/* ============================================================
   oniondata.tech — 洋葱数据 官网样式
   设计风格：品牌感卡片风
   ============================================================ */

/* ---------- 设计 Token ---------- */
:root {
  --color-bg: #1D2129;
  --color-card: #2A2F38;
  --color-primary: #3C7EFF;
  --color-primary-hover: #5B93FF;
  --color-title: #FFFFFF;
  --color-text: #C9CDD4;
  --color-aux: #86909C;
  --color-divider: #373C45;

  --radius-card: 8px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.4);

  --max-width: 1080px;

  --font-body: 14px/22px;
  --font-h1: 28px;
  --font-h2: 20px;
  --font-h3: 16px;

  --font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(60, 126, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(60, 126, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ---------- 布局 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 56px 0;
}

/* ---------- 顶部导航（sticky） ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #1D2129;
  border-bottom: 1px solid var(--color-divider);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  height: 44px;
}

.nav__logo img {
  height: 44px;
  width: auto;
}

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  font-size: 14px;
  color: var(--color-text);
  transition: color 0.2s ease;
}

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

/* ---------- 板块通用标题 ---------- */
.section-title {
  font-size: var(--font-h2);
  font-weight: 500;
  color: var(--color-title);
  margin-bottom: 24px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 80px 0 64px;
  text-align: center;
  overflow: hidden;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero__nodes {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero__title {
  font-size: var(--font-h1);
  font-weight: 600;
  color: var(--color-title);
  margin-bottom: 12px;
}

.hero__subtitle {
  font-size: 18px;
  line-height: 26px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero__desc {
  max-width: 640px;
  margin: 0 auto 32px;
  color: var(--color-aux);
}

.hero__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-card);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

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

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

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn--ghost:hover {
  background: rgba(60, 126, 255, 0.1);
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
}

/* ---------- 公司简介 ---------- */
.about__card {
  padding: 32px;
}

.about__text {
  font-size: 14px;
  line-height: 24px;
  color: var(--color-text);
  margin-bottom: 20px;
}

.about__tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(60, 126, 255, 0.15);
  color: var(--color-primary);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

/* ---------- 作品网格 ---------- */
.works__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.work-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.work-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.work-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(60, 126, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.work-card__name {
  font-size: var(--font-h3);
  font-weight: 500;
  color: var(--color-title);
  margin-bottom: 6px;
}

.work-card__platform {
  display: inline-block;
  align-self: flex-start;
  padding: 2px 10px;
  background: var(--color-bg);
  color: var(--color-aux);
  border-radius: 10px;
  font-size: 12px;
  margin-bottom: 10px;
}

.work-card__desc {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text);
  margin-bottom: 16px;
  flex: 1;
}

.work-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 500;
  transition: gap 0.2s ease;
}

.work-card__link:hover {
  gap: 8px;
}

/* ---------- 开发能力 ---------- */
.capability__card {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px 32px;
}

.capability__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #3C7EFF;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.capability__icon svg {
  width: 28px;
  height: 28px;
  fill: #fff;
}

.capability__body {
  flex: 1;
}

.capability__name {
  font-size: var(--font-h3);
  font-weight: 500;
  color: var(--color-title);
  margin-bottom: 4px;
}

.capability__desc {
  font-size: 13px;
  color: var(--color-aux);
  margin-bottom: 8px;
}

.capability__link {
  font-size: 13px;
  color: var(--color-primary);
  word-break: break-all;
}

.capability__link:hover {
  text-decoration: underline;
}

.capability__summary {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text);
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

/* ---------- 资质网格 ---------- */
.cert__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.cert-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  border-top: 3px solid var(--color-primary);
}

.cert-card__title {
  font-size: var(--font-h3);
  font-weight: 500;
  color: var(--color-title);
  margin-bottom: 8px;
}

.cert-card__org {
  font-size: 13px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.cert-card__detail {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text);
  word-break: break-all;
}

/* ---------- 联系方式 ---------- */
.contact__card {
  padding: 32px;
}

.contact__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  list-style: none;
}

.contact__item-label {
  font-size: 12px;
  color: var(--color-aux);
  margin-bottom: 4px;
}

.contact__item-value {
  font-size: 15px;
  color: var(--color-title);
  font-weight: 500;
}

.contact__item-value a:hover {
  color: var(--color-primary);
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--color-divider);
  background: #171A1F;
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--color-aux);
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  section {
    padding: 40px 0;
  }

  .nav__links {
    gap: 18px;
  }

  .nav__links a {
    font-size: 13px;
  }

  .hero {
    padding: 56px 0 40px;
  }

  .hero__title {
    font-size: 24px;
  }

  .hero__subtitle {
    font-size: 16px;
  }

  .about__card,
  .contact__card {
    padding: 24px;
  }

  .capability__card {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}

/* 作品卡片真实图标：填满圆形 */
img.work-card__icon {
  object-fit: cover;
  background: var(--color-bg);
  padding: 0;
}

/* ---------- 板块副标题 ---------- */
.section-subtitle {
  font-size: 14px;
  color: var(--color-aux);
  margin-top: -16px;
  margin-bottom: 24px;
}

/* ---------- 服务卡片 ---------- */
.service__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(60, 126, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.service-card__name {
  font-size: var(--font-h3);
  font-weight: 500;
  color: var(--color-title);
  margin-bottom: 6px;
}

.service-card__desc {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text);
  flex: 1;
}

.service__platforms {
  margin-top: 24px;
  font-size: 13px;
  color: var(--color-aux);
  text-align: center;
  padding: 12px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-card);
}

/* ---------- 案例卡片字段 ---------- */
.case-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.case-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.case-card__fields {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
  flex: 1;
}

.case-card__field {
  display: flex;
  gap: 8px;
  font-size: 13px;
  line-height: 20px;
}

.case-card__field-label {
  color: var(--color-aux);
  flex-shrink: 0;
  min-width: 32px;
}

.case-card__field-value {
  color: var(--color-text);
}

/* ---------- 为什么 tagline ---------- */
.why__tagline {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-text);
  text-align: center;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

/* 案例场景前置 */
.case-card__scene {
  margin: 6px 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}