/* ==========================================================================
   豆包全模态 AI 平台样式体系
   视觉风格：设备横截面剖面 · 冷金属银 + 剖面橙 (Metallic Silver & Section Orange)
   ========================================================================== */

:root {
  /* 冷金属银与工程底色 */
  --silver-bg: #F8FAFC;
  --silver-surface: #FFFFFF;
  --silver-subtle: #F1F5F9;
  --silver-border: #E2E8F0;
  --silver-border-hover: #CBD5E1;
  --silver-wireframe: #94A3B8;

  /* 剖面激光橙与切片高光 */
  --orange-primary: #FF6B00;
  --orange-deep: #EA580C;
  --orange-light: #FF8A3D;
  --orange-surface: #FFF7ED;
  --orange-border: #FDBA74;
  --orange-glow: rgba(255, 107, 0, 0.28);
  --orange-tag: #C2410C;

  /* 辅助与文字深色系 */
  --text-title: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 24px -4px rgba(15, 23, 42, 0.08), 0 4px 10px -2px rgba(255, 107, 0, 0.04);
  --shadow-lg: 0 20px 36px -8px rgba(15, 23, 42, 0.12), 0 6px 16px -4px rgba(255, 107, 0, 0.1);
  --shadow-glow: 0 10px 25px -3px rgba(255, 107, 0, 0.38);

  --container-width: 1220px;
  --nav-height: 68px;
  --transition: all 0.26s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  scroll-behavior: smooth;
  background-color: var(--silver-bg);
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background-color: var(--silver-bg);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 1. 顶部导航栏 (Sticky Nav) */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.header-container {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.brand-logo-text {
  font-size: 19px;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 11px;
  font-weight: 700;
  background: var(--orange-surface);
  color: var(--orange-tag);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--orange-border);
}

.nav-links-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link-item {
  position: relative;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-body);
  padding: 6px 0;
}

.nav-link-item::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange-primary), #FF8A3D);
  border-radius: 2px;
  transition: width 0.25s ease, transform 0.25s ease;
  transform: translateX(-50%);
}

.nav-link-item:hover {
  color: var(--orange-primary);
}

.nav-link-item:hover::after,
.nav-link-item.active::after {
  width: 100%;
}

.nav-actions-group {
  display: flex;
  align-items: center;
  gap: 18px;
}

.sub-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.sub-link:hover {
  color: var(--orange-primary);
}

.btn-cta-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--orange-primary) 0%, var(--orange-deep) 100%);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-glow);
  transition: var(--transition);
}

.btn-cta-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 107, 0, 0.45);
}

/* 按钮通用 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--orange-primary) 0%, var(--orange-deep) 100%);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-glow);
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 107, 0, 0.45);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #FFFFFF;
  color: var(--text-body);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  border: 1.5px solid #CBD5E1;
  transition: var(--transition);
}

.btn-ghost:hover {
  border-color: var(--orange-primary);
  color: var(--orange-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* 2. 首屏展示区 (Hero Section) */
.hero-section {
  padding: 68px 0 84px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--silver-bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--orange-surface);
  border: 1px solid var(--orange-border);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  color: var(--orange-tag);
  margin-bottom: 22px;
}

.pulse-orange-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange-primary);
  box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.7);
  animation: pulseOrange 2s infinite;
}

@keyframes pulseOrange {
  0% { box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(255, 107, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 107, 0, 0); }
}

.hero-title {
  font-size: 52px;
  line-height: 1.16;
  letter-spacing: -1.2px;
  font-weight: 900;
  color: var(--text-title);
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, #FF6B00 0%, #EA580C 50%, #0F172A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subheadline {
  font-size: 17.5px;
  line-height: 1.68;
  color: #6B7280;
  max-width: 530px;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 30px;
}

.hero-trust-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-icon-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: var(--orange-surface);
  color: var(--orange-primary);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 800;
  border: 1px solid var(--orange-border);
}

/* 剖面解剖风：设备横截面剖面卡片（从外到内：电脑版、网页版、对话核） */
.cross-section-container {
  background: #FFFFFF;
  border-radius: 22px;
  border: 1.5px solid var(--silver-border);
  box-shadow: var(--shadow-lg);
  padding: 22px;
  position: relative;
  overflow: hidden;
}

.section-top-indicator {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px dashed var(--silver-border);
  padding-bottom: 12px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

.xray-badge {
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  color: #475569;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
  font-family: monospace;
}

/* 三层横截面装配体 */
.concentric-layers-shell {
  position: relative;
  border-radius: 16px;
  padding: 16px;
  background: linear-gradient(145deg, #F8FAFC 0%, #EDF2F7 100%);
  border: 2px solid #CBD5E1; /* 外层：电脑版外壳 */
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.03);
}

.layer-tag-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 800;
  color: #475569;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.concentric-layers-mid {
  border-radius: 14px;
  padding: 16px;
  background: #FFFFFF;
  border: 2px solid #94A3B8; /* 中层：网页版无界流 */
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
}

.concentric-layers-core {
  border-radius: 12px;
  padding: 18px;
  background: radial-gradient(circle at 50% 50%, #FFF7ED 0%, #FFFFFF 100%);
  border: 2px solid var(--orange-primary); /* 内层核心：全模态对话核 */
  box-shadow: 0 0 20px rgba(255, 107, 0, 0.15);
  position: relative;
}

.core-laser-line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange-primary), transparent);
}

.cross-section-preview-img {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #E2E8F0;
  margin-bottom: 12px;
}

.cross-section-preview-img img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.core-metrics-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #FFFFFF;
  border: 1px solid var(--orange-border);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
}

.core-tag-pill {
  font-size: 11px;
  font-weight: 700;
  color: var(--orange-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 3. 核心能力矩阵 (Bento Box Grid 4 列网格) */
.bento-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}

.section-head-center {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--orange-tag);
  background: var(--orange-surface);
  border: 1px solid var(--orange-border);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}

.section-h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.6px;
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-muted);
}

.bento-box-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.bento-card {
  background: #FFFFFF;
  border: 1px solid #E8EDF5;
  border-radius: 18px;
  padding: 24px 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.bento-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--orange-border);
}

.bento-icon-container {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--orange-surface);
  border: 1px solid var(--orange-border);
  color: var(--orange-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.bento-icon-container svg {
  width: 24px;
  height: 24px;
  stroke: var(--orange-primary);
}

.bento-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
}

.bento-card-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex-grow: 1;
}

.bento-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--orange-primary);
  transition: gap 0.2s ease;
}

.bento-card:hover .bento-card-link {
  gap: 10px;
}

/* 4. 深度工作流 (Dark Mode Showcase) */
.dark-section {
  padding: 96px 0;
  background-color: #0A0F1D;
  position: relative;
  overflow: hidden;
  color: #FFFFFF;
}

.dark-radial-glow {
  position: absolute;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 520px;
  background: radial-gradient(circle, rgba(255, 107, 0, 0.22) 0%, rgba(10, 15, 29, 0) 70%);
  pointer-events: none;
}

.dark-section .section-h2 {
  color: #FFFFFF;
}

.dark-section .section-desc {
  color: #94A3B8;
}

.flow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
  position: relative;
}

.flow-step-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  transition: var(--transition);
}

.flow-step-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 107, 0, 0.5);
  transform: translateY(-4px);
}

.flow-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--orange-primary) 0%, #EA580C 100%);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 18px;
  box-shadow: 0 0 16px rgba(255, 107, 0, 0.4);
}

.flow-step-title {
  font-size: 17px;
  font-weight: 700;
  color: #F8FAFC;
  margin-bottom: 8px;
}

.flow-step-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: #94A3B8;
}

/* 5. 场景/用例对比 (Tabs Showcase) */
.tabs-showcase-section {
  padding: 90px 0;
  background-color: var(--silver-bg);
}

.tabs-controller {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-pill-btn {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  background: #FFFFFF;
  color: var(--text-body);
  border: 1px solid #E2E8F0;
  transition: var(--transition);
}

.tab-pill-btn:hover {
  border-color: var(--orange-border);
  color: var(--orange-primary);
}

.tab-pill-btn.active {
  background: var(--orange-primary);
  color: #FFFFFF;
  border-color: var(--orange-primary);
  box-shadow: var(--shadow-glow);
}

.tab-content-panel {
  display: none;
}

.tab-content-panel.active {
  display: block;
}

.split-box-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  background: #FFFFFF;
  border: 1px solid var(--silver-border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.split-col-input {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 14px;
  padding: 24px;
}

.split-col-output {
  background: var(--orange-surface);
  border: 1.5px solid var(--orange-border);
  border-radius: 14px;
  padding: 24px;
}

.split-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 700;
}

.split-col-input .split-col-header {
  color: #64748B;
}

.split-col-output .split-col-header {
  color: var(--orange-tag);
}

.bubble-text-preview {
  font-size: 14px;
  line-height: 1.68;
  color: var(--text-body);
}

.output-highlight-badge {
  display: inline-block;
  background: #FFEDD5;
  color: #9A3412;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
}

/* 6. 阶梯定价方案 (Pricing Table) */
.pricing-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid var(--orange-primary);
  box-shadow: 0 16px 36px -6px rgba(255, 107, 0, 0.2);
}

.overflow-badge-hot {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--orange-primary), #EA580C);
  color: #FFFFFF;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 10px rgba(255, 107, 0, 0.35);
  white-space: nowrap;
}

.plan-tier-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 6px;
}

.plan-tier-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.plan-price-row {
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price-num {
  font-size: 34px;
  font-weight: 900;
  color: var(--text-title);
  letter-spacing: -1px;
}

.plan-price-period {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--text-body);
}

.feat-supported {
  color: var(--orange-primary);
  font-weight: 800;
}

.feat-unsupported {
  color: #CBD5E1;
  font-weight: 700;
}

.pricing-banner-showcase {
  margin-top: 56px;
  background: var(--silver-bg);
  border-radius: 18px;
  border: 1px solid var(--silver-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.pricing-banner-info {
  padding: 36px 40px;
}

.pricing-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 7. 疑虑打消与常见问题 (FAQ Accordion) */
.faq-section {
  padding: 90px 0;
  background-color: var(--silver-bg);
}

.faq-accordion-box {
  max-width: 860px;
  margin: 0 auto;
}

.faq-detail-item {
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  margin-bottom: 14px;
  background: #FFFFFF;
  overflow: hidden;
  transition: var(--transition);
}

.faq-detail-item[open] {
  border-color: var(--orange-border);
  box-shadow: var(--shadow-sm);
}

.faq-summary {
  list-style: none;
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-title);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon-toggle {
  font-size: 20px;
  font-weight: 400;
  color: var(--orange-primary);
  transition: transform 0.2s ease;
}

.faq-detail-item[open] .faq-icon-toggle::before {
  content: "−";
}

.faq-detail-item:not([open]) .faq-icon-toggle::before {
  content: "+";
}

.faq-content-inner {
  padding: 0 24px 22px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-muted);
  border-top: 1px dashed #F1F5F9;
  padding-top: 14px;
}

.faq-step-list {
  list-style: none;
  margin-top: 10px;
}

.faq-step-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.faq-step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--orange-surface);
  color: var(--orange-tag);
  font-size: 11px;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 2px;
  border: 1px solid var(--orange-border);
}

/* 8. 页脚与合规 (Footer) */
.site-footer {
  background-color: #101827;
  color: #94A3B8;
  padding: 72px 0 36px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  padding-bottom: 54px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #FFFFFF;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 14px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.65;
  color: #64748B;
  max-width: 320px;
  margin-bottom: 20px;
}

.footer-col-title {
  font-size: 14.5px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
}

.footer-links-list {
  list-style: none;
}

.footer-links-list li {
  margin-bottom: 10px;
}

.footer-links-list a {
  font-size: 13.5px;
  color: #94A3B8;
}

.footer-links-list a:hover {
  color: #FB923C;
}

.footer-bottom-legal {
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.45);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

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

/* 内页定制样式 */
.subpage-hero {
  padding: 56px 0 40px;
  text-align: center;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--silver-bg) 100%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.subpage-h1 {
  font-size: 38px;
  font-weight: 900;
  color: var(--text-title);
  letter-spacing: -0.8px;
  margin-bottom: 12px;
}

.subpage-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

.web-app-frame-card {
  background: #FFFFFF;
  border-radius: 20px;
  border: 1px solid var(--silver-border);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  margin: 40px auto;
  max-width: 1080px;
}

.web-app-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  min-height: 540px;
}

.web-app-sidebar {
  background: #F8FAFC;
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.web-app-chatarea {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid #E2E8F0;
  border-radius: 14px;
  padding: 24px;
}

.help-grid-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  margin: 50px auto 90px;
}

.help-sidebar-nav {
  position: sticky;
  top: 90px;
  background: #FFFFFF;
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--silver-border);
  box-shadow: var(--shadow-sm);
}

.help-nav-link {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  margin-bottom: 4px;
}

.help-nav-link.active,
.help-nav-link:hover {
  background: var(--orange-surface);
  color: var(--orange-tag);
  font-weight: 600;
}

.help-article-content {
  background: #FFFFFF;
  border-radius: 18px;
  padding: 40px;
  border: 1px solid var(--silver-border);
  box-shadow: var(--shadow-sm);
}

.help-article-content h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-title);
  margin-top: 36px;
  margin-bottom: 16px;
}

.help-article-content h2:first-child {
  margin-top: 0;
}

.help-article-content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  margin-bottom: 16px;
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .bento-box-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-banner-showcase {
    grid-template-columns: 1fr;
  }
  .split-box-card {
    grid-template-columns: 1fr;
  }
  .help-grid-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: 0 16px;
  }
  .nav-links-menu {
    display: none;
  }
  .hero-title {
    font-size: 34px;
  }
  .bento-box-grid {
    grid-template-columns: 1fr;
  }
  .flow-steps-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom-legal {
    flex-direction: column;
    align-items: flex-start;
  }
  .web-app-grid {
    grid-template-columns: 1fr;
  }
}