@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Hebrew:wght@300;400;500;700&display=swap');

/* ===== 基础重置 & 变量 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue: #3bb1ff;
  --red: #ff5252;
  --black: #000000;
  --white: #ffffff;
  --yellow: #ffe44d;
  --bg: #f5f5f0;
  --border: 3px solid #000;
  --shadow: 5px 5px 0 #000;
  --shadow-sm: 3px 3px 0 #000;
  --shadow-lg: 8px 8px 0 #000;
  --radius: 0px;
  --radius-card: 10px;
  --font: 'Noto Sans Hebrew', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --header-h: 64px;
  --sticky-h: 40px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--black);
  background: var(--bg);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ===== 全屏遮罩菜单 ===== */
.nb-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--black);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 2rem 3rem;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
}

.nb-overlay.is-open {
  transform: translateX(0);
}

.nb-overlay[aria-hidden="true"] {
  transform: translateX(-100%);
}

.nb-overlay[aria-hidden="false"] {
  transform: translateX(0);
}

.overlay-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--red);
  border: var(--border);
  color: var(--white);
  font-size: 1.5rem;
  width: 48px;
  height: 48px;
  cursor: pointer;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.overlay-close:hover {
  background: var(--blue);
  color: var(--black);
}

.overlay-nav dl {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.overlay-nav dt,
.overlay-nav dd {
  margin: 0;
}

.overlay-nav dt a,
.overlay-nav dd a {
  display: block;
  color: var(--white);
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 700;
  padding: 0.5rem 0;
  border-bottom: 2px solid rgba(255,255,255,0.15);
  transition: color 0.15s, padding-left 0.15s;
}

.overlay-nav dt a:hover,
.overlay-nav dd a:hover {
  color: var(--blue);
  padding-left: 1rem;
}

/* ===== 顶部 Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--white);
  border-bottom: var(--border);
  box-shadow: 0 3px 0 #000;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--black);
  margin-right: auto;
  white-space: nowrap;
}

.brand:hover {
  color: var(--red);
}

.hamburger {
  background: var(--black);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  flex-shrink: 0;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
  transition: transform 0.2s;
}

.hamburger:hover {
  background: var(--blue);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 1.25rem;
  background: var(--red);
  color: var(--white);
  font-weight: 700;
  font-size: 0.9rem;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
  transition: transform 0.1s, box-shadow 0.1s;
  flex-shrink: 0;
}

.header-cta:hover {
  transform: translate(-2px,-2px);
  box-shadow: 7px 7px 0 #000;
}

/* ===== 粘性锚点条 ===== */
.sticky-anchors {
  position: sticky;
  top: var(--header-h);
  z-index: 90;
  background: var(--yellow);
  border-bottom: var(--border);
  height: var(--sticky-h);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  margin-top: var(--header-h);
  overflow-x: auto;
  white-space: nowrap;
}

.sticky-anchors a {
  font-weight: 700;
  color: var(--black);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.sticky-anchors a:hover {
  color: var(--red);
}

.anchor-sep {
  color: var(--black);
  opacity: 0.4;
}

.anchor-current {
  color: var(--black);
  font-weight: 700;
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: var(--blue);
  color: var(--black);
  font-weight: 700;
  font-size: 1rem;
  border: var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.1s;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translate(-3px,-3px);
  box-shadow: 8px 8px 0 #000;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  font-size: 1rem;
  border: var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.1s;
  white-space: nowrap;
}

.btn-secondary:hover {
  transform: translate(-3px,-3px);
  box-shadow: 8px 8px 0 #000;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: var(--white);
  color: var(--black);
  font-weight: 700;
  font-size: 1rem;
  border: var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.1s;
  white-space: nowrap;
}

.btn-outline:hover {
  background: var(--black);
  color: var(--white);
  transform: translate(-3px,-3px);
  box-shadow: 8px 8px 0 var(--red);
}

.btn-large {
  font-size: 1.1rem;
  padding: 1rem 2.5rem;
}

/* ===== Hero 首页 ===== */
.hero-section {
  position: relative;
  min-height: 70vh;
  background: var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: var(--header-h);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  padding-bottom: 8vh;
}

.hero-bg-text {
  position: absolute;
  font-size: clamp(8rem, 22vw, 20rem);
  font-weight: 700;
  color: rgba(255,255,255,0.04);
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  pointer-events: none;
  white-space: nowrap;
  letter-spacing: -0.05em;
  user-select: none;
  z-index: 0;
}

.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 4rem 2rem 2rem;
  max-width: 860px;
  width: 100%;
}

.hero-eyebrow {
  display: inline-block;
  background: var(--blue);
  color: var(--black);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 0.2rem 0.8rem;
  border: 2px solid var(--black);
  box-shadow: 2px 2px 0 #000;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-clip {
  display: none;
}

/* ===== 通用 page-hero（非首页）===== */
.page-hero {
  position: relative;
  background: var(--black);
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: var(--header-h);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
  padding-bottom: 5vh;
}

.page-hero-bg-text {
  position: absolute;
  font-size: clamp(6rem, 18vw, 16rem);
  font-weight: 700;
  color: rgba(255,255,255,0.05);
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  pointer-events: none;
  white-space: nowrap;
  letter-spacing: -0.05em;
  user-select: none;
  z-index: 0;
}

.page-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 4rem 2rem 2rem;
  max-width: 800px;
  width: 100%;
}

.page-hero-content h1 {
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.page-hero-content .hero-eyebrow {
  display: inline-block;
  background: var(--red);
  color: var(--white);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.2rem 0.75rem;
  border: 2px solid var(--black);
  box-shadow: 2px 2px 0 #000;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.page-hero-content .hero-sub {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* ===== feature hero ===== */
.feature-hero {
  position: relative;
  background: var(--black);
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  margin-top: var(--header-h);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 6% 100%);
  padding-bottom: 6vh;
}

.feature-hero-bg-text {
  position: absolute;
  font-size: clamp(8rem, 20vw, 18rem);
  font-weight: 700;
  color: rgba(59,177,255,0.08);
  top: 50%;
  right: 5%;
  transform: translateY(-50%);
  pointer-events: none;
  white-space: nowrap;
  user-select: none;
  z-index: 0;
}

.feature-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
  z-index: 0;
}

.feature-hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 2rem 2rem 3rem;
  max-width: 700px;
}

.feature-hero-content h1 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.feature-hero-content .hero-eyebrow {
  display: inline-block;
  background: var(--blue);
  color: var(--black);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.2rem 0.75rem;
  border: 2px solid var(--black);
  box-shadow: 2px 2px 0 #000;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== about hero ===== */
.about-hero {
  position: relative;
  background: var(--blue);
  border-bottom: var(--border);
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  margin-top: var(--header-h);
  padding-bottom: 3rem;
}

.about-hero-bg-text {
  position: absolute;
  font-size: clamp(5rem, 15vw, 14rem);
  font-weight: 700;
  color: rgba(0,0,0,0.07);
  top: 50%;
  right: 5%;
  transform: translateY(-50%);
  pointer-events: none;
  white-space: nowrap;
  user-select: none;
  z-index: 0;
}

.about-hero-img {
  position: absolute;
  right: 0;
  top: 0;
  width: 45%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  z-index: 0;
}

.about-hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 2rem 2rem 3rem;
  max-width: 700px;
}

.about-hero-content h1 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--black);
  line-height: 1.2;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.about-hero-content .hero-eyebrow {
  display: inline-block;
  background: var(--black);
  color: var(--white);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.2rem 0.75rem;
  border: 2px solid var(--black);
  box-shadow: 2px 2px 0 rgba(0,0,0,0.4);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.about-hero-content .hero-sub {
  color: rgba(0,0,0,0.75);
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* ===== 内容区两栏布局（div > aside + article）===== */
.content-section,
.feature-body-section,
.pricing-body-section,
.faq-body-section,
.about-body-section,
.contact-body-section,
.privacy-body-section,
.default-body-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto;
  gap: 2.5rem;
  align-items: start;
  position: relative;
}

.content-section {
  grid-template-columns: 1fr 260px;
}

.section-deco,
.feature-deco,
.pricing-deco,
.faq-section-deco,
.about-deco,
.contact-deco,
.privacy-deco,
.default-deco {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.5rem;
  margin-bottom: -1rem;
  pointer-events: none;
  border: none;
  margin: 0;
  padding: 0;
}

.deco-block {
  display: block;
  width: 32px;
  height: 8px;
  border: 2px solid var(--black);
}

.deco-blue { background: var(--blue); }
.deco-red { background: var(--red); }
.deco-yellow { background: var(--yellow); }

/* ===== 侧边栏 ===== */
.sidebar-nav {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  position: sticky;
  top: calc(var(--header-h) + var(--sticky-h) + 1rem);
}

.sidebar-nav h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--black);
}

.sidebar-nav .subtitle {
  font-size: 0.8rem;
  color: #555;
  margin-bottom: 1rem;
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-links li a {
  display: block;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: 2px solid transparent;
  border-bottom-color: var(--black);
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.sidebar-links li a:hover {
  background: var(--blue);
  border-color: var(--black);
  transform: translateX(4px);
}

.sidebar-cta {
  margin-top: 1.25rem;
}

/* ===== 正文区域 ===== */
.main-content-body {
  min-width: 0;
}

.prose-content {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--black);
}

.prose-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid var(--black);
}

.prose-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.5rem 0 0.4rem;
}

.prose-content p {
  margin-bottom: 1rem;
}

.prose-content ul,
.prose-content ol {
  margin: 0.75rem 0 1rem 1.5rem;
  list-style: disc;
}

.prose-content ol {
  list-style: decimal;
}

.prose-content li {
  margin-bottom: 0.4rem;
}

.prose-content a {
  color: var(--black);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--blue);
  text-underline-offset: 3px;
}

.prose-content a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}

.prose-content blockquote {
  border-left: 5px solid var(--blue);
  padding: 0.75rem 1rem;
  background: var(--white);
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
  border-top: var(--border);
  border-right: var(--border);
  border-bottom: var(--border);
}

.prose-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.prose-content th {
  background: var(--black);
  color: var(--white);
  padding: 0.6rem 1rem;
  text-align: left;
  font-weight: 700;
}

.prose-content td {
  padding: 0.6rem 1rem;
  border-bottom: 2px solid var(--black);
  border-left: 1px solid #ddd;
}

.prose-content td:first-child {
  border-left: 2px solid var(--black);
}

.prose-content td:last-child {
  border-right: 2px solid var(--black);
}

/* ===== 日期标签 ===== */
.page-date,
.page-mod {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.6);
  margin-top: 0.5rem;
  margin-right: 0.75rem;
  padding: 0.15rem 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
}

/* ===== 功能卡片网格 ===== */
.features-section {
  background: var(--bg);
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.features-section h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.features-section .subtitle {
  color: #555;
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-grid li {
  display: flex;
}

.feature-card {
  width: 100%;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--card-accent, var(--blue));
  color: var(--card-text, var(--black));
  border: var(--border);
  box-shadow: var(--shadow);
  border-radius: var(--radius-card);
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s;
}

.feature-card:hover {
  transform: translate(-3px,-3px);
  box-shadow: 8px 8px 0 #000;
}

.card-num {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.25;
  margin-bottom: 0.75rem;
  letter-spacing: -0.04em;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card h3 a {
  color: inherit;
  text-decoration: none;
}

.feature-card h3 a:hover {
  text-decoration: underline;
}

.feature-card p {
  font-size: 0.9rem;
  line-height: 1.55;
  flex: 1;
  opacity: 0.85;
  margin-bottom: 1rem;
}

.card-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  background: rgba(0,0,0,0.12);
  border: 2px solid currentColor;
  color: inherit;
  transition: background 0.15s;
  align-self: flex-start;
  margin-top: auto;
  border-bottom: 3px solid currentColor;
}

.card-link:hover {
  background: rgba(0,0,0,0.22);
}

/* ===== CTA 带状区 ===== */
.cta-band,
.feature-cta-section,
.pricing-faq-link-section,
.faq-contact-section,
.about-cta-section,
.contact-info-section {
  background: var(--black);
  color: var(--white);
  padding: 4rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}

.cta-deco,
.feature-cta-deco,
.faq-contact-deco,
.about-cta-deco,
.contact-info-deco {
  flex-shrink: 0;
  border: none;
  background: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.deco-num {
  display: block;
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  color: rgba(255,255,255,0.08);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.cta-aside,
.about-cta-section .cta-aside,
.faq-contact-section .cta-aside,
.contact-info-section .cta-aside,
.pricing-faq-link-section .cta-aside {
  flex: 1;
  min-width: 220px;
}

.cta-aside h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--white);
}

.cta-aside .subtitle {
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ===== 首页内容区 ===== */
.page-content-wrap {
  grid-template-columns: 1fr 260px;
}

.page-content-wrap .main-content-body {
  order: 1;
}

.page-content-wrap .sidebar-nav {
  order: 2;
}

/* ===== FAQ 内容样式 ===== */
.faq-content :is(h2, h3) {
  position: relative;
  padding-left: 1rem;
}

.faq-content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2em;
  width: 5px;
  height: 1em;
  background: var(--red);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg);
  border-top: var(--border);
  margin-top: 0;
  padding: 0;
}

.footer-brand-row {
  background: var(--black);
  padding: 2.5rem 1.5rem 2rem;
  display: flex;
  align-items: center;
}

.footer-brand-big {
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1;
  display: block;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
  border-top: 2px solid rgba(0,0,0,0.1);
}

.footer-address {
  font-style: normal;
  font-size: 0.85rem;
  color: #555;
  flex-shrink: 0;
}

.site-footer nav[aria-label="页脚导航"] {
  display: none;
}

.footer-links {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.footer-links li a {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  border: 2px solid var(--black);
  color: var(--black);
  background: var(--white);
  box-shadow: 2px 2px 0 #000;
  transition: background 0.15s, color 0.15s;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-links li a:hover {
  background: var(--black);
  color: var(--white);
}

/* ===== 子页列表（ul>li>section）===== */
.child-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.child-list li {
  display: flex;
}

.child-list section {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  border-radius: var(--radius-card);
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  border-bottom: 4px solid var(--blue);
}

.child-list section:hover {
  transform: translate(-2px,-2px);
  box-shadow: 8px 8px 0 #000;
}

.child-list h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.child-list h3 a {
  color: var(--black);
  text-decoration: none;
}

.child-list h3 a:hover {
  color: var(--red);
  text-decoration: underline;
}

.child-list p {
  font-size: 0.9rem;
  color: #444;
  margin: 0;
}

/* ===== h2 + .subtitle ===== */
h2 + .subtitle,
h2 + p.subtitle,
h2 + p.subhead,
h2 + p.desc,
h2 + p.lead {
  font-size: 0.95rem;
  color: #555;
  margin-top: 0.25rem;
  margin-bottom: 1.25rem;
}

/* ===== Stagger 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .feature-card {
    animation: nb-fade-up 0.4s ease both;
  }

  .feature-grid li:nth-child(1) .feature-card { animation-delay: 0.05s; }
  .feature-grid li:nth-child(2) .feature-card { animation-delay: 0.12s; }
  .feature-grid li:nth-child(3) .feature-card { animation-delay: 0.19s; }
  .feature-grid li:nth-child(4) .feature-card { animation-delay: 0.26s; }
  .feature-grid li:nth-child(5) .feature-card { animation-delay: 0.33s; }
  .feature-grid li:nth-child(6) .feature-card { animation-delay: 0.40s; }

  .child-list li {
    animation: nb-fade-up 0.35s ease both;
  }
  .child-list li:nth-child(1) { animation-delay: 0.05s; }
  .child-list li:nth-child(2) { animation-delay: 0.12s; }
  .child-list li:nth-child(3) { animation-delay: 0.19s; }
  .child-list li:nth-child(4) { animation-delay: 0.26s; }
  .child-list li:nth-child(5) { animation-delay: 0.33s; }

  @keyframes nb-fade-up {
    from {
      opacity: 0;
      transform: translateY(16px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .hero-content h1,
  .feature-hero-content h1,
  .about-hero-content h1,
  .page-hero-content h1 {
    animation: nb-fade-up 0.5s 0.1s ease both;
  }

  .hero-sub,
  .hero-actions {
    animation: nb-fade-up 0.5s 0.25s ease both;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ===== 响应式断点 ===== */
@media (max-width: 900px) {
  .content-section,
  .feature-body-section,
  .pricing-body-section,
  .faq-body-section,
  .about-body-section,
  .contact-body-section,
  .privacy-body-section,
  .default-body-section,
  .page-content-wrap {
    grid-template-columns: 1fr;
  }

  .sidebar-nav {
    position: static;
    order: 10;
  }

  .page-content-wrap .sidebar-nav {
    order: 10;
  }
}

@media (max-width: 600px) {
  :root {
    --header-h: 56px;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .brand {
    font-size: 1.1rem;
  }

  .hero-content h1 {
    font-size: 1.9rem;
  }

  .hero-content,
  .feature-hero-content,
  .about-hero-content,
  .page-hero-content {
    padding: 3rem 1.25rem 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .features-section {
    padding: 2.5rem 1rem;
  }

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

  .cta-band,
  .feature-cta-section,
  .pricing-faq-link-section,
  .faq-contact-section,
  .about-cta-section,
  .contact-info-section {
    flex-direction: column;
    gap: 1.5rem;
    padding: 2.5rem 1.25rem;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .cta-actions .btn-primary,
  .cta-actions .btn-outline {
    width: 100%;
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .sticky-anchors {
    font-size: 0.78rem;
    padding: 0 1rem;
  }

  .content-section,
  .feature-body-section,
  .pricing-body-section,
  .faq-body-section,
  .about-body-section,
  .contact-body-section,
  .privacy-body-section,
  .default-body-section {
    padding: 2.5rem 1rem;
    gap: 1.5rem;
  }

  .about-hero {
    clip-path: none;
  }

  .footer-links li a {
    padding: 0.5rem 0.6rem;
    font-size: 0.75rem;
    min-height: 44px;
  }
}

/* ===== 无障碍焦点样式 ===== */
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

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