/* ========================================
   千变刻画科技 - 案例页面共享样式
   企业官网风格设计语言
   ======================================== */

/* --- CSS Variables --- */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f7f8fa;
  --color-bg-tertiary: #ffffff;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #6b7280;
  --color-accent: #0052d9;
  --color-accent-hover: #0046bd;
  --color-accent-light: #e8f1ff;
  --color-border: #d1d5db;
  --color-border-light: #e5e7eb;
  --color-success: #30d158;
  --color-warning: #ff9f0a;
  --color-danger: #ff453a;
  --color-card-shadow: rgba(17,24,39,0.08);
  --color-hero-overlay: rgba(4,12,28,0.62);
  --radius-sm: 8px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --radius-xl: 8px;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Noto Sans SC", sans-serif;
  --max-width: 1100px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 68px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-system);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  letter-spacing: 0;
  padding-top: 52px;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--color-accent-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Top Navigation Bar --- */
.case-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  background: rgba(255,255,255,0.94);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: 0 8px 24px rgba(17,24,39,0.04);
  padding: 0 24px;
}
.case-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}
.case-nav-back {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  cursor: pointer;
}
.case-nav-back svg {
  width: 18px;
  height: 18px;
}
.case-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 460px;
}

/* --- Hero Section --- */
.case-hero {
  position: relative;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #ffffff;
  overflow: hidden;
}
.case-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.case-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(4,12,28,0.82), rgba(4,12,28,0.46));
}
.case-hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 60px 24px;
}
.case-hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.14);
  backdrop-filter: blur(10px);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 20px;
}
.case-hero h1 {
  font-size: clamp(2.6rem, 5vw, 4.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0;
  margin-bottom: 16px;
}
.case-hero-sub {
  font-size: 1.15rem;
  font-weight: 400;
  opacity: 0.88;
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Section Common --- */
.case-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 72px 24px;
}
.case-section-sm {
  padding: 48px 24px;
}
.case-section-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.case-section h2 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0;
  margin-bottom: 24px;
  color: var(--color-text);
}
.case-section h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

/* --- Three-Column Layout (Challenge / Solution / Result) --- */
.case-three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 72px;
}
.case-col {
  background: var(--color-bg-tertiary);
  border-radius: 8px;
  padding: 36px 28px;
  border: 1px solid var(--color-border-light);
}
.case-col-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}
.case-col-icon.challenge { background: #fff2f0; color: var(--color-danger); }
.case-col-icon.solution { background: var(--color-accent-light); color: var(--color-accent); }
.case-col-icon.result { background: #e8f8ee; color: var(--color-success); }

.case-col h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}
.case-col ul {
  list-style: none;
  padding: 0;
}
.case-col li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 0.92rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}
.case-col li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
}
.case-col.challenge-col li::before { background: var(--color-danger); }
.case-col.solution-col li::before { background: var(--color-accent); }
.case-col.result-col li::before { background: var(--color-success); }

/* --- KPI Cards --- */
.case-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 72px;
}
.case-kpi-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  padding: 28px 22px;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.case-kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-card-shadow);
}
.case-kpi-number {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--color-accent);
  line-height: 1.1;
}
.case-kpi-number.success { color: var(--color-success); }
.case-kpi-number.danger { color: var(--color-danger); }
.case-kpi-number.warning { color: var(--color-warning); }
.case-kpi-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
  line-height: 1.4;
}

/* --- Architecture Diagram Placeholder --- */
.case-arch {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 72px;
}
.case-arch-diagram {
  background: var(--color-bg-tertiary);
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  padding: 48px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 180px;
  position: relative;
}
.case-arch-diagram::before {
  content: '方案架构示意图';
  position: absolute;
  top: 14px;
  left: 20px;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}
.case-arch-node {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
  min-width: 90px;
  box-shadow: 0 2px 8px var(--color-card-shadow);
}
.case-arch-node.accent {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}
.case-arch-arrow {
  font-size: 1.2rem;
  color: var(--color-border);
  font-weight: 300;
}

/* --- Gallery --- */
.case-gallery {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 72px;
}
.case-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.case-gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-tertiary);
}
.case-gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}
.case-gallery-placeholder {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e8e8ed 0%, #f5f5f7 50%, #e0e0e5 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.82rem;
}

/* --- CTA Section --- */
.case-cta {
  background: linear-gradient(135deg, #042451, var(--color-accent));
  text-align: center;
  padding: 72px 24px;
  color: #ffffff;
}
.case-cta h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0;
}
.case-cta p {
  font-size: 1rem;
  color: rgba(255,255,255,0.78);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.case-cta-btn {
  display: inline-block;
  background: var(--color-accent);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 36px;
  border-radius: 4px;
  transition: background 0.2s ease, transform 0.15s ease;
  cursor: pointer;
  border: none;
}
.case-cta-btn:hover {
  background: var(--color-accent-hover);
  transform: scale(1.03);
  color: #ffffff;
}

/* --- Footer --- */
.case-footer {
  background: var(--color-bg-tertiary);
  border-top: 1px solid var(--color-border-light);
  padding: 32px 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}
.case-footer a {
  color: var(--color-text-secondary);
}
.case-footer a:hover {
  color: var(--color-accent);
}

/* --- Detail Table (for equipment lists) --- */
.case-detail-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 16px;
}
.case-detail-table th,
.case-detail-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}
.case-detail-table th {
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --- Delivery Proof --- */
.case-proof-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 72px;
}
.case-proof-head {
  max-width: 720px;
  margin-bottom: 24px;
}
.case-proof-head p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.case-proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.case-proof-card {
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  background: var(--color-bg);
  padding: 24px 22px;
}
.case-proof-card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
}
.case-proof-card ul {
  list-style: none;
}
.case-proof-card li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  color: var(--color-text-secondary);
  font-size: 0.86rem;
  line-height: 1.55;
}
.case-proof-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}
.case-doc-strip {
  margin-top: 18px;
  padding: 18px 20px;
  border-radius: 8px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.case-doc-strip span {
  padding: 5px 10px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
  font-size: 0.78rem;
}
.case-cta-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.case-cta-secondary {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.36);
}
.case-cta-secondary:hover {
  background: rgba(255,255,255,0.2);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .case-hero h1 { font-size: 2rem; }
  .case-three-col { grid-template-columns: 1fr; }
  .case-proof-grid { grid-template-columns: 1fr; }
  .case-kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .case-gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .case-section { padding: 48px 20px; }
  .case-section h2 { font-size: 1.5rem; }
}

@media (max-width: 540px) {
  .case-hero { min-height: 320px; }
  .case-hero h1 { font-size: 1.55rem; }
  .case-hero-sub { font-size: 0.95rem; }
  .case-kpi-grid { grid-template-columns: 1fr; }
  .case-gallery-grid { grid-template-columns: 1fr; }
  .case-nav-title { display: none; }
  .case-arch-diagram { flex-direction: column; }
  .case-arch-arrow { transform: rotate(90deg); }
}

/* --- Print --- */
@media print {
  .case-nav, .case-cta, .case-footer { display: none; }
  .case-hero { min-height: auto; color: #000; }
  .case-hero-overlay { display: none; }
  .case-hero-bg { display: none; }
}