/**
 * 良心云机场 · 方案 C：极光方舟 (LXY-ARK-C01)
 * 独立核心样式系统 ark-core.css
 */

:root {
  /* 配色系统 */
  --ark-bg-primary: #080A16;
  --ark-bg-secondary: #101629;
  --ark-bg-card: rgba(16, 22, 41, 0.7);
  --ark-bg-glass: rgba(22, 30, 56, 0.55);
  --ark-text-primary: #F6F7FF;
  --ark-text-secondary: #A8B0CB;
  --ark-text-muted: #79829E;
  
  --ark-purple: #9A7CFF;
  --ark-cyan: #74E6E7;
  --ark-silver: #DCE6FF;
  
  --ark-border-subtle: rgba(220, 230, 255, 0.14);
  --ark-border-hover: rgba(116, 230, 231, 0.35);
  --ark-border-focus: #74E6E7;

  /* 渐变与阴影 */
  --ark-grad-aurora: linear-gradient(135deg, #9A7CFF 0%, #74E6E7 100%);
  --ark-grad-glow: radial-gradient(circle at 50% 0%, rgba(154, 124, 255, 0.18) 0%, rgba(116, 230, 231, 0.08) 45%, transparent 70%);
  --ark-glow-purple: 0 0 32px rgba(154, 124, 255, 0.22);
  --ark-glow-cyan: 0 0 32px rgba(116, 230, 231, 0.25);

  /* 容器与空间 */
  --ark-max-width: 1280px;
  --ark-wide-width: 1440px;
  --ark-section-space: clamp(80px, 12vw, 160px);

  /* 排版尺寸 */
  --ark-font-hero: clamp(48px, 7.5vw, 108px);
  --ark-font-h2: clamp(32px, 4.5vw, 56px);
  --ark-font-h3: clamp(22px, 2.8vw, 32px);
  --ark-font-lead: clamp(16px, 1.8vw, 20px);
  --ark-font-body: 16px;
  --ark-font-sm: 14px;
}

/* 基础重置 */
*, *::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;
  background-color: var(--ark-bg-primary);
  color: var(--ark-text-primary);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--ark-bg-primary);
  color: var(--ark-text-primary);
  line-height: 1.65;
  font-size: var(--ark-font-body);
  overflow-x: hidden;
  min-height: 100vh;
}

/* 选区与无障碍跳转 */
::selection {
  background: var(--ark-purple);
  color: #FFFFFF;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 24px;
  padding: 12px 20px;
  background: var(--ark-cyan);
  color: #080A16;
  font-weight: 700;
  border-radius: 4px;
  z-index: 9999;
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 20px;
  outline: 3px solid var(--ark-purple);
}

:focus-visible {
  outline: 2px solid var(--ark-border-focus);
  outline-offset: 4px;
}

/* 布局外框 */
.ark-container {
  width: 100%;
  max-width: var(--ark-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

/* 导航系统 (Minimalist Floating Nav) */
.ark-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: background-color 0.3s ease, padding 0.3s ease, border-color 0.3s ease;
}

.ark-header.scrolled {
  padding: 14px 0;
  background: rgba(8, 10, 22, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--ark-border-subtle);
}

.ark-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ark-brand-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}
.ark-brand-logo img,
.ark-brand-logo svg {
  height: 38px;
  width: auto;
  display: block;
}

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

.ark-nav-link {
  color: var(--ark-text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: color 0.2s ease;
  position: relative;
  padding: 8px 0;
}

.ark-nav-link:hover,
.ark-nav-link.active {
  color: var(--ark-text-primary);
}

.ark-nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--ark-grad-aurora);
  transition: width 0.25s ease;
}
.ark-nav-link:hover::after,
.ark-nav-link.active::after {
  width: 100%;
}

.ark-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.8px;
  color: #080A16;
  background: var(--ark-grad-aurora);
  border-radius: 999px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(116, 230, 231, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.ark-nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(154, 124, 255, 0.4);
}

/* 移动端汉堡按钮 */
.ark-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--ark-border-subtle);
  border-radius: 8px;
  width: 44px;
  height: 44px;
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-around;
}
.ark-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ark-text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* 通用按钮 */
.ark-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 32px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}

.ark-btn-primary {
  background: var(--ark-grad-aurora);
  color: #080A16;
  box-shadow: 0 8px 30px rgba(116, 230, 231, 0.25);
}
.ark-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(154, 124, 255, 0.45);
}

.ark-btn-secondary {
  background: var(--ark-bg-glass);
  color: var(--ark-silver);
  border-color: var(--ark-border-subtle);
  backdrop-filter: blur(10px);
}
.ark-btn-secondary:hover {
  border-color: var(--ark-cyan);
  color: #FFFFFF;
  background: rgba(30, 42, 75, 0.6);
  transform: translateY(-2px);
}

/* ================= 01｜极简品牌发布式首屏 ================= */
.ark-hero-section {
  position: relative;
  padding-top: clamp(140px, 18vh, 220px);
  padding-bottom: clamp(60px, 8vh, 120px);
  background: radial-gradient(circle at 50% 20%, rgba(154, 124, 255, 0.12) 0%, rgba(8, 10, 22, 0) 70%);
  text-align: center;
  overflow: hidden;
}

.ark-hero-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(116, 230, 231, 0.08);
  border: 1px solid rgba(116, 230, 231, 0.25);
  font-size: 13px;
  color: var(--ark-cyan);
  letter-spacing: 1.5px;
  margin-bottom: 32px;
}
.ark-hero-meta .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ark-cyan);
  box-shadow: 0 0 8px var(--ark-cyan);
}

.ark-hero-title {
  font-size: var(--ark-font-hero);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ark-text-primary);
  margin-bottom: 24px;
}

.ark-hero-title .gradient-text {
  background: var(--ark-grad-aurora);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.ark-hero-subtitle {
  max-width: 680px;
  margin: 0 auto 40px auto;
  font-size: var(--ark-font-lead);
  color: var(--ark-text-secondary);
  line-height: 1.7;
}

.ark-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: clamp(48px, 6vw, 80px);
}

.ark-sculpture-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}
.ark-sculpture-wrapper img,
.ark-sculpture-wrapper svg {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 20px 60px rgba(116, 230, 231, 0.15));
}

/* ================= 02｜全屏产品宣言 ================= */
.ark-manifesto-section {
  padding: var(--ark-section-space) 0;
  background: linear-gradient(180deg, var(--ark-bg-primary) 0%, var(--ark-bg-secondary) 50%, var(--ark-bg-primary) 100%);
  position: relative;
}

.ark-manifesto-container {
  max-width: 960px;
  margin: 0 auto;
}

.ark-manifesto-label {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--ark-purple);
  margin-bottom: 32px;
  display: block;
}

.ark-manifesto-lead {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ark-text-primary);
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.ark-manifesto-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
  border-top: 1px solid var(--ark-border-subtle);
  padding-top: 48px;
}

.ark-manifesto-item h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ark-silver);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.ark-manifesto-item h3 .index {
  color: var(--ark-cyan);
  font-size: 14px;
  font-family: monospace;
}

.ark-manifesto-item p {
  color: var(--ark-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ================= 03｜沉浸式设备展示 ================= */
.ark-device-section {
  padding: var(--ark-section-space) 0;
  position: relative;
  overflow: hidden;
}

.ark-section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto clamp(40px, 6vw, 64px) auto;
}

.ark-section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--ark-cyan);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  margin-bottom: 16px;
}

.ark-section-title {
  font-size: var(--ark-font-h2);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ark-text-primary);
  margin-bottom: 18px;
}

.ark-section-desc {
  font-size: var(--ark-font-lead);
  color: var(--ark-text-secondary);
  line-height: 1.65;
}

.ark-device-display {
  max-width: 1020px;
  margin: 0 auto 48px auto;
  position: relative;
}
.ark-device-display img,
.ark-device-display svg {
  width: 100%;
  height: auto;
  display: block;
}

.ark-device-notes {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 32px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.ark-note-text {
  font-size: 14px;
  color: var(--ark-text-secondary);
}
.ark-note-text strong {
  color: var(--ark-text-primary);
}

/* ================= 04｜横向使用场景画廊 ================= */
.ark-gallery-section {
  padding: var(--ark-section-space) 0;
  background: var(--ark-bg-secondary);
  position: relative;
}

.ark-gallery-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 40px;
}

.ark-gallery-controls {
  display: flex;
  gap: 12px;
}

.ark-gallery-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ark-bg-glass);
  border: 1px solid var(--ark-border-subtle);
  color: var(--ark-silver);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}
.ark-gallery-btn:hover {
  border-color: var(--ark-cyan);
  color: #FFFFFF;
  background: rgba(116, 230, 231, 0.15);
}

.ark-gallery-track-outer {
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 10px 0 24px 0;
}
.ark-gallery-track-outer::-webkit-scrollbar {
  display: none;
}

.ark-gallery-track {
  display: flex;
  gap: 28px;
  width: max-content;
}

.ark-scenario-card {
  width: 380px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 20px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.ark-scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--ark-border-hover);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.ark-card-visual {
  width: 100%;
  height: 200px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 20px;
  background: #090C1A;
}
.ark-card-visual img,
.ark-card-visual svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.ark-card-tag {
  font-size: 12px;
  color: var(--ark-purple);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.ark-card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 12px;
}

.ark-card-desc {
  font-size: 14px;
  color: var(--ark-text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

.ark-card-specs {
  border-top: 1px solid var(--ark-border-subtle);
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--ark-text-muted);
}
.ark-card-specs strong {
  color: var(--ark-cyan);
}

/* ================= 05｜错位式核心优势 ================= */
.ark-asymmetric-section {
  padding: var(--ark-section-space) 0;
  position: relative;
}

.ark-editorial-layout {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.ark-block-01 {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  padding: 48px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 24px;
  align-items: center;
}
.ark-num-hero {
  font-size: clamp(64px, 8vw, 110px);
  font-weight: 900;
  font-family: monospace;
  background: var(--ark-grad-aurora);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}
.ark-block-01-content h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 14px;
}
.ark-block-01-content p {
  color: var(--ark-text-secondary);
  font-size: 16px;
  line-height: 1.7;
}

.ark-block-02 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 48px;
  background: radial-gradient(circle at 10% 50%, rgba(154, 124, 255, 0.15) 0%, rgba(16, 22, 41, 0.8) 70%);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 24px;
}
.ark-block-02-quote {
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ark-silver);
  letter-spacing: -0.01em;
}
.ark-block-02-quote span {
  color: var(--ark-cyan);
}
.ark-block-02-text p {
  color: var(--ark-text-secondary);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 16px;
}

.ark-block-03 {
  padding: 48px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 24px;
}
.ark-block-03-header {
  font-size: 24px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 24px;
}
.ark-block-03-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.ark-block-03-item h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ark-cyan);
  margin-bottom: 10px;
}
.ark-block-03-item p {
  font-size: 14px;
  color: var(--ark-text-secondary);
  line-height: 1.65;
}

/* ================= 06｜旗舰式套餐选择 ================= */
.ark-pricing-section {
  padding: var(--ark-section-space) 0;
  background: linear-gradient(180deg, var(--ark-bg-primary) 0%, var(--ark-bg-secondary) 100%);
  position: relative;
}

.ark-tier-selector-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.ark-tier-tab {
  min-height: 44px;
  padding: 0 24px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  color: var(--ark-text-secondary);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.ark-tier-tab:hover {
  color: var(--ark-text-primary);
  border-color: rgba(116, 230, 231, 0.3);
}
.ark-tier-tab.active {
  background: var(--ark-grad-aurora);
  color: #080A16;
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(116, 230, 231, 0.3);
}

.ark-focused-card-container {
  max-width: 760px;
  margin: 0 auto;
}

.ark-focused-card {
  background: rgba(18, 24, 46, 0.85);
  border: 1px solid rgba(116, 230, 231, 0.3);
  border-radius: 28px;
  padding: clamp(32px, 5vw, 56px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  position: relative;
  transition: all 0.3s ease;
}

.ark-tier-badge {
  position: absolute;
  top: 32px;
  right: 36px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  background: rgba(154, 124, 255, 0.15);
  border: 1px solid rgba(154, 124, 255, 0.4);
  color: var(--ark-purple);
}

.ark-tier-name {
  font-size: 32px;
  font-weight: 800;
  color: var(--ark-text-primary);
  margin-bottom: 8px;
}

.ark-tier-period {
  font-size: 14px;
  color: var(--ark-text-secondary);
  margin-bottom: 24px;
}

.ark-price-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--ark-border-subtle);
}

.ark-price-currency {
  font-size: 28px;
  font-weight: 700;
  color: var(--ark-cyan);
}

.ark-price-num {
  font-size: clamp(48px, 6vw, 68px);
  font-weight: 900;
  line-height: 1;
  color: var(--ark-text-primary);
  letter-spacing: -0.02em;
}

.ark-price-unit {
  font-size: 16px;
  color: var(--ark-text-secondary);
}

.ark-tier-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.ark-spec-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ark-spec-label {
  font-size: 12px;
  color: var(--ark-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.ark-spec-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--ark-silver);
}

.ark-tier-features {
  list-style: none;
  margin-bottom: 36px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ark-tier-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--ark-text-secondary);
}
.ark-tier-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--ark-cyan);
  flex-shrink: 0;
}

.ark-tier-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ark-tier-btn {
  width: 100%;
  min-height: 52px;
  font-size: 16px;
}

.ark-tier-tip {
  font-size: 12px;
  color: var(--ark-text-muted);
  text-align: center;
}

/* ================= 07｜极简使用流程 ================= */
.ark-workflow-section {
  padding: var(--ark-section-space) 0;
  position: relative;
}

.ark-workflow-staggered {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.ark-step-card {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 32px;
  padding: 36px;
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 20px;
  align-items: center;
}
.ark-step-card:nth-child(even) {
  margin-left: clamp(20px, 4vw, 60px);
  border-color: rgba(116, 230, 231, 0.25);
}

.ark-step-num {
  font-size: 48px;
  font-weight: 900;
  font-family: monospace;
  color: var(--ark-purple);
  line-height: 1;
}

.ark-step-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 8px;
}
.ark-step-content p {
  font-size: 14.5px;
  color: var(--ark-text-secondary);
  line-height: 1.65;
}

/* ================= 08｜品牌信任与用户评价视点 ================= */
.ark-trust-section {
  padding: var(--ark-section-space) 0;
  background: var(--ark-bg-secondary);
  position: relative;
}

.ark-reviews-filter-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.ark-filter-btn {
  min-height: 38px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ark-text-secondary);
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  cursor: pointer;
  transition: all 0.2s ease;
}
.ark-filter-btn:hover {
  color: var(--ark-text-primary);
  border-color: rgba(116, 230, 231, 0.4);
}
.ark-filter-btn.active {
  color: #080A16;
  background: var(--ark-grad-aurora);
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(116, 230, 231, 0.25);
}

.ark-reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.ark-review-card {
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 20px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
}
.ark-review-card:hover {
  transform: translateY(-4px);
  border-color: var(--ark-border-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.ark-review-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.ark-review-category {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ark-purple);
}
.ark-review-badge {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(116, 230, 231, 0.1);
  border: 1px solid rgba(116, 230, 231, 0.3);
  color: var(--ark-cyan);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.ark-review-badge::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ark-cyan);
}

.ark-review-quote {
  font-size: 15px;
  color: var(--ark-text-primary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.ark-review-metrics-tag {
  display: inline-block;
  background: rgba(22, 30, 56, 0.6);
  border: 1px solid rgba(220, 230, 255, 0.1);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--ark-silver);
  margin-bottom: 18px;
}
.ark-review-metrics-tag strong {
  color: var(--ark-cyan);
}

.ark-review-author {
  border-top: 1px solid var(--ark-border-subtle);
  padding-top: 16px;
}
.ark-author-role {
  font-size: 14px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 4px;
}
.ark-author-scenario {
  font-size: 12px;
  color: var(--ark-text-muted);
}

/* 提交评价互动栏 */
.ark-feedback-banner {
  background: var(--ark-bg-card);
  border: 1px dashed rgba(116, 230, 231, 0.3);
  border-radius: 16px;
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.ark-feedback-text h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 4px;
}
.ark-feedback-text p {
  font-size: 13.5px;
  color: var(--ark-text-secondary);
  margin-bottom: 0;
}

.ark-transparency-board {
  background: var(--ark-bg-primary);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 20px;
  padding: 36px;
}
.ark-board-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ark-text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.ark-board-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ark-board-item h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--ark-silver);
  margin-bottom: 6px;
}
.ark-board-item p {
  font-size: 13px;
  color: var(--ark-text-secondary);
  line-height: 1.6;
}

/* ================= 09｜极简宽幅 FAQ ================= */
.ark-faq-section {
  padding: var(--ark-section-space) 0;
  position: relative;
}

.ark-faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ark-faq-item {
  background: var(--ark-bg-card);
  border: 1px solid var(--ark-border-subtle);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}
.ark-faq-item[open] {
  border-color: rgba(116, 230, 231, 0.4);
}

.ark-faq-summary {
  padding: 24px 28px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ark-text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.ark-faq-summary::-webkit-details-marker {
  display: none;
}
.ark-faq-summary::after {
  content: "+";
  font-size: 24px;
  font-weight: 300;
  color: var(--ark-cyan);
  transition: transform 0.2s ease;
}
.ark-faq-item[open] .ark-faq-summary::after {
  content: "−";
  transform: rotate(180deg);
}

.ark-faq-body {
  padding: 0 28px 24px 28px;
  font-size: 15px;
  color: var(--ark-text-secondary);
  line-height: 1.7;
}

/* ================= 10｜最终转化舞台 ================= */
.ark-cta-stage-section {
  padding: clamp(100px, 15vh, 180px) 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(154, 124, 255, 0.25) 0%, rgba(116, 230, 231, 0.1) 40%, var(--ark-bg-primary) 80%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.ark-cta-glow-beam {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--ark-grad-aurora);
  box-shadow: 0 0 40px var(--ark-cyan);
}

.ark-cta-stage-title {
  font-size: clamp(36px, 5.5vw, 72px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--ark-text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.ark-cta-stage-desc {
  font-size: var(--ark-font-lead);
  color: var(--ark-text-secondary);
  max-width: 640px;
  margin: 0 auto 40px auto;
}

/* ================= 11｜极简页脚 ================= */
.ark-footer {
  padding: 80px 0 40px 0;
  background: #05060E;
  border-top: 1px solid var(--ark-border-subtle);
  position: relative;
}

.ark-footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 64px;
  flex-wrap: wrap;
  gap: 40px;
}

.ark-footer-brand p {
  color: var(--ark-text-muted);
  font-size: 14px;
  max-width: 320px;
  margin-top: 16px;
  line-height: 1.6;
}

.ark-footer-links-group {
  display: flex;
  gap: 64px;
  flex-wrap: wrap;
}

.ark-footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ark-silver);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 20px;
}

.ark-footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ark-footer-col a {
  color: var(--ark-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}
.ark-footer-col a:hover {
  color: var(--ark-cyan);
}

.ark-footer-bottom {
  border-top: 1px solid rgba(220, 230, 255, 0.08);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--ark-text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

/* ================= 响应式媒体查询 ================= */
@media (max-width: 1024px) {
  .ark-manifesto-grid,
  .ark-block-02,
  .ark-block-03-grid,
  .ark-reviews-grid,
  .ark-board-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .ark-block-01 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .ark-footer-links-group {
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .ark-menu-toggle {
    display: flex;
  }

  .ark-nav-links {
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    background: rgba(8, 10, 22, 0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 32px 24px;
    gap: 24px;
    border-bottom: 1px solid var(--ark-border-subtle);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }
  .ark-nav-links.is-open {
    transform: translateY(0);
  }

  .ark-step-card {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .ark-step-card:nth-child(even) {
    margin-left: 0;
  }

  .ark-device-notes {
    flex-direction: column;
    align-items: flex-start;
  }

  .ark-hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .ark-hero-actions .ark-btn {
    width: 100%;
  }

  .ark-tier-specs-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 390px) {
  .ark-container,
  .ark-container-wide {
    padding-left: 16px;
    padding-right: 16px;
  }
  .ark-scenario-card {
    width: 300px;
    padding: 18px;
  }
}

/* prefers-reduced-motion 降级 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}