/**
 * 广州源起之光信息科技有限公司官网样式
 * 风格：深蓝科技风，蓝紫渐变 + 金色点缀
 * 结构：基础变量 → 通用布局 → 导航 → Hero → 各板块 → 页脚 → 响应式
 */

/* ===== 基础变量与重置 ===== */
:root {
  --color-bg: #0b1e3f;          /* 主背景深蓝 */
  --color-bg-alt: #102952;      /* 交替板块背景 */
  --color-accent: #4f8cff;      /* 科技蓝 */
  --color-accent-2: #9b6bff;    /* 渐变紫 */
  --color-gold: #f0c060;        /* 点缀金 */
  --color-text: #e8eefc;        /* 主文字 */
  --color-text-dim: #9db1d8;    /* 次要文字 */
  --radius: 12px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth; /* 锚点平滑滚动（JS 之外的兜底） */
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(11, 30, 63, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(79, 140, 255, 0.15);
}

.nav-inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--color-text-dim);
  font-size: 15px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-gold);
}

/* 汉堡按钮：桌面端隐藏 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s, opacity 0.3s;
}

/* ===== Hero 首屏 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0b1e3f 0%, #16336b 55%, #2a1e63 100%);
}

/* 光晕装饰：营造"源起之光"的光感 */
.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(79, 140, 255, 0.35), transparent 65%);
  filter: blur(40px);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  width: 100%;
}

.hero h1 {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(90deg, #ffffff, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.slogan {
  margin-top: 16px;
  font-size: 22px;
  color: var(--color-gold);
  letter-spacing: 8px;
}

.hero-desc {
  margin: 20px auto 0;
  max-width: 560px;
  color: var(--color-text-dim);
  font-size: 17px;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 32px;
  border-radius: 999px;
  font-size: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  color: #fff;
  box-shadow: 0 8px 24px rgba(79, 140, 255, 0.4);
}

.btn-ghost {
  border: 1px solid rgba(232, 238, 252, 0.4);
  color: var(--color-text);
}

/* ===== 通用板块 ===== */
.section {
  padding: 96px 0;
}

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

.section-title {
  text-align: center;
  font-size: 32px;
  letter-spacing: 4px;
  margin-bottom: 56px;
  position: relative;
}

/* 标题下方金色短划线，增强板块辨识度 */
.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin: 14px auto 0;
  background: var(--color-gold);
  border-radius: 2px;
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p + p {
  margin-top: 16px;
}

.about-text p {
  color: var(--color-text-dim);
}

.about-stats {
  display: grid;
  gap: 16px;
}

.stat-item {
  background: rgba(79, 140, 255, 0.08);
  border: 1px solid rgba(79, 140, 255, 0.2);
  border-radius: var(--radius);
  padding: 20px 28px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.stat-item strong {
  font-size: 26px;
  color: var(--color-gold);
}

.stat-item span {
  color: var(--color-text-dim);
}

/* ===== 业务服务卡片 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: rgba(11, 30, 63, 0.6);
  border: 1px solid rgba(79, 140, 255, 0.18);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: transform 0.25s, border-color 0.25s;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
}

.card-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.card p {
  color: var(--color-text-dim);
  font-size: 14px;
}

/* ===== 核心优势 ===== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.adv-item {
  border-left: 3px solid var(--color-gold);
  padding-left: 24px;
}

.adv-item h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.adv-item p {
  color: var(--color-text-dim);
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
}

.contact-item {
  padding: 32px 16px;
  border-radius: var(--radius);
  background: rgba(11, 30, 63, 0.5);
}

.contact-item h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

.contact-item p {
  color: var(--color-text-dim);
}

/* ===== 页脚 ===== */
.footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid rgba(79, 140, 255, 0.15);
  color: var(--color-text-dim);
  font-size: 14px;
}

.footer p + p {
  margin-top: 6px;
}

.icp-link {
  color: var(--color-text-dim);
}

.icp-link:hover {
  color: var(--color-accent);
}

/* ===== 滚动淡入动画（配合 main.js 的 IntersectionObserver） ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===== 响应式：平板 ===== */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 34px;
  }
}

/* ===== 响应式：手机 ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  /* 移动端导航：默认隐藏，展开时竖排全宽 */
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid rgba(79, 140, 255, 0.2);
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 14px 24px;
    border-top: 1px solid rgba(79, 140, 255, 0.1);
  }

  .hero h1 {
    font-size: 26px;
    letter-spacing: 2px;
  }

  .slogan {
    font-size: 17px;
    letter-spacing: 4px;
  }

  .section {
    padding: 64px 0;
  }

  .about-grid,
  .adv-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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