/* ========== 全局 ========== */
:root {
  --c1: #00d9a6;        /* 亮青绿 */
  --c2: #00b8d9;        /* 亮蓝青 */
  --c3: #009688;
  --grad: linear-gradient(135deg, #00e5b0 0%, #00c6a8 40%, #00b8d9 100%);
  --grad-soft: linear-gradient(135deg, rgba(0, 229, 176, .08), rgba(0, 184, 217, .08));
  --dark: #0e2f2b;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
  color: #23333b;
  background: #fff;
}

/* ========== 导航 ========== */
.navbar-custom {
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 12px rgba(0, 120, 100, .10);
}

.navbar-custom .navbar-brand {
  color: var(--dark);
  font-size: 1.15rem;
}

.navbar-custom .navbar-brand .bi {
  color: var(--c1);
}

.brand-en {
  color: var(--c3);
  font-size: .72rem;
  letter-spacing: .5px;
  margin-left: 6px;
}

.navbar-custom .nav-link {
  color: var(--dark);
  font-weight: 500;
}

.navbar-custom .nav-link:hover,
.navbar-custom .nav-link.active {
  color: var(--c3);
}

.btn-lang {
  border: 2px solid var(--c3);
  color: var(--c3);
  font-weight: 700;
  border-radius: 20px;
  padding: .25rem 1rem;
  min-width: 52px;
  transition: all .2s;
}

.btn-lang:hover,
.btn-lang.active {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
}

/* ========== Hero ========== */
.hero {
  min-height: 92vh;
  background: var(--grad);
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, .14);
}

.hero::before {
  width: 380px;
  height: 380px;
  top: -120px;
  right: -80px;
}

.hero::after {
  width: 260px;
  height: 260px;
  bottom: -90px;
  left: -60px;
}

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

.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  text-shadow: 0 2px 14px rgba(0, 80, 70, .25);
}

.hero-sub-line {
  font-size: clamp(1.1rem, 2.6vw, 1.7rem);
  font-weight: 500;
  opacity: .95;
}

.hero-desc {
  max-width: 640px;
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.hero .btn-light {
  color: var(--c3);
  border-radius: 30px;
  box-shadow: 0 6px 20px rgba(0, 80, 70, .22);
}

/* ========== 区块 ========== */
.section {
  padding: 84px 0;
}

.section-alt {
  background: var(--grad-soft);
}

.section-title {
  color: var(--dark);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
}

.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: var(--grad);
  margin: 12px auto 0;
}

.section-sub {
  letter-spacing: .5px;
}

/* ========== 简介 ========== */
.about-p {
  font-size: 1.05rem;
  line-height: 2;
  text-indent: 2em;
  margin-bottom: 1.1rem;
  text-align: justify;
}

/* ========== 业务卡片 ========== */
.service-card,
.contact-card {
  border: none;
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(0, 120, 100, .10);
  transition: transform .25s, box-shadow .25s;
}

.service-card:hover,
.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 34px rgba(0, 120, 100, .18);
}

.service-icon {
  font-size: 2.6rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ========== 联系卡片 ========== */
.contact-icon {
  font-size: 2rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.contact-link {
  color: var(--c3);
  text-decoration: none;
  word-break: break-word;
}

.contact-link:hover {
  color: var(--dark);
}

/* ========== 页脚 ========== */
.footer {
  background: var(--dark);
}

/* ========== 响应式微调 ========== */
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: #fff;
    border-radius: 12px;
    padding: 14px 18px;
    box-shadow: 0 10px 30px rgba(0, 80, 70, .12);
    margin-top: 10px;
  }
}

@media (max-width: 575.98px) {
  .section {
    padding: 64px 0;
  }

  .about-p {
    text-indent: 0;
    font-size: 1rem;
  }
}