first-child {
  font-weight: 600;
  color: var(--text-secondary);
  width: 180px;
}

/* ---- 鍝嶅簲寮?---- */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero { padding: 60px 0 50px; }
  .form-row { grid-template-columns: 1fr; }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 0.8rem; }
  .cards { grid-template-columns: 1fr; }
  .knowledge-grid { grid-template-columns: 1fr; }
  nav { padding: 0 16px; }
  main { padding: 0 16px; }
  .section-heading { font-size: 1.5rem; }
}