/* ============================================
   海南树元科技官网 - 科技风扁平化设计
   主色：深蓝 + 青绿（海南地域 + 科技属性）
   ============================================ */

:root {
  --color-bg: #0a0f1a;
  --color-surface: #111827;
  --color-surface-light: #1f2937;
  --color-primary: #06b6d4;
  --color-primary-light: #22d3ee;
  --color-accent: #10b981;
  --color-accent-light: #34d399;
  --color-text: #f9fafb;
  --color-text-muted: #9ca3af;
  --color-border: #374151;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  margin: 0;
  overflow-x: hidden;
}

/* 导航栏 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1030;
  background: rgba(10, 15, 26, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(55, 65, 81, 0.5);
  transition: background 0.3s ease;
}

.site-header .navbar {
  padding: 0.75rem 0;
}

.site-header .navbar-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text) !important;
}

.site-header .navbar-brand i {
  color: var(--color-primary);
}

.site-header .nav-link {
  color: var(--color-text-muted) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  transition: color 0.2s ease;
}

.site-header .nav-link:hover {
  color: var(--color-primary) !important;
}

.site-header .navbar-toggler {
  border-color: var(--color-border);
}

.site-header .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28156, 163, 175, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* CTA 按钮 */
.btn-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff !important;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border: none;
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.35);
  color: #fff !important;
}

/* Hero 区 */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, #0a0f1a 0%, #0f172a 30%, #0c4a6e 70%, #065f46 100%);
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.12) 0%, transparent 40%),
    linear-gradient(180deg, transparent 60%, rgba(10, 15, 26, 0.8) 100%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.min-vh-75 {
  min-height: 75vh;
}

.hero-tagline {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.1em;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 600;
  color: var(--color-primary-light);
}

.hero-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.btn-hero {
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

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

.btn-hero.btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-hero.btn-outline-light {
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn-hero.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
  color: #fff;
}

.btn-hero.btn-accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.btn-hero.btn-accent:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

/* 通用区块 */
.section {
  padding: 5rem 0;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
}

/* 核心优势区 */
.advantages {
  background: var(--color-surface);
}

.advantage-card {
  background: var(--color-surface-light);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
  height: 100%;
}

.advantage-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}

.advantage-card.highlight {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.08) 0%, var(--color-surface-light) 100%);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
}

.advantage-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.advantage-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* 业务入口区 */
.business {
  background: var(--color-bg);
}

.business-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.2s ease;
  height: 100%;
}

.business-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.business-card i {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
  display: block;
}

.business-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.business-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.business-card.featured {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.06) 0%, var(--color-surface) 100%);
}

.business-card.featured i {
  color: var(--color-accent-light);
}

.business-card-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}

.more-text {
  color: var(--color-text-muted);
  font-size: 1rem;
}

.business-card-empty:hover .more-text {
  color: var(--color-primary);
}

/* 案例轮播 */
.cases {
  background: var(--color-surface);
}

.case-swiper {
  padding: 1rem 0 3rem;
}

.case-card {
  background: var(--color-surface-light);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s;
}

.case-card:hover {
  transform: translateY(-4px);
}

.case-img {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-img i {
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.9);
}

.case-body {
  padding: 1.5rem;
}

.case-body h5 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.case-body p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* Swiper 自定义 */
.swiper-button-prev,
.swiper-button-next {
  color: var(--color-primary) !important;
}

.swiper-pagination-bullet {
  background: var(--color-text-muted) !important;
  opacity: 0.5;
}

.swiper-pagination-bullet-active {
  background: var(--color-primary) !important;
  opacity: 1;
}

/* CTA 区块 */
.cta-section {
  background: var(--color-bg);
}

.cta-card {
  background: linear-gradient(135deg, var(--color-surface-light) 0%, var(--color-surface) 100%);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3rem;
}

.cta-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

/* 页脚 */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.site-footer .footer-brand {
  font-weight: 700;
  color: var(--color-text);
}

.site-footer .footer-brand i {
  color: var(--color-primary);
}

.site-footer h6 {
  color: var(--color-text);
  font-size: 0.9rem;
}

.fw-600 {
  font-weight: 600;
}

.site-footer ul a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.site-footer ul a:hover {
  color: var(--color-primary);
}

.site-footer .border-secondary {
  border-color: var(--color-border) !important;
}

/* 覆盖 Bootstrap 默认 */
.text-muted {
  color: var(--color-text-muted) !important;
}

/* ===== 内页通用 ===== */
.page-hero {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  padding: 8rem 0 4rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.page-content {
  background: var(--color-bg);
}

.content-block h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

.content-block .lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
}

.info-card .info-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.info-card .info-value {
  font-weight: 600;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--color-primary);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  transform: translateX(-50%);
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.timeline-content h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.timeline-content p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0;
}

.team-feature {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

.team-feature i {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.team-feature h5 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.team-feature p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* 核心业务页 */
.tech-tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.tech-tag i {
  color: var(--color-primary);
  margin-right: 0.5rem;
}

.flow-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  height: 100%;
}

.flow-num {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  text-align: center;
  line-height: 2rem;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.flow-step h6 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.flow-step p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin: 0;
}

.value-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.value-card i {
  color: var(--color-primary);
  font-size: 1.5rem;
}

/* 案例详情页 */
.case-detail-header {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.case-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: #fff;
  flex-shrink: 0;
}

.case-point {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  height: 100%;
}

.case-point h6 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.case-point p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tech-stack span {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.tech-stack i {
  margin-right: 0.5rem;
  color: var(--color-primary);
}

/* 解决方案页 */
.solution-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  height: 100%;
  transition: border-color 0.2s;
}

.solution-card:hover {
  border-color: var(--color-primary);
}

.solution-card.cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.solution-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 1.25rem;
}

.solution-card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.solution-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* 合作伙伴页 */
.partner-card {
  display: flex;
  align-items: center;
  gap: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem;
}

.partner-logo {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: #fff;
}

.industry-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  transition: border-color 0.2s;
}

.industry-card:hover {
  border-color: var(--color-primary);
}

.industry-card i {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.industry-card h5 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.industry-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.eco-card {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-light) 100%);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
}

.eco-card i {
  font-size: 3rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.eco-card h4 {
  margin-bottom: 1rem;
}

.eco-card p {
  color: var(--color-text-muted);
  margin: 0;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* 联系我们页 */
.contact-form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2.5rem;
}

.form-control-dark {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.form-control-dark:focus {
  background: var(--color-bg);
  border-color: var(--color-primary);
  color: var(--color-text);
  box-shadow: 0 0 0 0.2rem rgba(6, 182, 212, 0.25);
}

.form-control-dark::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--color-accent);
  color: var(--color-accent-light);
}