/* 
 * 山岳科技 - 企业官网样式
 * 设计理念：稳健如山，高远如岳
 */

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

:root {
  /* 配色方案 */
  --color-mountain: #1a1f23;      /* 深墨灰 */
  --color-mist: #5b7c99;          /* 雾青色 */
  --color-snow: #f8f9fa;          /* 雪白 */
  --color-stone: #3d454d;         /* 石灰 */
  --color-text-muted: #6b7785;    /* 文字灰 */
  --color-accent: #4a6b8a;        /* 强调色 */

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  
  /* 字号 */
  --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: 2.5rem;

  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-snow);
  color: var(--color-mountain);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ===== 主视觉区域 ===== */
.hero {
  padding: var(--space-2xl) 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 55vh;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse at 30% 20%, rgba(91, 124, 153, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(91, 124, 153, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

/* Logo 图标 */
.logo-mark {
  margin-bottom: var(--space-md);
  display: flex;
  justify-content: center;
}

.mountain-icon {
  width: 80px;
  height: 80px;
  color: var(--color-mist);
  opacity: 0.9;
}

/* 公司名称 */
.company-name {
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-mountain);
  margin-bottom: var(--space-xs);
}

.company-full-name {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-md);
}

/* 定位语 */
.tagline {
  font-size: var(--text-lg);
  color: var(--color-mist);
  letter-spacing: 0.25em;
  font-weight: 400;
}

/* ===== 通用区块 ===== */
.section {
  padding: var(--space-xl) 0;
  border-top: 1px solid rgba(91, 124, 153, 0.12);
}

.section-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-mist);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
}

/* ===== 深耕领域 ===== */
.expertise-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  width: 100%;
}

.expertise-cards > * {
  flex: 1 1 calc(33.333% - 1rem);
  min-width: 280px;
}

.expertise-details {
  margin-top: 1.5rem;
  width: 100%;
}

.expertise-card {
  padding: 2.5rem;
  background: white;
  border: 1px solid rgba(91, 124, 153, 0.1);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  min-width: 0;
}

.expertise-card:hover {
  border-color: rgba(91, 124, 153, 0.3);
  box-shadow: 0 4px 20px rgba(91, 124, 153, 0.08);
}

.expertise-card.active {
  border-color: var(--color-mist);
  box-shadow: 0 6px 24px rgba(91, 124, 153, 0.12);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-sm);
  color: var(--color-mist);
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-mountain);
  margin-bottom: var(--space-xs);
  letter-spacing: 0.05em;
}

.card-desc {
  font-size: var(--text-sm);
  color: var(--color-stone);
  line-height: 1.8;
  margin-bottom: var(--space-sm);
}

/* 展开图标 */
.card-expand-icon {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  width: 24px;
  height: 24px;
  color: var(--color-text-muted);
  transition: var(--transition);
  opacity: 0.6;
}

.card-expand-icon svg {
  width: 100%;
  height: 100%;
}

.card-expand-icon.rotated {
  transform: rotate(180deg);
}

.expertise-card:hover .card-expand-icon {
  opacity: 1;
}

/* 详情面板 */
.card-detail {
  display: none;
}

.card-detail.expanded {
  display: block;
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(91, 124, 153, 0.02) 0%, rgba(91, 124, 153, 0.04) 100%);
  border-radius: 4px;
}

.detail-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.detail-section {
  display: flex;
  flex-direction: column;
}

.detail-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-mist);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(91, 124, 153, 0.15);
}

.detail-text {
  font-size: var(--text-sm);
  color: var(--color-stone);
  line-height: 1.9;
}

.detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.detail-list li {
  font-size: var(--text-sm);
  color: var(--color-stone);
  padding-left: var(--space-md);
  position: relative;
  line-height: 1.7;
}

.detail-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 4px;
  height: 4px;
  background: var(--color-mist);
  border-radius: 50%;
  opacity: 0.6;
}

/* ===== 技术栈 ===== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.tech-item {
  padding: var(--space-md);
  background: linear-gradient(135deg, rgba(91, 124, 153, 0.03) 0%, rgba(91, 124, 153, 0.06) 100%);
  border-left: 2px solid var(--color-mist);
  transition: var(--transition);
}

.tech-item:hover {
  background: linear-gradient(135deg, rgba(91, 124, 153, 0.05) 0%, rgba(91, 124, 153, 0.08) 100%);
}

.tech-name {
  display: block;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-mountain);
  margin-bottom: var(--space-xs);
}

.tech-desc {
  font-size: var(--text-sm);
  color: var(--color-stone);
  letter-spacing: 0.02em;
}

/* ===== 技术展望 ===== */
.vision-content {
  max-width: 700px;
}

.vision-quote {
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  background: white;
  border-left: 3px solid var(--color-mist);
  position: relative;
}

.vision-quote::before {
  content: '"';
  position: absolute;
  top: var(--space-sm);
  left: var(--space-md);
  font-size: 3rem;
  color: var(--color-mist);
  opacity: 0.2;
  line-height: 1;
}

.quote-text {
  font-size: var(--text-lg);
  color: var(--color-stone);
  font-style: italic;
  padding-left: var(--space-xl);
  line-height: 1.8;
}

.vision-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.point-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.point-marker {
  width: 6px;
  height: 6px;
  background: var(--color-mist);
  border-radius: 50%;
  margin-top: 0.6rem;
  flex-shrink: 0;
}

.point-text {
  font-size: var(--text-base);
  color: var(--color-stone);
  line-height: 1.8;
}

/* ===== 关于我们 ===== */
.about-content {
  max-width: 700px;
}

.about-text {
  font-size: var(--text-base);
  color: var(--color-stone);
  line-height: 2;
  margin-bottom: var(--space-md);
}

.about-text:last-child {
  margin-bottom: 0;
}

/* ===== 联系方式 ===== */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact-item {
  display: flex;
  gap: var(--space-lg);
  align-items: baseline;
}

.contact-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  min-width: 80px;
  flex-shrink: 0;
}

.contact-value {
  font-size: var(--text-base);
  color: var(--color-mountain);
  text-decoration: none;
  transition: var(--transition);
}

a.contact-value:hover {
  color: var(--color-mist);
}

/* ===== 页脚 ===== */
.footer {
  margin-top: auto;
  padding: var(--space-lg) 0;
  border-top: 1px solid rgba(91, 124, 153, 0.12);
  position: relative;
}

.footer-decoration {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-mist), transparent);
  opacity: 0.3;
}

.footer-content {
  text-align: center;
}

.copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.icp {
  font-size: var(--text-xs);
}

.icp a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.icp a:hover {
  color: var(--color-mist);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  :root {
    --text-3xl: 2rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    min-height: 50vh;
    padding: var(--space-xl) 0;
  }

  .expertise-cards {
    flex-direction: column;
    gap: 1rem;
  }

  .expertise-cards > * {
    flex: 1 1 100%;
    min-width: auto;
  }

  .detail-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .tech-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .contact-item {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .contact-label {
    min-width: auto;
  }

  .tagline {
    letter-spacing: 0.15em;
  }
}

@media (max-width: 480px) {
  :root {
    --text-3xl: 1.75rem;
  }

  .company-name {
    letter-spacing: 0.1em;
  }
}

/* ===== 大屏幕优化 ===== */
@media (min-width: 1200px) {
  :root {
    --text-3xl: 3rem;
  }

  .container {
    max-width: 1100px;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .hero {
    min-height: auto;
    padding: var(--space-lg) 0;
  }
  
  .section {
    page-break-inside: avoid;
  }

  .hero-bg {
    display: none;
  }
}