/* ========== 基础变量 ========== */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #EFF6FF;
  --bg: #FFFFFF;
  --bg-alt: #F8FAFC;
  --text: #0F172A;
  --text-light: #64748B;
  --border: #E2E8F0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

code {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.9em;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.brand-logo { width: 36px; height: 36px; border-radius: 6px; object-fit: contain; }

.navbar-links {
  display: flex;
  gap: 28px;
}

.navbar-links a {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
}

.navbar-links a:hover { color: var(--primary); }

/* ========== Hero ========== */
.hero {
  padding: 140px 24px 80px;
  text-align: center;
  background: linear-gradient(135deg, #1E3A8A 0%, #2563EB 50%, #3B82F6 100%);
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(255,255,255,0.05) 0%, transparent 40%);
  pointer-events: none;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 48px;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-align: center;
}

.hero .btn-primary {
  background: #FFFFFF;
  color: var(--primary);
}

.hero .btn-primary:hover {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.3);
}

.hero .btn-outline {
  background: transparent;
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.hero .btn-outline:hover {
  border-color: #FFFFFF;
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

.btn-lg { padding: 14px 44px; font-size: 16px; }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat-item { text-align: center; }

.hero .stat-num {
  font-size: 28px;
  font-weight: 800;
  color: #FFFFFF;
}

.hero .stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 4px;
}

/* ========== 通用段落 ========== */
.section {
  padding: 80px 24px;
}

.section-alt { background: var(--bg-alt); }

.section-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 48px;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* ========== 功能特性 ========== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.2s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ========== 界面预览 ========== */
.ui-preview {
  max-width: 800px;
  margin: 0 auto;
}

.ui-mockup {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.mock-titlebar {
  background: #E8EAED;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #FF5F57; }
.dot-yellow { background: #FEBC2E; }
.dot-green { background: #28C840; }

.mock-title {
  flex: 1;
  text-align: center;
  font-size: 13px;
  color: #5F6368;
  font-weight: 500;
}

.mock-body {
  display: flex;
  background: #F5F7FA;
  min-height: 340px;
}

.mock-left {
  width: 220px;
  background: #FFFFFF;
  border-right: 1px solid var(--border);
  padding: 14px;
}

.mock-panel-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mock-file-item {
  padding: 7px 10px;
  border-radius: 5px;
  font-size: 12px;
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mock-excel { background: #E8F5E9; color: #2E7D32; }
.mock-word { background: #E3F2FD; color: #1565C0; }

.mock-btns {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mock-btn {
  padding: 7px 12px;
  border-radius: 5px;
  font-size: 12px;
  text-align: center;
  font-weight: 600;
  color: #FFFFFF;
}

.btn-green { background: #27AE60; }
.btn-blue { background: #3498DB; }
.btn-red { background: #FFFFFF; color: #E74C3C; border: 1px solid #E74C3C; }
.btn-gray { background: #FFFFFF; color: #95A5A6; border: 1px solid #D5DBDB; }

.mock-right {
  flex: 1;
  background: #F5F7FA;
  padding: 14px;
  overflow: auto;
}

.mock-group {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 10px;
}

.mock-group-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid #F0F2F5;
}

.mock-table {
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 6px;
  font-size: 11px;
}

.mock-table-header {
  display: flex;
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 700;
}

.mock-table-header span,
.mock-table-row span {
  flex: 1;
  padding: 5px 8px;
}

.mock-table-row {
  display: flex;
  border-bottom: 1px solid #F0F2F5;
}

.mock-placeholder-info {
  background: #FFF8E1;
  border: 1px solid #FFE082;
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 11px;
  color: var(--text-light);
  margin-bottom: 8px;
}

.mock-placeholders {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.ph-tag {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-family: "Consolas", monospace;
  font-weight: 600;
}

.mock-generate-bar { margin-top: 8px; }

.mock-btn-gen {
  background: var(--primary);
  color: #FFFFFF;
  padding: 8px 28px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.mock-progress {
  background: #F0F0F0;
  border-radius: 4px;
  height: 14px;
  overflow: hidden;
}

.mock-progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.3s;
}

/* ========== 使用指南 ========== */
.steps {
  max-width: 700px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 20px;
  margin-bottom: 36px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.step-content p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

.step-note {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 6px;
}

.example-table {
  margin-top: 12px;
  overflow-x: auto;
}

.example-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border-radius: 8px;
  overflow: hidden;
}

.example-table th {
  background: var(--primary);
  color: #FFFFFF;
  padding: 10px 16px;
  text-align: left;
  font-weight: 600;
}

.example-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.example-table tr:last-child td { border-bottom: none; }
.example-table tr:hover td { background: var(--primary-light); }

.template-example { margin-top: 12px; }

.template-doc {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  line-height: 2;
  font-size: 14px;
  box-shadow: var(--shadow);
}

.ph-highlight {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: "Consolas", monospace;
  font-weight: 600;
  border: 1px dashed var(--primary);
}

/* ========== 技术参数 ========== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tech-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all 0.2s;
}

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

.tech-icon { font-size: 36px; margin-bottom: 10px; }

.tech-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.tech-desc {
  font-size: 13px;
  color: var(--text-light);
}

/* ========== 下载 ========== */
.download-box {
  text-align: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 32px;
  max-width: 520px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.download-icon { font-size: 48px; margin-bottom: 16px; }

.download-box h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-box p {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 24px;
}

.download-meta {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-light);
}

.download-meta span { margin: 0 4px; }

/* ========== 页脚 ========== */
.footer {
  background: #0F172A;
  color: rgba(255, 255, 255, 0.6);
  padding: 40px 24px;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
}

.brand-logo-sm { width: 50px; height: 50px; border-radius: 8px; object-fit: contain; }

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s;
}

.footer-links a:hover { color: #FFFFFF; }

.footer-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 20px 0;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.footer-icp a {
  color: rgba(255, 255, 255, 0.4);
}

.footer-icp a:hover { color: rgba(255, 255, 255, 0.7); }

/* ========== 响应式 ========== */
@media (max-width: 900px) {
  .hero-title { font-size: 32px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .mock-body { flex-direction: column; }
  .mock-left { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
  .footer-top, .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .navbar-links { gap: 16px; }
}

@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 28px; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 22px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .navbar-links { display: none; }
}