/* ====================================================
   燃品 Design — Master Stylesheet (v3.0)
   ==================================================== */

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #f4f7fb;
  --text: #122033;
  --muted: #4a5568;
  --primary: #155dfc;
  --primary-2: #4f46e5;
  --border: #e6ebf3;
  --shadow: 0 16px 40px rgba(17, 32, 51, 0.08);
  --accent: #f3f7ff;
  --radius: 22px;
  --radius-sm: 14px;
  --radius-xs: 10px;
  --transition: 0.2s ease;
}

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

body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: radial-gradient(circle at 10% 0%, rgba(21, 93, 252, 0.04) 0%, transparent 30%),
                    radial-gradient(circle at 90% 100%, rgba(79, 70, 229, 0.04) 0%, transparent 30%);
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--primary);
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 0 0 8px 8px;
  z-index: 9999;
  font-weight: 600;
  font-size: 0.88rem;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; color: #fff; }

.container { width: min(1160px, calc(100% - 2rem)); margin: 0 auto; }

.hero { padding: 1rem 0 4.8rem; background: linear-gradient(135deg, #eaf2ff 0%, #f8fbff 100%); }
.subpage-hero { padding-bottom: 3rem; }

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 0 1.8rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text);
}
.brand:hover { color: var(--text); }

.brand-text {
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 1.2rem;
  color: var(--muted);
}

.nav-links a {
  font-weight: 500;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--muted); font-weight: 500; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span[aria-current] { color: var(--text); font-weight: 600; }
.breadcrumb-light { color: rgba(255,255,255,0.7); }
.breadcrumb-light a { color: rgba(255,255,255,0.7); }
.breadcrumb-light a:hover { color: #fff; }
.breadcrumb-light span[aria-current] { color: #fff; }
.breadcrumb-light span:not([aria-current]) { color: rgba(255,255,255,0.4); }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

h1, h2, h3 { margin-top: 0; }

h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

h3 { font-size: 1.12rem; line-height: 1.4; margin-bottom: 0.4rem; }

.lead, .section-text { color: var(--muted); max-width: 680px; }
.section-text { margin-top: 0.3rem; }
.page-intro { padding-top: 1rem; }

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.4rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.88rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
}
.btn:hover { transform: translateY(-2px); color: #fff; }

.btn-primary {
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 10px 24px rgba(21, 93, 252, 0.18);
}
.btn-primary:hover { box-shadow: 0 14px 30px rgba(21, 93, 252, 0.25); }

.btn-secondary {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
}
.btn-secondary:hover {
  color: var(--text);
  border-color: var(--primary);
  box-shadow: 0 6px 16px rgba(21, 93, 252, 0.08);
}
.hero-content {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: start;
  padding-top: 2rem;
}

.hero-stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.8rem;
}

.hero-stats div {
  min-width: 118px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.76);
}

.hero-stats strong { display: block; font-size: 1.15rem; color: var(--text); }
.hero-stats span { color: var(--muted); font-size: 0.9rem; }

.hero-panel,
.card,
.trust-box,
.contact-box,
.step,
.case-card,
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover, .case-card:hover {
  box-shadow: 0 20px 48px rgba(17, 32, 51, 0.12);
  transform: translateY(-3px);
}

.hero-panel {
  padding: 1.5rem;
  background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
}
.hero-panel h3 { margin-bottom: 0.7rem; }

.hero-panel ul, .card ul, .trust-box ul {
  padding-left: 0;
  list-style: none;
  color: var(--muted);
}

.hero-panel ul li, .card ul li, .trust-box ul li, .content-card ul li {
  padding: 0.3rem 0;
  line-height: 1.7;
}

.panel-link {
  display: inline-block;
  margin-top: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  transition: color var(--transition);
}
.panel-link:hover { color: var(--primary-2); }
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
}

.card-highlight { border-color: var(--primary); border-width: 2px; }

.card-link {
  display: inline-block;
  margin-top: 0.6rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
  transition: color var(--transition);
}
.card-link:hover { color: var(--primary-2); }

.section { padding: 5rem 0; }
.section-alt { background: #f8fbff; }
.section-heading { margin-bottom: 2rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.card, .case-card { padding: 1.5rem; }
.card p, .case-card p { color: var(--muted); }

.trust-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.trust-box { padding: 1.5rem; }

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.case-card:hover { border-color: var(--primary); }

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}
.content-card { padding: 1.5rem; }
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.benefit-card {
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  transition: box-shadow var(--transition);
}
.benefit-card:hover { box-shadow: 0 8px 20px rgba(17, 32, 51, 0.06); }

.cta-banner {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: linear-gradient(90deg, #f7faff 0%, #eef4ff 100%);
  border: 1px solid var(--border);
  text-align: center;
}
.cta-banner p { color: var(--muted); margin: 0.4rem 0 0.8rem; }

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.step { padding: 1.4rem; }

.step span {
  display: inline-block;
  font-weight: 700;
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.process-inline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.process-inline-item {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--accent);
}

.process-inline-item strong { color: var(--primary); display: block; margin-bottom: 0.4rem; }
.process-inline-item p { color: var(--muted); font-size: 0.92rem; margin: 0; }
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item[open] { border-color: var(--primary); }

.faq-item summary {
  padding: 1rem 1.4rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition);
}
.faq-item summary:hover { background: var(--accent); }

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform var(--transition);
}

.faq-item[open] summary::after { content: "-"; }
.faq-item summary::-webkit-details-marker { display: none; }

.faq-answer {
  padding: 0 1.4rem 1.2rem;
  color: var(--muted);
  line-height: 1.8;
}
.faq-answer p { margin: 0; }
.faq-answer strong { color: var(--text); }

.contact-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding: 1.8rem;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 1.5rem;
}

.contact-info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.8rem;
}
.contact-info-card h2 { margin-bottom: 1.2rem; }
.contact-method {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.contact-method:last-child { border-bottom: none; }

.contact-method-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.contact-method h3 { margin-bottom: 0.2rem; }
.contact-method p { color: var(--muted); margin: 0; font-size: 0.95rem; }
.contact-method a { color: var(--primary); font-weight: 600; }

.contact-form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.8rem;
}
.contact-form-card h2 { margin-bottom: 0.4rem; }
.contact-form-card > p { color: var(--muted); margin-bottom: 1rem; }

.contact-info-list { list-style: none; padding: 0; margin: 0; }
.contact-info-list li { padding: 0.4rem 0; font-size: 0.95rem; }
.contact-info-list a { color: var(--primary); }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-weight: 600; font-size: 0.92rem; margin-bottom: 0.3rem; color: var(--text); }
.required { color: #e53e3e; font-weight: 400; }
.contact-form { display: flex; flex-direction: column; }
input, textarea, select, button { font: inherit; }
input, textarea, select {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(21, 93, 252, 0.12);
}
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235f6f82' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

button[type="submit"] {
  border: none;
  cursor: pointer;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  color: white;
  padding: 0.9rem 1.2rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition);
  margin-top: 0.5rem;
}
button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(21, 93, 252, 0.2);
}

.case-filter {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.case-filter a {
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--muted);
  transition: all var(--transition);
}
.case-filter a:hover, .case-filter-active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.case-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.8rem;
  margin-bottom: 1.5rem;
}

.case-detail-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}
.case-detail-header h2 { margin-bottom: 0; }

.case-tag {
  display: inline-block;
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.82rem;
  white-space: nowrap;
}
.case-detail-content {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 1.5rem;
  align-items: start;
}

.case-detail-main h3 { color: var(--text); margin-top: 1rem; margin-bottom: 0.4rem; }
.case-detail-main h3:first-child { margin-top: 0; }
.case-detail-main p { color: var(--muted); }
.case-detail-main ul { padding-left: 1.2rem; color: var(--muted); margin: 0.5rem 0; }
.case-detail-main ul li { padding: 0.2rem 0; }

.case-detail-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.case-sidebar-card {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--accent);
}
.case-sidebar-card h4 { font-size: 0.88rem; margin-bottom: 0.5rem; color: var(--text); }
.case-sidebar-card dl { margin: 0; }
.case-sidebar-card dt { font-weight: 600; font-size: 0.82rem; color: var(--muted); margin-top: 0.4rem; }
.case-sidebar-card dd { margin: 0.1rem 0 0; font-size: 0.92rem; }

.case-result {
  border-color: var(--primary);
  background: linear-gradient(135deg, #f0f4ff 0%, #fafcff 100%);
}

.case-images { margin-top: 1.2rem; }

.case-img-placeholder {
  width: 100%;
  min-height: 200px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--muted);
  background: var(--surface-2);
}
.case-img-placeholder span { font-weight: 600; font-size: 0.95rem; }
.case-img-placeholder p { font-size: 0.85rem; margin: 0; }
.footer {
  padding: 1.5rem 0 2.2rem;
  color: var(--muted);
  background: #f9fbff;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.2rem;
  padding-top: 1rem;
}


.footer-brand {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 0.3rem;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer p { margin: 0.1rem 0; font-size: 0.9rem; }

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-links a { color: var(--muted); font-weight: 500; font-size: 0.9rem; }
.footer-links a:hover { color: var(--primary); }

/* =========== 响应式 =========== */
@media (max-width: 860px) {
  .hero-content, .trust-layout, .contact-box, .contact-layout,
  .process-steps, .process-inline, .card-grid, .case-grid,
  .content-grid, .benefits-grid { grid-template-columns: 1fr; }
  .case-detail-content { grid-template-columns: 1fr; }
  .nav { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .nav-links { flex-wrap: wrap; gap: 0.6rem; }
  /* 删除下面这行，不再改成纵向 */
 .footer-content { flex-direction: column; gap: 0.5rem; } 
 .footer-brand { flex-direction: column; gap: 0.5rem;}
}

@media (max-width: 600px) {
  h1 { font-size: clamp(1.5rem, 6vw, 2.2rem); }
  .section { padding: 3rem 0; }
  .hero-stats div { min-width: 100px; }
  .case-filter { gap: 0.4rem; }
  .case-filter a { padding: 0.4rem 0.8rem; font-size: 0.82rem; }
}

/* =========== 动态案例卡片网格 =========== */
.case-filter-btn {
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--muted);
  background: #fff;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.case-filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.case-filter-btn.case-filter-active {
  background: var(--primary) !important;
  color: #fff !important;
  border-color: var(--primary) !important;
}

.cases-loading { text-align: center; padding: 3rem 0; }
.cases-loading p { color: var(--muted); margin-top: 1rem; }

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

.no-cases { text-align: center; color: var(--muted); padding: 3rem 0; font-size: 1rem; }

.cases-grid-dynamic {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.case-card-dynamic {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.case-card-dynamic:hover {
  transform: translateY(-5px);
  box-shadow: 0 24px 56px rgba(17, 32, 51, 0.14);
  border-color: var(--primary);
}

.case-card-image {
  position: relative;
  width: 100%;
  padding-top: 65%;
  overflow: hidden;
  background: var(--surface-2);
}
.case-card-image img {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.case-card-dynamic:hover .case-card-image img { transform: scale(1.05); }

.case-card-placeholder {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent) 0%, var(--surface-2) 100%);
}
.case-card-placeholder span { color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.case-card-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(to bottom, transparent 40%, rgba(21, 93, 252, 0.85) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 1rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.case-card-dynamic:hover .case-card-overlay { opacity: 1; }

.view-detail {
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 999px;
  transition: background var(--transition);
}
.view-detail:hover { background: rgba(255,255,255,0.15); color: #fff; }

.case-card-content { padding: 1.2rem; }

.case-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.case-tag-small {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
}

.case-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  line-height: 1.4;
  color: var(--text);
}

.case-card-summary {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-card-results {
  display: flex;
  gap: 1rem;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
}

.case-result-item { display: flex; flex-direction: column; }
.case-result-item .result-value { font-weight: 700; font-size: 0.92rem; color: var(--primary); }
.case-result-item .result-label { font-size: 0.75rem; color: var(--muted); }
/* =========== 案例详情视图 =========== */
.case-detail-view { animation: fadeIn 0.3s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.case-detail-container { margin-top: 1rem; }

.case-detail-full {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.case-detail-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.case-detail-image {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}
.case-detail-image img { width: 100%; height: auto; display: block; transition: transform 0.3s ease; }
.case-detail-image:hover img { transform: scale(1.03); }

.case-img-placeholder-large {
  width: 100%;
  min-height: 250px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--muted);
  background: var(--surface-2);
  text-align: center;
  padding: 2rem;
}

.case-detail-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.case-meta-card {
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--accent);
}
.case-meta-card h4 {
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 0.6rem;
}
.case-meta-card dl { margin: 0; }
.case-meta-card dt { font-weight: 600; font-size: 0.8rem; color: var(--muted); margin-top: 0.4rem; }
.case-meta-card dt:first-child { margin-top: 0; }
.case-meta-card dd { margin: 0.1rem 0 0; font-size: 0.92rem; }
.case-results-card { border-color: var(--primary); background: linear-gradient(135deg, #f0f4ff 0%, #fafcff 100%); }
.case-detail-section {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.case-detail-section:last-child { border-bottom: none; }
.case-detail-section h2 { font-size: 1.2rem; color: var(--text); margin-bottom: 0.6rem; }
.case-detail-section p { color: var(--muted); line-height: 1.8; }
.case-detail-section ul { padding-left: 1.2rem; color: var(--muted); margin: 0.5rem 0; }
.case-detail-section ul li { padding: 0.2rem 0; line-height: 1.7; }

.case-client-feedback blockquote {
  margin: 0;
  padding: 1.2rem 1.5rem;
  border-left: 4px solid var(--primary);
  background: var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}
.case-client-feedback blockquote p { color: var(--text); font-size: 1.05rem; line-height: 1.8; }

.case-detail-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.tags-label { font-size: 0.88rem; color: var(--muted); font-weight: 500; }

/* =========== 管理后台样式 =========== */
.admin-body { min-height: 100vh; display: flex; flex-direction: column; }
.admin-screen { flex: 1; }

#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #eaf2ff 0%, #f8fbff 100%);
}

.admin-login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem;
  text-align: center;
  max-width: 400px;
  width: 100%;
}
.admin-login-box h1 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.admin-login-box > p { color: var(--muted); margin-bottom: 1.5rem; font-size: 0.92rem; }
.admin-login-box .form-group { text-align: left; margin-bottom: 1.2rem; }

.form-hint { font-size: 0.82rem; color: var(--muted); margin-top: 0.3rem; }
.admin-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  margin-bottom: 2rem;
}
.admin-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.admin-header h1 { font-size: 1.3rem; margin-bottom: 0; }
.admin-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.admin-actions .btn { padding: 0.6rem 1rem; font-size: 0.88rem; }

.admin-section { margin-bottom: 2rem; }
.admin-section h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.admin-cases-list { display: flex; flex-direction: column; gap: 1rem; }

.admin-case-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.admin-case-item:hover { border-color: var(--primary); }

.admin-case-thumb {
  width: 100px;
  height: 70px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--surface-2);
}
.admin-case-thumb img { width: 100%; height: 100%; object-fit: cover; }

.admin-case-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.8rem;
}

.admin-case-info { flex: 1; min-width: 0; }
.admin-case-info h3 { font-size: 1rem; margin-bottom: 0.2rem; color: var(--text); }
.admin-case-info p { font-size: 0.85rem; color: var(--muted); margin: 0.1rem 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.admin-case-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }
.admin-case-actions .btn { padding: 0.5rem 0.9rem; font-size: 0.82rem; border-radius: 8px; }
.btn-danger {
  background: #fee2e2;
  color: #dc2626;
  border: 1px solid #fca5a5;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  border-radius: 999px;
  transition: all var(--transition);
}
.btn-danger:hover { background: #dc2626; color: #fff; border-color: #dc2626; }

.btn-small {
  background: var(--surface-2);
  color: var(--muted);
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 0.3rem 0.8rem;
  font-size: 0.82rem;
  border-radius: 6px;
  font-family: inherit;
  transition: all var(--transition);
}
.btn-small:hover { border-color: var(--primary); color: var(--primary); }

.admin-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.admin-form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.admin-form-section {
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}
.admin-form-section h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.admin-form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.admin-form-actions .btn { padding: 0.8rem 2rem; font-size: 0.95rem; }
.image-preview { margin-top: 0.8rem; }
.image-preview img { max-width: 200px; max-height: 140px; object-fit: cover; border-radius: var(--radius-xs); border: 1px solid var(--border); }
.image-preview .preview-label { display: block; font-size: 0.8rem; color: var(--muted); margin-top: 0.3rem; }

.image-preview-grid {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.8rem;
}
.image-preview-grid img { width: 100%; height: 90px; object-fit: cover; border-radius: var(--radius-xs); border: 1px solid var(--border); }

.admin-message {
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-xs);
  margin-bottom: 1rem;
  font-weight: 500;
  font-size: 0.92rem;
  animation: fadeIn 0.3s ease;
}
.admin-message-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.admin-message-error { background: #fef2f2; color: #991b1b; border: 1px solid #fca5a5; }
.admin-message-info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
/* =========== 响应式补充 =========== */
@media (max-width: 860px) {
  .cases-grid-dynamic { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-detail-meta-grid { grid-template-columns: 1fr; }
  .case-detail-images { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .admin-case-item { flex-direction: column; align-items: flex-start; }
  .admin-case-thumb { width: 100%; height: 160px; }
  .admin-case-info p { white-space: normal; }
  .admin-form-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .cases-grid-dynamic { grid-template-columns: 1fr; }
  .case-detail-full { padding: 1.2rem; }
  .case-filter-btn { padding: 0.4rem 0.8rem; font-size: 0.82rem; }
  .admin-header .container { flex-direction: column; align-items: flex-start; }
  .admin-actions { width: 100%; }
  .admin-actions .btn { flex: 1; text-align: center; font-size: 0.8rem; padding: 0.5rem 0.6rem; }
}

/* =========== 博客样式 =========== */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.blog-card:hover {
  border-color: var(--primary);
  box-shadow: 0 20px 48px rgba(17, 32, 51, 0.1);
}

.blog-card-content { padding: 1.5rem; }

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.blog-category {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.78rem;
}

.blog-date { color: var(--muted); font-size: 0.85rem; }

.blog-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  color: var(--text);
}

.blog-card-summary {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 0.8rem;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
}

.blog-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.blog-read-more {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: color var(--transition);
}
.blog-read-more:hover { color: var(--primary-2); }

.blog-card-expanded {
  padding: 0 1.5rem 1.5rem;
  border-top: 1px solid var(--border);
  animation: fadeIn 0.3s ease;
}

.blog-full-content {
  padding: 1.2rem 0;
  line-height: 1.9;
  color: var(--text);
}
.blog-full-content p { margin-bottom: 1rem; }
.blog-full-content h3 { font-size: 1.1rem; margin: 1.2rem 0 0.5rem; }
.blog-full-content ul, .blog-full-content ol { padding-left: 1.5rem; margin: 0.5rem 0 1rem; color: var(--muted); }
.blog-full-content li { padding: 0.2rem 0; }
.blog-full-content strong { color: var(--text); }

.blog-collapse-btn {
  margin-top: 0.5rem;
}

/* =========== 404页面样式 =========== */
.error-page {
  text-align: center;
  padding: 4rem 0;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.error-page .error-code {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 1rem;
}
.error-page h1 { margin-bottom: 0.5rem; }
.error-page p { color: var(--muted); max-width: 480px; margin-bottom: 1.5rem; font-size: 1rem; }
.error-page .btn { margin: 0 0.4rem; }

/* =========== CTA 脉冲动画 =========== */
.btn-pulse {
  animation: pulse-glow 2s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 10px 24px rgba(21, 93, 252, 0.18); }
  50% { box-shadow: 0 14px 36px rgba(21, 93, 252, 0.35), 0 0 0 8px rgba(21, 93, 252, 0.06); }
}

/* =========== 滚动入场动画 =========== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}
/* 子元素逐项延迟动画 */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.35s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.4s; opacity: 1; transform: translateY(0); }

/* =========== 卡片增强 hover 效果 =========== */
.card, .benefit-card, .step, .content-card {
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.3s ease, border-color var(--transition);
}
.card:hover, .benefit-card:hover, .case-card:hover, .step:hover, .content-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(17, 32, 51, 0.12);
  border-color: var(--primary);
}
.step:hover { box-shadow: 0 16px 32px rgba(17, 32, 51, 0.1); }

/* =========== 回到顶部按钮 =========== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  box-shadow: 0 8px 24px rgba(21, 93, 252, 0.3);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 12px 30px rgba(21, 93, 252, 0.4);
}

/* =========== 移动端汉堡菜单 =========== */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}
.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: all 0.3s ease;
}
.hamburger-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger-btn.active span:nth-child(2) { opacity: 0; }
.hamburger-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* =========== 增强案例占位图 =========== */
.case-card-placeholder-enhanced {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: linear-gradient(135deg, #e8f0fe 0%, #f0f4ff 40%, #eef2ff 70%, #f5f7fb 100%);
}
.case-card-placeholder-enhanced .placeholder-icon {
  font-size: 2.2rem;
  margin-bottom: 0.2rem;
}
.case-card-placeholder-enhanced span {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
}

/* =========== 增强 Footer =========== */
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-col ul li a {
  color: var(--muted);
  font-size: 0.88rem;
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--primary); }
.footer-social {
  display: flex;
  gap: 0.8rem;
  margin-top: 1rem;
}
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
  color: var(--muted);
}
.footer-social a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.2rem;
  margin-top: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-bottom-links {
  display: flex;
  gap: 1.2rem;
}
.footer-bottom-links a {
  color: var(--muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}
.footer-bottom-links a:hover { color: var(--primary); }


/* =========== 子分类筛选标签 case-sub-filter（cases.html专用） =========== */
.case-sub-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 auto 2rem auto;  /* 左右auto实现整体居中 */
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  justify-content: center;
}

.case-sub-tab {
  padding: 0.5rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--muted);
  background: var(--surface);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  display: inline-block;
}

.case-sub-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.case-sub-tab.case-sub-active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* =========== 案例卡片布局与缩略图样式 =========== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.8rem;
  margin-bottom: 2.5rem;
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 24px 56px rgba(17, 32, 51, 0.14);
  border-color: var(--primary);
}

.case-card-thumb {
  position: relative;
  width: 100%;
  padding-top: 100%;
  overflow: hidden;
  background: var(--surface-2);
}

.case-card-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.case-card:hover .case-card-thumb img {
  transform: scale(1.05);
}

.case-card h3 {
  padding: 1rem 1.2rem 0.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.case-card p {
  padding: 0 1.2rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-card .card-link {
  display: block;
  padding: 0.8rem 1.2rem 1.2rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--primary);
}

.case-card .card-link:hover {
  text-decoration: underline;
}

/* 移动端适配，和你现有媒体查询规范统一 */
@media (max-width: 860px) {
  .case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 600px) {
  .case-grid {
    grid-template-columns: 1fr;
  }
  .case-sub-filter {
    gap: 0.4rem;
  }
  .case-sub-tab {
    padding: 0.4rem 0.8rem;
    font-size: 0.82rem;
  }
}