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

/* =========================================
   CSS 自定义属性
   ========================================= */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-gray-800: #222222;
  --c-accent: #1a1a1a;

  --ff-sans: 'Noto Sans KR', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --fs-base: 17px;
  --lh-base: 1.7;

  --header-h: 64px;
  --sticky-h: 44px;
  --max-w: 1280px;
  --content-w: 720px;

  --gap-sm: 16px;
  --gap-md: 32px;
  --gap-lg: 64px;
  --gap-xl: 96px;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================
   重置与基础
   ========================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--fs-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--ff-sans);
  line-height: var(--lh-base);
  color: var(--c-black);
  background: var(--c-white);
  overflow-x: hidden;
}

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

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

ul, ol {
  list-style: none;
}

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

/* =========================================
   排版
   ========================================= */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(1.8rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

p { margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }

/* =========================================
   按钮
   ========================================= */
.btn-primary,
.btn-outline,
.btn-ghost,
.btn-cta {
  display: inline-block;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-align: center;
  cursor: pointer;
  min-height: 44px;
  border-radius: 0;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--c-black);
  color: var(--c-white);
  border: 2px solid var(--c-black);
}
.btn-primary:hover {
  background: var(--c-gray-800);
  border-color: var(--c-gray-800);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--c-black);
  border: 2px solid var(--c-black);
}
.btn-outline:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--c-white);
  border: 2px solid var(--c-white);
}
.btn-ghost:hover {
  background: var(--c-white);
  color: var(--c-black);
  text-decoration: none;
}

.btn-cta {
  background: var(--c-black);
  color: var(--c-white);
  border: 2px solid var(--c-black);
  font-size: 0.85rem;
  padding: 10px 20px;
}
.btn-cta:hover {
  background: var(--c-white);
  color: var(--c-black);
  text-decoration: none;
}

/* =========================================
   全局包装
   ========================================= */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =========================================
   顶部导航
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--c-white);
  border-bottom: 2px solid var(--c-black);
  height: var(--header-h);
}

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

.brand-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  min-height: 44px;
}

.brand-mono {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-black);
  border: 2px solid var(--c-black);
  padding: 4px 10px;
  line-height: 1;
}

.logo-mark {
  height: 40px;
  width: auto;
}

.header-aside {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  flex: 1;
  justify-content: flex-end;
}

.header-nav-list {
  display: none;
  align-items: center;
  gap: 4px;
}

.header-nav-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.85rem;
  font-weight: 500;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: background var(--transition);
  white-space: nowrap;
}

.header-nav-list li a:hover,
.header-nav-list li a[aria-current="page"] {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

/* =========================================
   汉堡按钮
   ========================================= */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  z-index: 300;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-black);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.is-active span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================
   全屏遮罩菜单
   ========================================= */
.overlay-menu {
  position: fixed;
  inset: 0;
  background: var(--c-black);
  color: var(--c-white);
  z-index: 500;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.overlay-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.overlay-close {
  position: absolute;
  top: var(--gap-md);
  right: var(--gap-md);
  color: var(--c-white);
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--c-white);
  transition: background var(--transition);
}

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

.overlay-nav-list {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.overlay-nav-list li a {
  display: block;
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--c-white);
  padding: 10px 20px;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid rgba(255,255,255,0.2);
  transition: color var(--transition), border-color var(--transition);
}

.overlay-nav-list li a:hover {
  color: var(--c-gray-400);
  text-decoration: none;
  border-bottom-color: var(--c-gray-400);
}

/* =========================================
   粘性子导航条
   ========================================= */
.sticky-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 100;
  background: var(--c-black);
  color: var(--c-white);
  height: var(--sticky-h);
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.sticky-bar::-webkit-scrollbar { display: none; }

.sticky-bar a {
  display: flex;
  align-items: center;
  padding: 0 var(--gap-md);
  height: 100%;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-white);
  white-space: nowrap;
  border-right: 1px solid rgba(255,255,255,0.2);
  min-height: 44px;
  transition: background var(--transition);
}

.sticky-bar a:hover {
  background: rgba(255,255,255,0.1);
  text-decoration: none;
}

/* =========================================
   面包屑
   ========================================= */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--c-gray-600);
  margin-bottom: var(--gap-sm);
}

.breadcrumb a {
  color: var(--c-gray-600);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* =========================================
   眉题 / 小标签
   ========================================= */
.eyebrow-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-gray-600);
  border-left: 3px solid var(--c-black);
  padding-left: 8px;
  margin-bottom: 10px;
}

/* =========================================
   卡片 通用
   ========================================= */
.card-item {
  border-bottom: 3px solid var(--c-black);
  padding: var(--gap-md) 0 var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--transition);
}

.card-item:hover {
  border-bottom-color: var(--c-gray-600);
}

.card-eyebrow {
  font-size: 0.78rem;
  color: var(--c-gray-400);
}

.card-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.card-item h3 a:hover {
  text-decoration: none;
  border-bottom: 2px solid var(--c-black);
}

.card-item p {
  font-size: 0.92rem;
  color: var(--c-gray-600);
  line-height: 1.6;
}

.card-more {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-bottom: 1px solid currentColor;
  align-self: flex-start;
}

/* =========================================
   卡片网格
   ========================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap-md);
}

/* =========================================
   Pull Quote
   ========================================= */
.pull-quote-wrap {
  margin: var(--gap-lg) 0;
}

.pull-quote {
  border-left: 4px solid var(--c-black);
  padding: var(--gap-md) var(--gap-md) var(--gap-md) var(--gap-md);
  background: var(--c-gray-100);
}

.pull-quote p {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 500;
  line-height: 1.6;
  font-style: italic;
  margin: 0;
}

/* =========================================
   Drop cap
   ========================================= */
.feature-drop-cap-content > p:first-of-type::first-letter,
.about-drop-cap-content > p:first-of-type::first-letter {
  font-size: 3.5em;
  font-weight: 700;
  float: left;
  line-height: 0.85;
  margin-right: 8px;
  margin-top: 6px;
  color: var(--c-black);
}

/* =========================================
   侧边栏通用
   ========================================= */
.home-aside,
.feature-aside,
.pricing-aside,
.faq-aside,
.about-aside,
.contact-aside,
.privacy-aside,
.default-aside {
  flex-shrink: 0;
}

.aside-block {
  border-top: 2px solid var(--c-black);
  padding: var(--gap-md) 0;
  margin-top: var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-block h3 {
  font-size: 1rem;
  font-weight: 700;
}

.aside-block p {
  font-size: 0.88rem;
  color: var(--c-gray-600);
}

/* 侧边 nav 样式 */
.home-aside nav ul,
.feature-aside nav ul,
.pricing-aside nav ul,
.faq-aside nav ul,
.about-aside nav ul,
.contact-aside nav ul,
.privacy-aside nav ul,
.default-aside nav ul {
  border-top: 2px solid var(--c-black);
}

.home-aside nav ul li a,
.feature-aside nav ul li a,
.pricing-aside nav ul li a,
.faq-aside nav ul li a,
.about-aside nav ul li a,
.contact-aside nav ul li a,
.privacy-aside nav ul li a,
.default-aside nav ul li a {
  display: block;
  padding: 10px 0;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--c-gray-200);
  transition: padding-left var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.home-aside nav ul li a:hover,
.feature-aside nav ul li a:hover,
.pricing-aside nav ul li a:hover,
.about-aside nav ul li a:hover,
.faq-aside nav ul li a:hover,
.contact-aside nav ul li a:hover,
.privacy-aside nav ul li a:hover,
.default-aside nav ul li a:hover {
  padding-left: 8px;
  text-decoration: none;
}

.home-aside nav ul li a[aria-current="page"],
.feature-aside nav ul li a[aria-current="page"],
.pricing-aside nav ul li a[aria-current="page"],
.about-aside nav ul li a[aria-current="page"] {
  font-weight: 700;
  border-left: 3px solid var(--c-black);
  padding-left: 8px;
}

/* =========================================
   页脚
   ========================================= */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  margin-top: auto;
  padding: var(--gap-lg) var(--gap-md) var(--gap-md);
}

.footer-brand {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--c-white);
  border-bottom: 2px solid rgba(255,255,255,0.2);
  padding-bottom: var(--gap-md);
  margin-bottom: var(--gap-lg);
  line-height: 1.1;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-md);
  margin-bottom: var(--gap-lg);
}

.footer-cols dl dt {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray-400);
  margin-bottom: var(--gap-sm);
  border-bottom: 1px solid rgba(255,255,255,0.15);
  padding-bottom: 8px;
}

.footer-cols dl dd {
  margin-bottom: 8px;
}

.footer-cols dl dd a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
  display: block;
  min-height: 28px;
  display: flex;
  align-items: center;
}

.footer-cols dl dd a:hover {
  color: var(--c-white);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: var(--gap-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--gap-sm);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
}

.footer-bottom a {
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
}

.footer-bottom a:hover {
  color: var(--c-white);
  text-decoration: none;
}

/* =========================================
   首页 Hero
   ========================================= */
.hero-section {
  position: relative;
  min-height: 45vh;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--gap-lg) var(--gap-md);
}

.hero-bg-text {
  position: absolute;
  font-size: clamp(8rem, 25vw, 20rem);
  font-weight: 700;
  color: rgba(255,255,255,0.04);
  letter-spacing: -0.05em;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.hero-collage {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  opacity: 0.08;
  pointer-events: none;
}

.hero-tile {
  background: var(--c-white);
}

.hero-tile-a {
  transform: translateY(-20px);
}

.hero-tile-b {
  transform: translateY(20px);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-md);
}

.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
}

.hero-h1 {
  font-size: clamp(1.8rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  line-height: 1.7;
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: var(--gap-sm);
  flex-wrap: wrap;
  justify-content: center;
}

/* =========================================
   首页主体布局
   ========================================= */
.home-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--gap-lg);
  align-items: start;
}

.home-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.home-content-section .content-columns {
  font-size: 1rem;
  line-height: var(--lh-base);
}

.section-header {
  margin-bottom: var(--gap-md);
}

.features-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.pricing-teaser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-lg);
  align-items: center;
}

.teaser-cta {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.faq-teaser {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  padding: var(--gap-lg);
  background: var(--c-gray-100);
  border-left: 4px solid var(--c-black);
}

/* =========================================
   Feature 页面布局
   ========================================= */
.feature-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.feature-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.feature-header-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-lg);
  align-items: start;
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
}

.feature-header-inner {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.feature-h1 {
  margin-top: 8px;
}

.feature-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  line-height: 1.7;
  margin: 0;
}

.feature-hero-figure {
  overflow: hidden;
  background: var(--c-gray-100);
  border: 2px solid var(--c-black);
}

.feature-hero-img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.feature-hero-placeholder {
  width: 100%;
  height: 260px;
  background: repeating-linear-gradient(
    45deg,
    var(--c-gray-100),
    var(--c-gray-100) 10px,
    var(--c-gray-200) 10px,
    var(--c-gray-200) 20px
  );
  border: 2px solid var(--c-black);
}

.feature-hero-figure figcaption {
  font-size: 0.78rem;
  color: var(--c-gray-600);
  padding: 8px 12px;
  border-top: 1px solid var(--c-gray-200);
}

.feature-body-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

.feature-cta-block {
  background: var(--c-black);
  color: var(--c-white);
  padding: var(--gap-lg);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.feature-cta-block .eyebrow-label {
  color: rgba(255,255,255,0.6);
  border-left-color: var(--c-white);
}

.feature-cta-block h2 {
  color: var(--c-white);
}

.feature-cta-block p {
  color: rgba(255,255,255,0.8);
}

.related-list li {
  border-bottom: 1px solid var(--c-gray-200);
}

.related-list li a {
  display: block;
  padding: 8px 0;
  font-size: 0.88rem;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: padding-left var(--transition);
}

.related-list li a:hover {
  padding-left: 8px;
  text-decoration: none;
}

.article-meta {
  font-size: 0.82rem;
  color: var(--c-gray-400);
}

/* =========================================
   Pricing 页面布局
   ========================================= */
.pricing-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.pricing-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.pricing-hero-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--gap-lg);
  align-items: center;
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
}

.pricing-hero-inner {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.pricing-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

.pricing-decoration {
  text-align: right;
}

.deco-number {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  color: var(--c-gray-200);
  letter-spacing: -0.05em;
  line-height: 1;
  display: block;
}

.pricing-content-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.pricing-tiers-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-md);
  margin-top: var(--gap-md);
}

.pricing-card {
  border: 2px solid var(--c-black);
  padding: var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 6px 6px 0 var(--c-black);
}

.pricing-card-monthly {
  background: var(--c-black);
  color: var(--c-white);
}

.pricing-card-monthly .btn-primary {
  background: var(--c-white);
  color: var(--c-black);
  border-color: var(--c-white);
}

.pricing-card-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plan-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  padding: 2px 8px;
  align-self: flex-start;
}

.plan-badge-hot {
  background: var(--c-white);
  color: var(--c-black);
  border-color: var(--c-white);
}

.plan-price {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.plan-price span {
  font-size: 0.85rem;
  font-weight: 400;
  opacity: 0.7;
}

.plan-name {
  font-size: 0.88rem;
  font-weight: 500;
  opacity: 0.8;
}

.plan-features {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.plan-features li {
  font-size: 0.9rem;
  padding-left: 16px;
  position: relative;
}

.plan-features li::before {
  content: '—';
  position: absolute;
  left: 0;
  opacity: 0.5;
}

.pricing-faq-teaser {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  background: var(--c-gray-100);
  padding: var(--gap-lg);
  border-top: 3px solid var(--c-black);
}

/* =========================================
   FAQ 页面布局
   ========================================= */
.faq-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.faq-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.faq-header-section {
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.faq-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

.faq-content-wrap {
  font-size: 1rem;
  line-height: var(--lh-base);
}

.faq-cta-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  padding: var(--gap-lg);
  background: var(--c-gray-100);
}

.quick-links li {
  border-bottom: 1px solid var(--c-gray-200);
}

.quick-links li a {
  display: flex;
  align-items: center;
  padding: 8px 0;
  font-size: 0.88rem;
  min-height: 40px;
  transition: padding-left var(--transition);
}

.quick-links li a:hover {
  padding-left: 8px;
  text-decoration: none;
}

/* =========================================
   About 页面布局
   ========================================= */
.about-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.about-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.about-header-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--gap-lg);
  align-items: start;
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
}

.about-header-text {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.about-header-deco {
  align-self: center;
}

.about-header-deco .deco-number {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--c-gray-200);
  writing-mode: vertical-rl;
  letter-spacing: 0.1em;
  line-height: 1;
}

.about-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

.about-content-section {
  display: flex;
  flex-direction: column;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-md);
  margin-top: var(--gap-md);
}

.value-item {
  border-top: 3px solid var(--c-black);
  padding-top: var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.value-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-gray-200);
  line-height: 1;
}

.value-item h3 {
  font-size: 1rem;
}

.value-item p {
  font-size: 0.9rem;
  color: var(--c-gray-600);
}

.about-values-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

/* =========================================
   Contact 页面布局
   ========================================= */
.contact-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.contact-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.contact-header-section {
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.contact-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

.contact-body-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

.contact-form-block {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.form-row input,
.form-row select,
.form-row textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 12px;
  border: 2px solid var(--c-black);
  background: var(--c-white);
  color: var(--c-black);
  border-radius: 0;
  transition: border-color var(--transition);
  min-height: 44px;
  width: 100%;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--c-gray-600);
}

.form-row textarea {
  resize: vertical;
  min-height: 120px;
}

/* =========================================
   Privacy 页面布局
   ========================================= */
.privacy-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.privacy-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.privacy-header-section {
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.privacy-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

.privacy-date {
  font-size: 0.82rem;
  color: var(--c-gray-400);
  margin: 0;
}

.privacy-body-section {
  display: flex;
  flex-direction: column;
}

.privacy-content-wrap {
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: var(--content-w);
}

.privacy-nav-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.privacy-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: var(--gap-sm);
}

.privacy-links li a {
  display: inline-block;
  border: 2px solid var(--c-black);
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background var(--transition), color var(--transition);
}

.privacy-links li a:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

/* =========================================
   Default 页面布局
   ========================================= */
.default-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  align-items: start;
}

.default-article {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-xl);
}

.default-header-section {
  padding-bottom: var(--gap-lg);
  border-bottom: 2px solid var(--c-black);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.default-lead {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  margin: 0;
}

/* =========================================
   正文内容排版（全局）
   ========================================= */
.home-content-section h2,
.feature-drop-cap-content h2,
.about-drop-cap-content h2,
.faq-content-wrap h2,
.pricing-prose h2,
.privacy-content-wrap h2,
.contact-content-wrap h2,
.default-article h2 {
  margin-top: 2em;
  margin-bottom: 0.75em;
  padding-top: 0.5em;
  border-top: 1px solid var(--c-gray-200);
}

.home-content-section h3,
.feature-drop-cap-content h3,
.about-drop-cap-content h3,
.faq-content-wrap h3,
.pricing-prose h3,
.privacy-content-wrap h3,
.contact-content-wrap h3 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.feature-drop-cap-content ul,
.about-drop-cap-content ul,
.faq-content-wrap ul,
.pricing-prose ul,
.privacy-content-wrap ul,
.contact-content-wrap ul,
.home-content-section ul {
  list-style: disc;
  padding-left: 1.5em;
  margin-bottom: 1em;
}

.feature-drop-cap-content ol,
.faq-content-wrap ol,
.privacy-content-wrap ol {
  list-style: decimal;
  padding-left: 1.5em;
  margin-bottom: 1em;
}

/* =========================================
   Scroll Reveal 动效
   ========================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .overlay-menu,
  .hamburger span,
  .card-item,
  .pricing-card,
  .btn-primary,
  .btn-outline,
  .btn-ghost,
  .btn-cta {
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* =========================================
   响应式 — 平板
   ========================================= */
@media (max-width: 1024px) {
  .home-main,
  .feature-main,
  .pricing-main,
  .faq-main,
  .about-main,
  .contact-main,
  .privacy-main,
  .default-main {
    grid-template-columns: 1fr 240px;
    gap: var(--gap-md);
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

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

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

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

/* =========================================
   响应式 — 手机
   ========================================= */
@media (max-width: 768px) {
  :root {
    --gap-lg: 40px;
    --gap-xl: 56px;
  }

  .home-main,
  .feature-main,
  .pricing-main,
  .faq-main,
  .about-main,
  .contact-main,
  .privacy-main,
  .default-main {
    grid-template-columns: 1fr;
    padding: var(--gap-md);
  }

  /* 侧边栏移到内容下方 */
  .home-aside,
  .feature-aside,
  .pricing-aside,
  .faq-aside,
  .about-aside,
  .contact-aside,
  .privacy-aside,
  .default-aside {
    border-top: 2px solid var(--c-black);
    padding-top: var(--gap-md);
  }

  .header-nav-list {
    display: none !important;
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }

  .pricing-grid {
    max-width: 100%;
  }

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

  .about-header-grid {
    grid-template-columns: 1fr;
  }

  .about-header-deco {
    display: none;
  }

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

  .hero-section {
    min-height: 55vh;
    padding: var(--gap-md);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-width: 320px;
  }

  .feature-hero-img,
  .feature-hero-placeholder {
    height: 180px;
  }

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

  .footer-cols {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    font-size: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .sticky-bar {
    padding-left: var(--gap-sm);
  }

  .sticky-bar a {
    padding: 0 var(--gap-sm);
    font-size: 0.78rem;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 1.6rem;
  }

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

  .privacy-links {
    flex-direction: column;
  }

  .header-inner {
    padding: 0 var(--gap-sm);
  }
}