/* ProductCraft 全站样式：黑色主题，深浅色模式，响应式 */

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

:root {
  --bg: #ffffff;
  --fg: #111111;
  --fg-2: #666666;
  --fg-3: #999999;
  --border: #e5e5e5;
  --accent-bg: #000000;
  --accent-fg: #ffffff;
  --hover: #f5f5f5;
  --icon-border: rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --container: 960px;
  --header-h: 60px;
}

:root[data-theme="dark"] {
  --bg: #000000;
  --fg: #f5f5f5;
  --fg-2: #a3a3a3;
  --fg-3: #737373;
  --border: #262626;
  --accent-bg: #ffffff;
  --accent-fg: #000000;
  --hover: #141414;
  --icon-border: rgba(255, 255, 255, 0.12);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

a {
  color: inherit;
}

button {
  font-family: inherit;
}

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

/* ---------- 头部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2px;
  color: var(--fg);
  text-decoration: none;
}

.brand-logo {
  flex: none;
  border-radius: 6px;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 44px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: none;
  cursor: pointer;
  font-size: 15px;
  color: var(--fg-2);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--fg);
  background: var(--hover);
}

.nav-link.active {
  color: var(--fg);
}

/* 主题切换与语言切换 */

.theme-icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-icon-moon {
  display: none;
}

.lang-switch {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* 汉堡按钮 */

.nav-burger {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 8px;
  background: none;
  color: var(--fg);
  cursor: pointer;
}

.nav-burger:hover {
  background: var(--hover);
}

/* ---------- 主体 ---------- */

.site-main {
  flex: 1;
  padding: 40px 0 64px;
}

/* ---------- 主页：标签筛选 ---------- */

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.chip {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: none;
  color: var(--fg-2);
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
}

.chip:hover {
  color: var(--fg);
  border-color: var(--fg-3);
}

.chip.active {
  background: var(--accent-bg);
  border-color: var(--accent-bg);
  color: var(--accent-fg);
}

/* ---------- 主页产品网格 ---------- */

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  color: var(--fg);
  text-decoration: none;
}

.product-card:hover {
  border-color: var(--fg-3);
}

.product-card img {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  border: 1px solid var(--icon-border);
}

.product-name {
  font-size: 15px;
  font-weight: 600;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.product-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-2);
}

.tag {
  display: inline-block;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 11px;
  line-height: 1;
  font-weight: 400;
  color: var(--fg-3);
}

.empty-tip {
  padding: 32px 0;
  font-size: 14px;
  color: var(--fg-3);
}

/* ---------- 返回链接 ---------- */

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--fg-3);
  text-decoration: none;
}

.back-link:hover {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 产品页 hero ---------- */

.product-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 0 8px;
  text-align: center;
}

.product-hero>img {
  width: 112px;
  height: 112px;
  margin-bottom: 20px;
  border-radius: 26px;
  border: 1px solid var(--icon-border);
}

.product-hero h1 {
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700;
  line-height: 1.25;
}

.hero-sub {
  margin-top: 8px;
  font-size: clamp(16px, 3vw, 20px);
  color: var(--fg-2);
}

.hero-tag {
  margin-top: 6px;
  font-size: 14px;
  color: var(--fg-3);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 28px;
  border-radius: 10px;
  background: var(--accent-bg);
  color: var(--accent-fg);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: none;
  color: var(--fg-2);
  font-size: 15px;
  text-decoration: none;
}

.btn-secondary:hover {
  color: var(--fg);
  border-color: var(--fg-3);
}

/* ---------- 特性网格 ---------- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px 24px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.feature-icon {
  font-size: 24px;
  line-height: 1;
}

.feature h2 {
  margin-top: 10px;
  font-size: 16px;
  font-weight: 600;
}

.feature p {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-2);
}

/* ---------- 文档页（法律 / 关于） ---------- */

.doc {
  width: 100%;
}

.doc h1 {
  margin-bottom: 24px;
  font-size: 28px;
  font-weight: 700;
}

.doc h2 {
  margin: 28px 0 8px;
  font-size: 18px;
  font-weight: 600;
}

.doc p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--fg-2);
}

.doc a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.doc blockquote {
  margin: 16px 0;
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--border);
  color: var(--fg-2);
}

.doc ul {
  list-style: none;
  margin-top: 12px;
}

.doc ul li {
  padding: 6px 0;
  font-size: 15px;
}

.doc ul a {
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}

.doc ul a:hover {
  border-bottom-color: var(--fg);
}

/* ---------- 关于页 ---------- */

.about {
  padding-top: 32px;
  text-align: center;
}

.about section+section {
  margin-top: 72px;
}

.about-avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 50%;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.about-hero h1 {
  font-size: clamp(32px, 7vw, 44px);
  font-weight: 700;
  letter-spacing: 2px;
}

/* 组内紧凑：姓名与自述贴近 */
.about-hero .about-copy {
  margin-top: 20px;
}

.about-copy {
  max-width: 560px;
  margin: 0 auto;
}

.about-copy p {
  font-size: 15px;
  line-height: 2.2;
  color: var(--fg-2);
}

.about h2 {
  margin: 0 0 20px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--fg-3);
}

/* 定价声明：全页唯一的反色焦点 */
.about-pricing {
  display: inline-block;
  padding: 12px 32px;
  background: var(--accent-bg);
  color: var(--accent-fg);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  max-width: 560px;
  margin: 0 auto;
}

.contact-grid a,
.contact-grid button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: none;
  color: var(--fg-2);
  font-size: 14px;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
}

.contact-grid a:hover,
.contact-grid button:hover {
  color: var(--fg);
  border-color: var(--fg-3);
}

/* ---------- 页脚 ---------- */

.site-footer {
  padding: 28px 0 36px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  text-align: center;
  font-size: 13px;
  color: var(--fg-3);
}

.footer-inner p+p {
  margin-top: 4px;
}

.footer-inner a {
  color: var(--fg-3);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--fg-2);
  text-decoration: underline;
}

/* ---------- 移动端 ---------- */

@media (max-width: 767px) {
  .container {
    padding: 0 16px;
  }

  .nav-burger {
    display: inline-flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 8px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }

  .site-header.menu-open .nav-menu {
    display: flex;
  }

  .nav-menu .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0 12px;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
  }

  .product-card {
    padding: 16px;
  }

  .site-main {
    padding: 24px 0 48px;
  }

  .features {
    gap: 24px;
    margin-top: 40px;
    padding-top: 32px;
  }
}