/* ==========================================================================
   肯の机 (kendeji.lat) - 生产力级文具拟物工作台 UI 样式表
   Design System: Notion / Craft / Analog Stationery Document-Editor Aesthetic
   Palette: Warm Alabaster (#f7f7f5), Notebook Border (#e5e5e3), Slate-Black (#191919)
   ========================================================================== */

:root {
  /* 字体家族：极简文档编辑器系统字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --font-serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, serif;

  /* 白天模式 (Warm Stationery / Document Editor) */
  --bg-canvas: #f7f7f5;          /* 温暖雪花石膏纸张色 warm alabaster */
  --bg-card: #ffffff;            /* 纯净便签纸白 */
  --bg-card-subtle: #fbfbfa;     /* 微弱纸张分层底色 */
  --bg-glass: rgba(247, 247, 245, 0.92);
  --border-notebook: #e5e5e3;    /* 记事本边框灰 crisp notebook grey */
  --border-notebook-hover: #c7c7c3;
  --border-perforation: #d4d4d0; /* 打孔装订线颜色 */

  --text-main: #191919;          /* 浓墨黑 slate-black typography */
  --text-body: #37352f;          /* 文档正文字色 */
  --text-secondary: #6f6e69;     /* 次级灰调说明字 */
  --text-muted: #9b9a97;         /* 批注弱灰字 */
  --text-accent: #0f172a;        /* 重点加深色 */

  /* 文具质感点缀色 (Analog Stationery Highlighter) */
  --hl-yellow: #fef08a;          /* 荧光笔黄 */
  --hl-yellow-text: #854d0e;
  --hl-blue: #e0f2fe;            /* 记事贴浅蓝 */
  --hl-blue-text: #0369a1;
  --hl-green: #dcfce7;           /* 验讫章青绿 */
  --hl-green-text: #15803d;
  --hl-coral: #fee2e2;           /* 印章珊瑚红 */
  --hl-coral-text: #b91c1c;

  /* 模拟实体文具贴纸贴标按钮 (Analog Matte Stationery Sticker) */
  --sticker-btn-bg: #232323;
  --sticker-btn-text: #f7f7f5;
  --sticker-btn-border: #111111;
  --sticker-btn-shadow: 0 2px 0 #000000;

  --sticker-subtle-bg: #ffffff;
  --sticker-subtle-text: #191919;
  --sticker-subtle-border: #d4d4d0;
  --sticker-subtle-shadow: 0 2px 0 #d4d4d0;

  /* 纸张微投影 */
  --shadow-paper: 0 1px 2px rgba(15, 15, 15, 0.04), 0 4px 12px rgba(15, 15, 15, 0.03);
  --shadow-paper-hover: 0 3px 6px rgba(15, 15, 15, 0.06), 0 8px 24px rgba(15, 15, 15, 0.05);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition-smooth: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 夜间模式 (Charcoal Dark Workspace) */
[data-theme="dark"] {
  --bg-canvas: #191919;          /* 深炭黑文档编辑底色 */
  --bg-card: #202020;            /* 深灰工作台卡片 */
  --bg-card-subtle: #262626;     /* 卡片二级分层 */
  --bg-glass: rgba(25, 25, 25, 0.92);
  --border-notebook: #333332;    /* 记事本深色格线 */
  --border-notebook-hover: #484846;
  --border-perforation: #3f3f3d;

  --text-main: #f1f1ef;          /* 清晰象牙白文字 */
  --text-body: #d4d4d2;          /* 正文 */
  --text-secondary: #9b9a97;     /* 辅助说明 */
  --text-muted: #6f6e69;         /* 弱化备注 */
  --text-accent: #ffffff;

  --hl-yellow: rgba(254, 240, 138, 0.16);
  --hl-yellow-text: #fef08a;
  --hl-blue: rgba(224, 242, 254, 0.16);
  --hl-blue-text: #7dd3fc;
  --hl-green: rgba(220, 252, 231, 0.16);
  --hl-green-text: #86efac;
  --hl-coral: rgba(254, 226, 226, 0.16);
  --hl-coral-text: #fca5a5;

  --sticker-btn-bg: #f1f1ef;
  --sticker-btn-text: #191919;
  --sticker-btn-border: #ffffff;
  --sticker-btn-shadow: 0 2px 0 #a3a3a3;

  --sticker-subtle-bg: #272727;
  --sticker-subtle-text: #f1f1ef;
  --sticker-subtle-border: #3f3f3d;
  --sticker-subtle-shadow: 0 2px 0 #1a1a1a;

  --shadow-paper: 0 1px 3px rgba(0, 0, 0, 0.4), 0 6px 16px rgba(0, 0, 0, 0.3);
  --shadow-paper-hover: 0 4px 8px rgba(0, 0, 0, 0.5), 0 12px 28px rgba(0, 0, 0, 0.45);
}

/* ==========================================================================
   基础排版与平滑锚点控制
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px; /* 锚点跳转平滑定位，避免被顶部导航栏遮挡 */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-body);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

button, input {
  font-family: inherit;
  font-size: inherit;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

/* 模块化标题区 (Notion Header Block Style) */
.section-header-block {
  margin-bottom: 48px;
  border-left: 3px solid var(--text-main);
  padding-left: 18px;
}

.section-tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-main-heading {
  font-size: 1.95rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.section-summary-lead {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.68;
  max-width: 780px;
}

/* ==========================================================================
   顶部页眉与完整导航目录 (Header / Catalog Navigation)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-notebook);
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

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

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-logo-img {
  height: 38px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-smooth);
}

.site-logo-img:hover {
  transform: translateY(-1px);
}

.brand-notebook-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-notebook);
  font-weight: 600;
}

/* 导航目录：首页 + 每个板块锚点 + 推荐资讯 */
.nav-catalog {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-item-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-smooth), background-color var(--transition-smooth);
}

.nav-item-link:hover {
  color: var(--text-main);
  background-color: rgba(125, 125, 125, 0.07);
}

/* 推荐资讯特别高亮徽章 */
.nav-item-link.nav-highlight {
  color: var(--text-main);
  font-weight: 600;
  background: var(--hl-yellow);
  color: var(--hl-yellow-text);
  border: 1px solid rgba(133, 77, 14, 0.2);
}

.nav-item-link.nav-highlight:hover {
  filter: brightness(0.96);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 昼夜模式切换按钮（精致透明文具拨动开关） */
.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.theme-toggle-btn:hover {
  border-color: var(--border-notebook-hover);
  background: var(--bg-card-subtle);
  transform: translateY(-1px);
}

.theme-toggle-btn .icon-sun,
.theme-toggle-btn .icon-moon {
  width: 18px;
  height: 18px;
  position: absolute;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

[data-theme="light"] .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="light"] .icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.3);
}

[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.3);
}
[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

/* ==========================================================================
   实体文具贴纸贴标按钮 (Analog Matte Stationery Sticker Buttons)
   带 1px 机械下压段落感 (Tactile Click Down)
   ========================================================================== */
.btn-sticker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.12s ease-in-out;
  min-height: 42px;
  text-decoration: none;
  user-select: none;
}

.btn-sticker-primary {
  background: var(--sticker-btn-bg);
  color: var(--sticker-btn-text) !important;
  border: 1px solid var(--sticker-btn-border);
  box-shadow: var(--sticker-btn-shadow);
}

.btn-sticker-primary:hover {
  filter: brightness(1.05);
}

.btn-sticker-primary:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 transparent;
}

.btn-sticker-subtle {
  background: var(--sticker-subtle-bg);
  color: var(--sticker-subtle-text);
  border: 1px solid var(--sticker-subtle-border);
  box-shadow: var(--sticker-subtle-shadow);
}

.btn-sticker-subtle:hover {
  background: var(--bg-card-subtle);
  border-color: var(--border-notebook-hover);
}

.btn-sticker-subtle:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 transparent;
}

.btn-sticker-lg {
  padding: 13px 28px;
  font-size: 1rem;
  min-height: 48px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 (Hero Section) - 包含品牌名、大标题、副标题、简介与文具工作台
   ========================================================================== */
.hero-stationery-section {
  padding: 70px 0 60px 0;
  background: var(--bg-canvas);
  position: relative;
  border-bottom: 1px solid var(--border-notebook);
}

.hero-workspace-box {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-lg);
  padding: 48px 44px;
  box-shadow: var(--shadow-paper);
  position: relative;
}

/* 顶部装订线修饰 (Notebook Perforation Header) */
.hero-workspace-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--border-notebook) 0,
    var(--border-notebook) 8px,
    transparent 8px,
    transparent 14px
  );
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
}

.hero-title-group {
  margin-bottom: 24px;
}

.hero-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: var(--hl-blue);
  color: var(--hl-blue-text);
  border: 1px solid rgba(3, 105, 161, 0.18);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 20px;
}

/* 大标题必须包含当前品牌名‘肯の机’ */
.hero-headline {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 18px;
}

.hero-headline .brand-highlight {
  display: inline-block;
  background: linear-gradient(120deg, var(--hl-yellow) 0%, var(--hl-yellow) 100%);
  background-repeat: no-repeat;
  background-size: 100% 36%;
  background-position: 0 88%;
}

.hero-subtitle {
  font-size: 1.24rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.55;
  margin-bottom: 16px;
}

/* 主视觉区详细简介 */
.hero-intro-lead {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 900px;
  margin-bottom: 34px;
  border-left: 2px solid var(--border-notebook);
  padding-left: 16px;
}

.hero-cta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

/* 文具工作台四联数据检定章 (Stationery Matrix Counters) */
.hero-spec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 28px;
  border-top: 1px dashed var(--border-perforation);
}

.spec-cell {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: all var(--transition-smooth);
}

.spec-cell:hover {
  background: var(--bg-card);
  border-color: var(--border-notebook-hover);
  transform: translateY(-2px);
}

.spec-cell-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.spec-cell-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.spec-cell-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ==========================================================================
   产品核心优势（3个文具图文卡片）
   悬停触发边缘细密记事本打孔齿线 (Perforation Micro-Interactions)
   ========================================================================== */
.features-trio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stationery-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  position: relative;
  box-shadow: var(--shadow-paper);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

/* 悬停时在卡片顶部展现精细记事本打孔齿线 */
.stationery-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 14px;
  right: 14px;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--border-perforation) 0,
    var(--border-perforation) 4px,
    transparent 4px,
    transparent 8px
  );
  opacity: 0.4;
  transition: opacity var(--transition-smooth);
}

.stationery-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-notebook-hover);
  box-shadow: var(--shadow-paper-hover);
}

.stationery-card:hover::after {
  opacity: 1;
}

.card-stamp-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.stationery-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.stationery-card-body {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.stationery-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-notebook);
}

.checklist-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-body);
}

.check-square {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #16a34a;
  font-weight: 700;
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体 & AI 专项解锁图卡 (Showcase Blocks)
   Notion 模块化画板风格
   ========================================================================== */
.showcase-block-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-stationery-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 34px 30px;
  box-shadow: var(--shadow-paper);
  position: relative;
  transition: all var(--transition-smooth);
}

.showcase-stationery-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-hover);
  border-color: var(--border-notebook-hover);
}

.showcase-top-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.label-streaming {
  background: var(--hl-coral);
  color: var(--hl-coral-text);
  border: 1px solid rgba(185, 28, 28, 0.2);
}

.label-ai {
  background: var(--hl-green);
  color: var(--hl-green-text);
  border: 1px solid rgba(21, 128, 61, 0.2);
}

.showcase-heading {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.showcase-summary {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.tag-matrix-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.stationery-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

.stationery-tag svg {
  width: 14px;
  height: 14px;
}

.spec-table-compact {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  border-top: 1px dashed var(--border-notebook);
  padding-top: 14px;
}

.spec-table-compact td {
  padding: 7px 0;
  border-bottom: 1px solid rgba(125, 125, 125, 0.08);
}

.spec-table-compact td:first-child {
  color: var(--text-muted);
  width: 42%;
  font-family: var(--font-mono);
}

.spec-table-compact td:last-child {
  color: var(--text-main);
  font-weight: 600;
}

/* ==========================================================================
   套餐价格对比表 (参考网上真实机场/专线公认合理价格)
   ========================================================================== */
.pricing-matrix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-sheet-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-paper);
  transition: all var(--transition-smooth);
}

.pricing-sheet-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-hover);
  border-color: var(--border-notebook-hover);
}

/* 推荐热销卡片（类似贴纸置顶） */
.pricing-sheet-card.recommended-tier {
  border: 2px solid var(--text-main);
  background: var(--bg-card);
}

.recommend-sticker-pin {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--hl-yellow);
  color: var(--hl-yellow-text);
  border: 1px solid rgba(133, 77, 14, 0.3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 14px;
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  white-space: nowrap;
}

.tier-code-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.tier-name {
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.tier-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  min-height: 38px;
  margin-bottom: 18px;
}

.tier-price-row {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--border-notebook);
}

.tier-currency {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.tier-price-num {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.tier-cycle {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.tier-features-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 26px;
  flex-grow: 1;
}

.tier-feature-line {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-body);
  line-height: 1.45;
}

.tier-feature-line strong {
  color: var(--text-main);
}

/* ==========================================================================
   区域节点与协议矩阵折叠区 (Regional Network Nodes & Protocols)
   Notion 折叠微动效与复选矩阵
   ========================================================================== */
.nodes-matrix-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.node-accordion-item {
  border-bottom: 1px solid var(--border-notebook);
}

.node-accordion-item:last-child {
  border-bottom: none;
}

.node-accordion-header {
  width: 100%;
  background: none;
  border: none;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  transition: background-color var(--transition-smooth);
}

.node-accordion-header:hover {
  background: var(--bg-card-subtle);
}

.node-region-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  color: var(--text-main);
}

.node-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-latency-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--hl-green);
  color: var(--hl-green-text);
  font-weight: 600;
}

.node-accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 24px;
  background: var(--bg-card-subtle);
  font-size: 0.88rem;
}

.node-accordion-item.active .node-accordion-body {
  max-height: 400px;
  padding: 16px 24px 20px 24px;
  border-top: 1px dashed var(--border-notebook);
}

.accordion-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.node-accordion-item.active .accordion-arrow {
  transform: rotate(180deg);
  color: var(--text-main);
}

/* ==========================================================================
   真实用户评价 (完全摒弃虚假 AI 头像，采用文具印章/真实职业角色)
   ========================================================================== */
.review-stamps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-sheet {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  box-shadow: var(--shadow-paper);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
  position: relative;
}

.review-sheet:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-hover);
  border-color: var(--border-notebook-hover);
}

.review-stamp-date {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.verified-mark {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--hl-green);
  color: var(--hl-green-text);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.review-quote-text {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.68;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author-block {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-notebook);
}

/* 拟物文具字母印章 (Devoid of generic AI avatars) */
.analog-initial-stamp {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.92rem;
  color: var(--text-main);
  flex-shrink: 0;
}

.author-meta-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-meta-title {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-stationery-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-smooth);
}

.faq-card-item:hover {
  border-color: var(--border-notebook-hover);
}

.faq-trigger-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  transition: background-color var(--transition-smooth);
}

.faq-trigger-btn:hover {
  background: var(--bg-card-subtle);
}

.faq-fold-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 24px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.faq-card-item.active .faq-fold-content {
  max-height: 280px;
  padding: 0 24px 20px 24px;
  border-top: 1px dashed var(--border-notebook);
}

.faq-card-item.active .accordion-arrow {
  transform: rotate(180deg);
}

/* 底部突刺贴纸行动条 */
.bottom-stationery-banner {
  margin-top: 48px;
  background: var(--bg-card);
  border: 2px solid var(--text-main);
  border-radius: var(--radius-lg);
  padding: 42px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: var(--shadow-paper-hover);
  flex-wrap: wrap;
}

.banner-copy h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.banner-copy p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   页脚 (Footer) - 严格仅保留四个专属标题链接，打开新页面
   ========================================================================== */
.site-footer {
  background: var(--bg-canvas);
  border-top: 1px solid var(--border-notebook);
  padding: 50px 0 36px 0;
  margin-top: 50px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-smooth), background-color var(--transition-smooth);
}

.footer-nav-link:hover {
  color: var(--text-main);
  background: rgba(125, 125, 125, 0.08);
}

.footer-copyright {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  border-top: 1px dashed var(--border-notebook);
  padding-top: 20px;
  width: 100%;
}

/* ==========================================================================
   资讯/文章页专用排版 (Editorial / Insights Layout)
   ========================================================================== */
.article-container {
  max-width: 820px;
  margin: 48px auto;
  padding: 0 24px;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-notebook);
}

.article-category {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--hl-yellow);
  color: var(--hl-yellow-text);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.article-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 14px;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
}

.article-block {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-paper);
}

.article-block h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  border-left: 3px solid var(--text-main);
  padding-left: 12px;
}

.article-block p {
  color: var(--text-body);
  font-size: 0.96rem;
  line-height: 1.85;
  margin-bottom: 16px;
}

.article-block ul {
  padding-left: 20px;
  margin-bottom: 18px;
}

.article-block ul li {
  list-style: disc;
  margin-bottom: 8px;
  font-size: 0.94rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* 导航面包屑 */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 文具索引目录 (Table of Contents) */
.article-toc-box {
  background: var(--bg-card-subtle);
  border: 1px dashed var(--border-notebook);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 28px;
}

.article-toc-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc-list li {
  list-style: none;
  font-size: 0.88rem;
}

.article-toc-list a {
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-toc-list a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 文章内部内链高亮 */
.inline-site-link {
  color: #2563eb;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.inline-site-link:hover {
  color: #1d4ed8;
}

/* 相关阅读网格 (Related Posts) */
.related-posts-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px dashed var(--border-notebook);
}

.related-posts-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-post-card:hover {
  border-color: var(--border-notebook-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-paper);
}

.related-post-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.related-post-heading {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
}

/* 资讯中心博客列表卡片 (Insights Hub Cards) */
.insights-hub-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.insight-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 32px 30px;
  box-shadow: var(--shadow-paper);
  transition: all var(--transition-smooth);
  position: relative;
}

.insight-card-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-hover);
  border-color: var(--border-notebook-hover);
}

.insight-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.insight-card-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
}

.insight-card-title a:hover {
  text-decoration: underline;
}

.insight-card-summary {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.insight-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px dashed var(--border-notebook);
}

/* ==========================================================================
   子页面专用拟物文具排版 (About, Terms, Privacy, Sitemap)
   ========================================================================== */
.page-hero {
  padding: 56px 0 36px 0;
  background: var(--bg-canvas);
  text-align: center;
  border-bottom: 1px solid var(--border-notebook);
}

.page-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.page-content-wrap {
  max-width: 860px;
  margin: 44px auto;
  padding: 0 24px;
}

.legal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 38px 34px;
  box-shadow: var(--shadow-paper);
  margin-bottom: 28px;
}

.legal-card h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-notebook);
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-card p {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.legal-card ul {
  margin-bottom: 20px;
  padding-left: 20px;
}

.legal-card ul li {
  list-style-type: disc;
  color: var(--text-body);
  margin-bottom: 8px;
  font-size: 0.93rem;
  line-height: 1.68;
}

.legal-card .alert-box {
  background: var(--hl-yellow);
  color: var(--hl-yellow-text);
  border-left: 3px solid #ca8a04;
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
}

.legal-card .alert-box p {
  margin-bottom: 0;
  font-weight: 600;
  color: inherit;
}

/* 网站地图工作台列表 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-group {
  background: var(--bg-card);
  border: 1px solid var(--border-notebook);
  border-radius: var(--radius-md);
  padding: 26px;
  box-shadow: var(--shadow-paper);
}

.sitemap-group h3 {
  font-size: 1.1rem;
  color: var(--text-main);
  margin-bottom: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-group ul li {
  margin-bottom: 10px;
}

.sitemap-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-notebook);
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.88rem;
}

.sitemap-link:hover {
  border-color: var(--border-notebook-hover);
  background: var(--bg-card);
  transform: translateX(3px);
}

/* ==========================================================================
   移动端响应式 (@media) 保证单栏与触控灵敏度
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .review-stamps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 50px 0;
  }

  .header-container {
    height: 60px;
  }

  /* 移动端保留关键导航水平滚动条，不遮挡操作 */
  .nav-catalog {
    display: none;
  }

  .hero-workspace-box {
    padding: 28px 20px;
  }

  .hero-headline {
    font-size: 1.95rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .hero-intro-lead {
    font-size: 0.92rem;
  }

  .hero-spec-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-trio-grid {
    grid-template-columns: 1fr;
  }

  .showcase-block-grid {
    grid-template-columns: 1fr;
  }

  .pricing-matrix-grid {
    grid-template-columns: 1fr;
  }

  .review-stamps-grid {
    grid-template-columns: 1fr;
  }

  .bottom-stationery-banner {
    flex-direction: column;
    text-align: center;
    padding: 28px 20px;
  }

  .btn-sticker {
    width: 100%;
    min-height: 48px; /* 适合手指点击的高灵敏度触控区 */
  }

  .hero-cta-bar {
    flex-direction: column;
    width: 100%;
  }

  .header-actions .btn-sticker {
    width: auto;
    padding: 6px 14px;
    font-size: 0.85rem;
    min-height: 38px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }
}