/* ─── CSS Variables / Design Tokens ─── */
:root {
  /* Colors */
  --color-primary: #4f74e3;
  --color-primary-dark: #3a5bc7;
  --color-secondary: #10b981;
  --color-accent: #f59e0b;

  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-surface: #f1f5f9;
  --color-text: #1e293b;
  --color-text-muted: #64748b;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --container-max: 1200px;
  --header-height: 64px;
}

/* ─── Reset / Normalize ─── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

/* ─── Shared Component Styles ─── */

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-surface);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__brand {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  flex: none;
}

.navbar__brand:hover {
  color: var(--color-primary);
}

/* 汉堡按钮：桌面端隐藏 */
.navbar__toggle {
  display: none;
  flex: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-surface);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.navbar__toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-alt);
}

.navbar__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.navbar__bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.navbar__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

/* 展开时三横变叉 */
.navbar.is-open .navbar__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.navbar.is-open .navbar__bars span:nth-child(2) {
  opacity: 0;
}

.navbar.is-open .navbar__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.navbar__menu {
  display: flex;
  align-items: center;
}

.navbar__links {
  display: flex;
  gap: var(--space-6);
}

.navbar__link {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.navbar__link:hover {
  color: var(--color-primary);
}

.navbar__link.is-active {
  color: var(--color-primary);
  position: relative;
}

.navbar__link.is-active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 18px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  transform: translateX(-50%);
}

/* 移动端：折叠为下拉菜单 */
@media (max-width: 768px) {
  .navbar {
    position: sticky;
  }

  .navbar__toggle {
    display: inline-flex;
  }

  /* 菜单默认收起：max-height 0 + overflow hidden 才能做过渡动画 */
  .navbar__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    max-height: 0;
    overflow: hidden;
    background: var(--color-bg);
    border-bottom: 1px solid transparent;
    box-shadow: var(--shadow-lg);
    transition: max-height var(--transition-normal), border-color var(--transition-normal);
  }

  .navbar.is-open .navbar__menu {
    max-height: 320px;
    border-bottom-color: var(--color-surface);
  }

  .navbar__links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) 0;
  }

  .navbar__link {
    display: block;
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    color: var(--color-text);
    border-left: 3px solid transparent;
  }

  .navbar__link:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
  }

  /* 竖排菜单里左侧色条比底部下划线合适 */
  .navbar__link.is-active {
    border-left-color: var(--color-primary);
    background: rgba(79, 116, 227, 0.08);
    color: var(--color-primary);
    font-weight: 600;
  }

  .navbar__link.is-active::after {
    display: none;
  }
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-surface);
  margin-top: var(--space-8);
}

/* Feature Card 通用部分 */
.feature-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

/* Contact 联系方式区块 */
.contact {
  background: var(--color-bg);
}

.contact__title {
  text-align: center;
}

.contact__desc {
  margin-top: var(--space-4);
  text-align: center;
  font-size: var(--text-base);
  line-height: 1.7;
}

.contact__grid {
  margin-top: var(--space-10);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.contact__card {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-6);
  font: inherit;
  text-align: left;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.contact__card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform var(--transition-normal);
}

.contact__card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.contact__card:hover::before,
.contact__card.is-copied::before {
  transform: scaleY(1);
}

.contact__card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.contact__icon {
  flex: none;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  line-height: 1;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), transform var(--transition-normal);
}

.contact__card:hover .contact__icon {
  background: rgba(79, 116, 227, 0.12);
  transform: scale(1.06);
}

.contact__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.contact__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.contact__value {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  word-break: break-all;
}

.contact__tip {
  margin-top: 2px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.contact__action {
  flex: none;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(79, 116, 227, 0.12);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.contact__card:hover .contact__action {
  color: #fff;
  background: var(--color-primary);
}

.contact__card.is-copied {
  border-color: var(--color-secondary);
}

.contact__card.is-copied .contact__action {
  color: #fff;
  background: var(--color-secondary);
}

.contact__card.is-copied .contact__icon {
  background: rgba(16, 185, 129, 0.14);
}

.contact__note {
  margin-top: var(--space-6);
  text-align: center;
  font-size: var(--text-xs);
}

@media (max-width: 640px) {
  .contact__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .contact__card {
    padding: var(--space-5);
  }
}

/* WeChatFollow 公众号关注区块 */
.wechat-follow {
  background: var(--color-bg);
}

.wechat-follow__card {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-10);
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-10);
  background: linear-gradient(135deg, #ecfdf5 0%, #f7fafc 55%, var(--color-bg-alt) 100%);
  border: 1px solid rgba(16, 185, 129, 0.22);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

/* 右上角装饰光晕 */
.wechat-follow__glow {
  position: absolute;
  top: -70px;
  right: -70px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

/* 二维码区：图片 + 下方提示，纵向流式布局（不用绝对定位，避免被挤压变形） */
.wechat-follow__media {
  position: relative;
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.wechat-follow__qr {
  width: 152px;
  height: 152px;
  padding: var(--space-3);
  background: #fff;
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.wechat-follow__qr img {
  width: 100%;
  height: 100%;
  -o-object-fit: contain;
     object-fit: contain;
  display: block;
  border-radius: var(--radius-sm);
}

.wechat-follow__tip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

/* 右侧文本区 */
.wechat-follow__text {
  position: relative;
  flex: 1;
  min-width: 0;
  text-align: left;
}

.wechat-follow__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 3px var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-secondary);
  background: rgba(16, 185, 129, 0.14);
  border-radius: var(--radius-full);
}

.wechat-follow__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-secondary);
}

.wechat-follow__text .heading-md {
  margin-top: var(--space-4);
  font-size: var(--text-2xl);
}

.wechat-follow__desc {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* 特性清单 */
.wechat-follow__points {
  margin-top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
}

.wechat-follow__points li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.wechat-follow__check {
  flex: none;
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
}

@media (max-width: 560px) {
  .wechat-follow__card {
    flex-direction: column;
    text-align: center;
    gap: var(--space-8);
    padding: var(--space-6);
  }

  .wechat-follow__text {
    text-align: center;
  }

  .wechat-follow__points {
    align-items: center;
  }
}

/* ─── Global / Utility Styles ─── */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.heading-xl {
  font-size: var(--text-5xl);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.heading-lg {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.2;
}

.heading-md {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.3;
}

.text-muted {
  color: var(--color-text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--text-base);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

.btn--ghost {
  color: var(--color-text);
  background: transparent;
  border: 2px solid var(--color-surface);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

.flex {
  display: flex;
  align-items: center;
}

.flex--between { justify-content: space-between; }
.flex--center { justify-content: center; }
.flex--col { flex-direction: column; }

.card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

/* ─── LYZNote 页面专属样式 ─── */

/* Hero */
.hero {
  padding: var(--space-20) 0;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero__inner {
  align-items: center;
}

.hero__subtitle {
  margin-top: var(--space-4);
  font-size: var(--text-lg);
  line-height: 1.7;
}

.hero__actions {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero__visual img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

/* Download CTA */
.download-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
}

.download-cta .heading-lg,
.download-cta .text-muted {
  color: #fff;
}

.download-cta .text-muted {
  opacity: 0.85;
}

/* 平台按钮组（当前只有 Windows 一个按钮，宽度收窄避免拉得过宽） */
.platform-grid {
  margin-top: var(--space-10);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

.btn--platform {
  justify-content: flex-start;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(6px);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  text-align: left;
  line-height: 1.25;
}

.btn--platform:hover {
  background: #fff;
  color: var(--color-primary-dark);
  border-color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--platform:hover .btn__sub {
  color: var(--color-primary);
}

.btn__icon {
  font-size: var(--text-2xl);
  line-height: 1;
}

.btn__text {
  display: flex;
  flex-direction: column;
}

.btn__label {
  font-weight: 700;
  font-size: var(--text-base);
}

.btn__sub {
  font-size: var(--text-xs);
  font-weight: 500;
  opacity: 0.85;
  letter-spacing: 0.02em;
}

/* 即将推出（不可点击） */
.btn--soon {
  cursor: not-allowed;
  opacity: 0.55;
  background: rgba(255, 255, 255, 0.06);
  border: 1px dashed rgba(255, 255, 255, 0.35);
}

.btn--soon:hover {
  transform: none;
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: none;
}


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