/* ==========================================================================
   base · 基础变量与全局重置
   ========================================================================== */

:root {
  --color-ink: #232a33;
  --color-steel: #45505b;
  --color-line: #c2c9d0;
  --color-bg: #f5f6f8;
  --color-accent: #2f6f8f;
  --color-accent-dark: #255a73;
  --color-warn: #b4552d;
  --color-white: #ffffff;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-steel);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-accent-dark);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

h1,
h2,
h3 {
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 600;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   layout · 全站骨架容器
   ========================================================================== */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 0 auto;
}

.site-inner {
  width: 100%;
}

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

/* ==========================================================================
   components · 页头与导航
   ========================================================================== */

.site-header {
  background-color: var(--color-ink);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand-block {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  color: var(--color-white);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-tagline {
  color: rgba(255, 255, 255, 0.6);
  font-size: 12px;
  letter-spacing: 0.01em;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 10px 14px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.is-current {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.14);
}

.nav-item.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-toggle:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.dropdown-toggle::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-top: -3px;
  transition: transform var(--transition-fast);
}

.dropdown-toggle[aria-expanded="true"]::after {
  transform: rotate(225deg);
  margin-top: 3px;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 160px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(35, 42, 51, 0.12);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 50;
}

.nav-item.dropdown:hover .dropdown-menu,
.nav-item.dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.dropdown-menu li + li {
  margin-top: 2px;
}

.dropdown-link {
  display: block;
  padding: 8px 12px;
  color: var(--color-steel);
  font-size: 14px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-link:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.header-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   components · 按钮
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(47, 111, 143, 0.06);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

/* ==========================================================================
   components · 面包屑与页标题
   ========================================================================== */

.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 14px;
  color: var(--color-steel);
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: var(--color-accent);
}

.breadcrumb a:hover {
  color: var(--color-accent-dark);
}

.breadcrumb-sep {
  color: var(--color-line);
}

.breadcrumb-current {
  color: var(--color-steel);
}

.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 8px;
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
}

.page-title-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 12px 24px 32px;
}

.page-lead,
.page-intro,
.page-title-desc {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-steel);
  max-width: 780px;
}

/* ==========================================================================
   components · 区块标题
   ========================================================================== */

.section-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.35;
}

.section-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-steel);
  margin-top: 8px;
}

.section-header {
  margin-bottom: 32px;
}

.section-index {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

/* ==========================================================================
   components · 页脚
   ========================================================================== */

.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.72);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-brand-name {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col-title {
  color: var(--color-white);
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 14px;
}

.footer-link-list li + li {
  margin-top: 8px;
}

.footer-link {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  line-height: 1.6;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-compliance-text {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 24px;
  text-align: center;
}

.copyright-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
}

/* ==========================================================================
   components · 首页 hero
   ========================================================================== */

.hero-block {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.hero-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px 56px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 36px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-white);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 28px;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-cta-group .btn-primary {
  background-color: var(--color-accent);
}

.hero-cta-group .btn-primary:hover {
  background-color: var(--color-accent-dark);
}

.hero-cta-group .btn-secondary {
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--color-white);
}

.hero-cta-group .btn-secondary:hover {
  border-color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.boundary-notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  background-color: rgba(180, 85, 45, 0.16);
  border-left: 3px solid var(--color-warn);
  border-radius: var(--radius-sm);
}

.notice-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border-radius: 50%;
  background-color: var(--color-warn);
  position: relative;
}

.notice-icon::before {
  content: "!";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 12px;
  font-weight: 600;
}

.notice-text {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}

.hero-media {
  margin: 0;
}

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.content-media {
  margin: 0;
}

.content-media-primary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.content-media-primary img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.content-media-primary figcaption,
.content-media figcaption {
  padding: 12px 4px 0;
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

/* ==========================================================================
   components · 首页服务参数表
   ========================================================================== */

.service-parameter-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 16px;
}

.service-parameter-table {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  overflow: hidden;
}

.service-param-row {
  display: grid;
  grid-template-columns: 72px 1.4fr 1fr 1fr;
  gap: 24px;
  padding: 24px 28px;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
}

.service-param-row:last-child {
  border-bottom: none;
}

.param-index {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.param-content {
  min-width: 0;
}

.param-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.param-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.param-deliverable,
.param-cycle {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.param-label {
  font-size: 12px;
  color: var(--color-steel);
  font-weight: 500;
}

.param-value {
  font-size: 14px;
  color: var(--color-ink);
  font-weight: 500;
}

/* ==========================================================================
   components · 首页工作流管线
   ========================================================================== */

.workflow-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.workflow-pipeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.pipeline-stage {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.pipeline-stage:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(47, 111, 143, 0.1);
}

.stage-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}

.stage-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.stage-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-steel);
}

/* ==========================================================================
   components · 首页四象限模型
   ========================================================================== */

.model-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.model-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: stretch;
}

.quadrant-visual {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quadrant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 12px;
  width: 100%;
  max-width: 380px;
}

.quadrant-cell {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  background-color: var(--color-bg);
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.quadrant-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.quadrant-note {
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

.quadrant-axis-x {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
}

.axis-label {
  font-size: 12px;
  color: var(--color-steel);
}

.quadrant-axis-y {
  position: absolute;
  top: 50%;
  left: 12px;
  transform: translateY(-50%) rotate(-90deg);
  transform-origin: center;
}

.dimension-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.dimension-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color var(--transition-fast);
}

.dimension-panel:hover {
  border-color: var(--color-accent);
}

.dimension-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.dimension-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.dimension-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-steel);
}

.model-cta {
  grid-column: 1 / -1;
  margin-top: 24px;
  text-align: center;
}

/* ==========================================================================
   components · 首页场景预览
   ========================================================================== */

.scenario-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.scenario-preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.scenario-preview-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.scenario-preview-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(47, 111, 143, 0.08);
}

.scenario-phase {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.scenario-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.scenario-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  margin-bottom: 16px;
}

.scenario-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.text-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  position: relative;
}

.text-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.text-link:hover::after {
  width: 100%;
}

/* ==========================================================================
   components · 首页服务说明摘要
   ========================================================================== */

.statement-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.statement-preview-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.statement-preview-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
  transition: border-color var(--transition-fast);
}

.statement-preview-item:hover {
  border-color: var(--color-accent);
}

.statement-num {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: rgba(47, 111, 143, 0.1);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.statement-preview-content {
  min-width: 0;
}

.statement-preview-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.statement-preview-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

/* ==========================================================================
   components · 首页合作流程预览
   ========================================================================== */

.process-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.process-preview-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.preview-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
}

.step-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}

.step-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-steel);
}

.process-preview-cta {
  margin-top: 24px;
  text-align: center;
}

/* ==========================================================================
   components · 首页 FAQ 预览
   ========================================================================== */

.faq-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 16px;
}

.faq-preview-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 860px;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--transition-fast);
}

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

.faq-question::after {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-steel);
  border-bottom: 2px solid var(--color-steel);
  transform: rotate(45deg);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(225deg);
}

.faq-question:hover {
  background-color: var(--color-bg);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.faq-preview-cta {
  margin-top: 24px;
  text-align: center;
}

/* ==========================================================================
   pages · 服务范围 services.html
   ========================================================================== */

.page-services .service-parameter-section {
  padding-top: 24px;
}

.service-parameter-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.service-parameter-row {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: grid;
  grid-template-columns: 64px 1.3fr 1fr 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.service-param-index {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.service-param-content {
  min-width: 0;
}

.service-param-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.service-param-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.service-param-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.service-param-label {
  font-size: 12px;
  color: var(--color-steel);
  font-weight: 500;
}

.service-param-value {
  font-size: 14px;
  color: var(--color-ink);
  font-weight: 500;
}

.service-image-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 16px;
}

.service-figure {
  margin: 0;
}

.service-image {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.service-figure-caption {
  padding: 12px 4px 0;
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

.boundary-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 16px;
}

.boundary-table {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.boundary-table thead th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  padding: 14px 20px;
  text-align: left;
}

.boundary-table tbody td {
  padding: 14px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  border-top: 1px solid var(--color-line);
}

.boundary-table tbody tr:nth-child(even) td {
  background-color: var(--color-bg);
}

.related-links-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 16px;
}

.related-link-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-link-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-base);
}

.related-link-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(47, 111, 143, 0.08);
}

.related-link-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.related-link-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-steel);
}

/* ==========================================================================
   pages · 选题方法 method.html
   ========================================================================== */

.page-method .container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.article-intro {
  margin-bottom: 40px;
}

.article-lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: 16px;
  font-weight: 500;
}

.article-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-steel);
}

.model-quadrant-explainer {
  margin-bottom: 48px;
}

.dimension-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.dimension-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-fast);
}

.dimension-card:hover {
  border-color: var(--color-accent);
}

.dimension-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.dimension-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  background-color: rgba(47, 111, 143, 0.1);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
}

.dimension-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.dimension-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
  margin-bottom: 10px;
}

.dimension-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-accent);
  border-left: 2px solid var(--color-accent);
  padding-left: 12px;
}

.eval-steps {
  margin-bottom: 48px;
}

.step-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.step-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.step-number {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.step-content {
  min-width: 0;
}

.step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.step-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
}

.example-walkthrough {
  margin-bottom: 48px;
}

.example-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.example-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.example-card.example-good {
  border-top: 3px solid var(--color-accent);
}

.example-card.example-bad {
  border-top: 3px solid var(--color-warn);
}

.example-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.example-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.example-good .example-tag {
  background-color: rgba(47, 111, 143, 0.1);
  color: var(--color-accent);
}

.example-bad .example-tag {
  background-color: rgba(180, 85, 45, 0.1);
  color: var(--color-warn);
}

.example-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.example-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
  margin-bottom: 12px;
}

.example-result {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink);
  font-weight: 500;
}

.method-figure {
  margin: 24px 0 0;
}

.method-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.figure-caption {
  padding: 12px 4px 0;
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

.method-notes {
  margin-bottom: 48px;
}

.notes-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 20px;
}

.note-item {
  display: flex;
  gap: 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 14px 20px;
}

.note-label {
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.note-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.related-links {
  margin-bottom: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-accent);
}

.related-card-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.related-card-desc {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-steel);
}

/* ==========================================================================
   pages · 应用场景 scenarios.html
   ========================================================================== */

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 16px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.layout-shell.sidebar-left {
  grid-template-columns: 240px 1fr;
}

.scenario-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: 88px;
}

.index-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.index-link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-steel);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.index-link:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.index-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-steel);
}

.scenario-content {
  min-width: 0;
}

.scenario-figure {
  margin: 0 0 24px;
}

.scenario-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.scenario-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  scroll-margin-top: 88px;
}

.scenario-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.scenario-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  background-color: rgba(47, 111, 143, 0.1);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.scenario-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
}

.scenario-detail {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
}

.detail-term {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
}

.detail-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.related-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.related-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.related-desc {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-steel);
}

.inline-link {
  color: var(--color-accent);
  font-weight: 500;
}

.inline-link:hover {
  color: var(--color-accent-dark);
}

/* ==========================================================================
   pages · 内容日历 calendar.html
   ========================================================================== */

.calendar-field-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.field-table-wrap {
  margin-top: 20px;
  overflow-x: auto;
}

.field-table {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  min-width: 640px;
}

.field-table thead th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  padding: 14px 20px;
  text-align: left;
}

.field-table tbody th {
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-top: 1px solid var(--color-line);
  background-color: var(--color-bg);
  text-align: left;
}

.field-table tbody td {
  padding: 14px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  border-top: 1px solid var(--color-line);
}

.rhythm-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.rhythm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.rhythm-col {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.rhythm-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
  margin-top: 12px;
}

.image-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.content-figure {
  margin: 0;
}

.content-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ==========================================================================
   pages · 合作方式 process.html
   ========================================================================== */

.section-block {
  margin-bottom: 40px;
}

.step-timeline {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.timeline-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 24px;
  position: relative;
}

.timeline-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.timeline-index {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.timeline-content {
  min-width: 0;
  flex: 1;
}

.timeline-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.timeline-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  margin-bottom: 16px;
}

.duty-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.duty-ours,
.duty-client {
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-steel);
}

.duty-ours {
  border-left: 2px solid var(--color-accent);
}

.duty-client {
  border-left: 2px solid var(--color-line);
}

.duty-table-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.table-scroll {
  overflow-x: auto;
  margin-top: 20px;
}

.duty-table {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  min-width: 640px;
}

.duty-table thead th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  padding: 14px 20px;
  text-align: left;
}

.duty-table tbody th {
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-top: 1px solid var(--color-line);
  background-color: var(--color-bg);
  text-align: left;
  white-space: nowrap;
}

.duty-table tbody td {
  padding: 14px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  border-top: 1px solid var(--color-line);
}

.related-link-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-link-list a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.related-link-list a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   pages · 服务说明 statement.html
   ========================================================================== */

.principle-entries {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.principle-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  gap: 20px;
  margin-bottom: 16px;
}

.principle-index {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: rgba(47, 111, 143, 0.1);
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.principle-body {
  min-width: 0;
  flex: 1;
}

.principle-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.principle-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  margin-bottom: 12px;
}

.principle-detail {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
  padding: 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.principle-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--color-steel);
}

.meta-label {
  font-weight: 500;
  color: var(--color-ink);
}

.meta-value {
  margin-right: 8px;
}

.meta-link {
  font-size: 13px;
  font-weight: 500;
}

.boundary-statement {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.boundary-inner {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
}

.boundary-text {
  min-width: 0;
}

.boundary-text p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-steel);
  margin-bottom: 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.boundary-list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
  padding-left: 20px;
  position: relative;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-warn);
}

.boundary-figure {
  margin: 0;
}

.boundary-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.boundary-figure figcaption {
  padding: 10px 4px 0;
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-link {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.related-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   pages · 常见问题 faq.html
   ========================================================================== */

.page-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.tag-filter-module {
  margin-bottom: 32px;
}

.tag-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.tag-filter-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  margin-right: 4px;
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-steel);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: 20px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.filter-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-tag.is-active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

.tag-filter-hint {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-steel);
}

.faq-groups {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.faq-group-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
}

.faq-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-answer p {
  margin-bottom: 8px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-image-block {
  margin: 40px 0 0;
}

.faq-image {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.faq-image-caption {
  padding: 12px 4px 0;
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
}

.related-links-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.related-links-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-links-list a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.related-links-list a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 72px - 320px);
  padding: 48px 24px;
}

.error-panel {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-size: 72px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.error-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-steel);
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.error-help {
  font-size: 14px;
  color: var(--color-steel);
}

.error-link {
  font-weight: 500;
}

/* ==========================================================================
   responsive · 响应式断点
   ========================================================================== */

@media (max-width: 1024px) {
  .header-inner {
    padding: 0 20px;
  }

  .main-nav {
    order: 3;
    width: 100%;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    padding: 12px 20px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  }

  .nav-list.is-open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
    position: relative;
  }

  .header-cta {
    margin-left: auto;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link,
  .dropdown-toggle {
    display: block;
    width: 100%;
    padding: 12px 8px;
    border-radius: var(--radius-sm);
  }

  .dropdown-menu {
    position: static;
    transform: none;
    box-shadow: none;
    background-color: rgba(255, 255, 255, 0.06);
    border: none;
    border-radius: var(--radius-sm);
    opacity: 1;
    visibility: visible;
    padding: 4px 8px;
    margin-top: 4px;
    display: none;
  }

  .nav-item.dropdown:hover .dropdown-menu,
  .nav-item.dropdown:focus-within .dropdown-menu {
    display: block;
  }

  .dropdown-link {
    color: rgba(255, 255, 255, 0.8);
  }

  .dropdown-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 20px 40px;
  }

  .hero-title {
    font-size: 30px;
  }

  .service-param-row {
    grid-template-columns: 56px 1fr 1fr 1fr;
    gap: 16px;
    padding: 20px;
  }

  .workflow-pipeline {
    grid-template-columns: repeat(3, 1fr);
  }

  .model-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-parameter-row {
    grid-template-columns: 56px 1fr 1fr 1fr;
    gap: 16px;
    padding: 20px;
  }

  .layout-shell,
  .layout-shell.sidebar-left {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }

  .related-link-grid,
  .related-grid,
  .related-list,
  .related-links-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .breadcrumb,
  .page-header,
  .page-title-block {
    padding-left: 20px;
    padding-right: 20px;
  }

  .page-title {
    font-size: 26px;
  }

  .service-param-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }

  .param-index {
    font-size: 16px;
  }

  .param-deliverable,
  .param-cycle {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
  }

  .workflow-pipeline {
    grid-template-columns: 1fr 1fr;
  }

  .dimension-panels {
    grid-template-columns: 1fr;
  }

  .scenario-preview-grid,
  .statement-preview-list {
    grid-template-columns: 1fr;
  }

  .process-preview-steps {
    grid-template-columns: 1fr 1fr;
  }

  .service-parameter-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }

  .service-param-index {
    font-size: 16px;
  }

  .service-param-meta {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
  }

  .dimension-grid {
    grid-template-columns: 1fr;
  }

  .example-pair {
    grid-template-columns: 1fr;
  }

  .layout-shell,
  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
    padding-left: 20px;
    padding-right: 20px;
  }

  .scenario-index {
    position: static;
    order: 2;
    margin-top: 24px;
  }

  .scenario-content {
    order: 1;
  }

  .rhythm-grid {
    grid-template-columns: 1fr;
  }

  .duty-split {
    grid-template-columns: 1fr;
  }

  .boundary-inner {
    grid-template-columns: 1fr;
  }

  .related-links-grid,
  .related-link-list,
  .related-links-list {
    grid-template-columns: 1fr;
  }

  .related-link-grid,
  .related-grid,
  .related-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 20px 24px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 16px;
    min-height: 64px;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-tagline {
    font-size: 11px;
  }

  .header-cta .btn-sm {
    padding: 8px 12px;
    font-size: 13px;
  }

  .nav-list {
    top: 64px;
    padding: 12px 16px 16px;
  }

  .hero-inner {
    padding: 40px 16px 32px;
  }

  .hero-title {
    font-size: 26px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .hero-media img {
    height: 220px;
  }

  .content-media-primary {
    padding: 0 16px 24px;
  }

  .content-media-primary img {
    height: 200px;
  }

  .service-parameter-section,
  .workflow-section,
  .model-section,
  .scenario-preview-section,
  .statement-preview-section,
  .process-preview-section,
  .faq-preview-section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .workflow-pipeline {
    grid-template-columns: 1fr;
  }

  .process-preview-steps {
    grid-template-columns: 1fr;
  }

  .quadrant-grid {
    grid-template-columns: 1fr;
  }

  .quadrant-cell {
    min-height: auto;
  }

  .quadrant-visual {
    min-height: auto;
    padding: 20px;
  }

  .quadrant-axis-x,
  .quadrant-axis-y {
    display: none;
  }

  .breadcrumb,
  .page-header,
  .page-title-block {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-lead,
  .page-intro,
  .page-title-desc {
    font-size: 15px;
  }

  .service-parameter-list,
  .service-parameter-row {
    padding-left: 16px;
    padding-right: 16px;
  }

  .service-parameter-row {
    padding: 20px 16px;
  }

  .service-parameter-section,
  .service-image-section,
  .boundary-section,
  .related-links-section,
  .calendar-field-section,
  .rhythm-section,
  .image-block,
  .step-timeline,
  .duty-table-block,
  .principle-entries,
  .boundary-statement,
  .page-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .service-image,
  .method-image,
  .scenario-image,
  .content-image,
  .faq-image {
    height: 200px;
  }

  .related-link-grid,
  .related-grid,
  .related-list,
  .related-links-list {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .timeline-index {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .principle-card {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .boundary-inner {
    padding: 20px;
  }

  .error-code {
    font-size: 56px;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }
}