/* ============================================================
   科斯力达 KSILDA 企业官网 · 全站样式
   风格：简约大气 | 主色：品牌深青 + 生机绿
   ============================================================ */
:root {
  --primary: #0e5f6e;        /* 品牌深青 */
  --primary-dark: #0a4652;
  --primary-light: #e8f3f5;
  --accent: #3fa845;         /* 生机绿 */
  --accent-light: #eaf6eb;
  --gold: #c9a24b;
  --text: #2c3e40;
  --text-light: #6b7c7e;
  --bg: #ffffff;
  --bg-soft: #f6f9f9;
  --line: #e3ebeb;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(14, 95, 110, .10);
  --shadow-hover: 0 16px 40px rgba(14, 95, 110, .18);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { width: min(1160px, 92%); margin: 0 auto; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand img { height: 48px; width: auto; }
.brand .brand-sub {
  height: 40px; padding-left: 14px;
  border-left: 1px solid var(--line);
}
.main-nav { display: flex; gap: 8px; align-items: center; }
.main-nav a {
  padding: 10px 22px;
  font-size: 16px; font-weight: 600;
  color: var(--text-light);
  border-radius: 999px;
  transition: all .25s ease;
  position: relative;
}
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active { color: #fff; background: var(--primary); }
.header-phone {
  display: flex; align-items: center; gap: 10px;
  color: var(--primary); font-weight: 700; font-size: 17px;
  padding-left: 20px; border-left: 1px solid var(--line); margin-left: 12px;
}
.header-phone .icon {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
}

/* 移动端菜单按钮 */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--primary); margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ---------------- 页面横幅 ---------------- */
.page-banner {
  background: linear-gradient(120deg, var(--primary-dark) 0%, var(--primary) 55%, #17899b 100%);
  color: #fff; text-align: center;
  padding: 88px 0 84px;
  position: relative; overflow: hidden;
}
.page-banner::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255,255,255,.08) 0 160px, transparent 160px),
    radial-gradient(circle at 12% 85%, rgba(255,255,255,.06) 0 120px, transparent 120px);
}
.page-banner h1 { font-size: 40px; letter-spacing: 6px; font-weight: 700; position: relative; }
.page-banner p { margin-top: 14px; font-size: 16px; opacity: .85; letter-spacing: 2px; position: relative; }

/* ---------------- 通用区块 ---------------- */
.section { padding: 90px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .kicker {
  display: inline-block; font-size: 13px; letter-spacing: 4px;
  color: var(--accent); font-weight: 700; margin-bottom: 10px;
}
.section-head h2 { font-size: 32px; color: var(--primary-dark); letter-spacing: 2px; }
.section-head .bar {
  width: 56px; height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  margin: 18px auto 0;
}
.section-head .lead { margin-top: 18px; color: var(--text-light); font-size: 16px; }

.btn {
  display: inline-block; padding: 14px 38px;
  border-radius: 999px; font-size: 16px; font-weight: 600;
  transition: all .25s ease; cursor: pointer; border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-ghost { border: 2px solid rgba(255,255,255,.75); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.14); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative; color: #fff;
  background:
    linear-gradient(100deg, rgba(8, 58, 68, .88) 0%, rgba(10, 70, 82, .62) 42%, rgba(10, 70, 82, .18) 100%),
    url("../assets/hero.png") center 42% / cover no-repeat;
}
.hero-inner { padding: 150px 0 160px; max-width: 640px; }
.hero .tag {
  display: inline-block; font-size: 14px; letter-spacing: 5px;
  border: 1px solid rgba(255,255,255,.5); border-radius: 999px;
  padding: 6px 18px; margin-bottom: 26px; opacity: .95;
}
.hero h1 { font-size: 46px; line-height: 1.35; letter-spacing: 3px; font-weight: 700; }
.hero h1 em { font-style: normal; color: #9fd8a8; }
.hero p { margin-top: 22px; font-size: 17px; opacity: .9; max-width: 520px; }
.hero .actions { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------------- 数据条 ---------------- */
.stats { background: var(--primary); color: #fff; padding: 42px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stats .num { font-size: 34px; font-weight: 800; letter-spacing: 1px; }
.stats .num span { font-size: 16px; font-weight: 600; margin-left: 4px; opacity: .85; }
.stats .label { margin-top: 6px; font-size: 14px; opacity: .8; letter-spacing: 2px; }

/* ---------------- 产品系列卡片 ---------------- */
.series-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.series-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 40px 30px 34px; text-align: center;
  transition: all .3s ease; position: relative; overflow: hidden;
}
.series-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  transform: scaleX(0); transform-origin: left; transition: .35s ease;
}
.series-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: transparent; }
.series-card:hover::before { transform: scaleX(1); }
.series-card .icon {
  width: 72px; height: 72px; margin: 0 auto 22px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 30px; color: #fff;
  background: linear-gradient(135deg, var(--primary), #1d8496);
  box-shadow: var(--shadow);
}
.series-card:nth-child(2) .icon { background: linear-gradient(135deg, #2e7d32, var(--accent)); }
.series-card:nth-child(3) .icon { background: linear-gradient(135deg, var(--gold), #e0bc6e); }
.series-card:nth-child(4) .icon { background: linear-gradient(135deg, #d9752b, #f0a04b); }
.series-card h3 { font-size: 21px; color: var(--primary-dark); letter-spacing: 1px; }
.series-card .en { font-size: 12px; color: var(--text-light); letter-spacing: 1px; margin-top: 4px; }
.series-card p { margin-top: 16px; font-size: 14.5px; color: var(--text-light); }
.series-card .more {
  display: inline-block; margin-top: 20px; font-size: 14px; font-weight: 600; color: var(--primary);
}
.series-card .more:hover { color: var(--accent); }

/* ---------------- 理念三联 ---------------- */
.concept-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.concept {
  background: linear-gradient(160deg, var(--primary-light), #f8fcfc);
  border-radius: var(--radius); padding: 42px 34px;
  border: 1px solid var(--line); transition: .3s;
}
.concept:hover { box-shadow: var(--shadow); transform: translateY(-6px); }
.concept .num { font-size: 15px; font-weight: 800; color: var(--accent); letter-spacing: 2px; }
.concept h3 { margin-top: 12px; font-size: 22px; color: var(--primary-dark); }
.concept p { margin-top: 14px; font-size: 15px; color: var(--text-light); }

/* ---------------- 优势列表 ---------------- */
.adv-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.adv-photo { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.adv-list li { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px dashed var(--line); }
.adv-list li:last-child { border-bottom: none; }
.adv-list .idx {
  flex: 0 0 44px; height: 44px; border-radius: 12px;
  background: var(--primary-light); color: var(--primary);
  font-weight: 800; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
}
.adv-list h4 { font-size: 17.5px; color: var(--primary-dark); }
.adv-list p { margin-top: 4px; font-size: 14.5px; color: var(--text-light); }

/* ---------------- 关于页 ---------------- */
.about-intro { display: grid; grid-template-columns: 1.15fr .85fr; gap: 54px; align-items: center; }
.about-intro img { border-radius: var(--radius); box-shadow: var(--shadow); }
.about-intro h3 { font-size: 26px; color: var(--primary-dark); margin-bottom: 18px; }
.about-intro p { font-size: 15.5px; color: var(--text-light); text-align: justify; margin-bottom: 14px; }
.about-intro .motto {
  margin-top: 20px; padding: 16px 22px;
  background: var(--accent-light); border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0; color: var(--primary-dark); font-weight: 600;
}

.timeline { position: relative; max-width: 860px; margin: 0 auto; }
.timeline::before {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0;
  width: 2px; background: var(--line); transform: translateX(-50%);
}
.tl-item { position: relative; width: 50%; padding: 0 44px 44px; }
.tl-item:nth-child(odd) { left: 0; text-align: right; }
.tl-item:nth-child(even) { left: 50%; }
.tl-item::before {
  content: ""; position: absolute; top: 8px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 3px solid #fff; box-shadow: 0 0 0 3px var(--accent);
}
.tl-item:nth-child(odd)::before { right: -7px; }
.tl-item:nth-child(even)::before { left: -7px; }
.tl-item .year { font-size: 20px; font-weight: 800; color: var(--primary); }
.tl-item h4 { margin-top: 6px; font-size: 16.5px; color: var(--primary-dark); }
.tl-item p { margin-top: 6px; font-size: 14px; color: var(--text-light); }

.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.value-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px; text-align: center; transition: .3s;
}
.value-card:hover { box-shadow: var(--shadow); transform: translateY(-6px); }
.value-card .zi {
  width: 64px; height: 64px; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), #1d8496);
  color: #fff; font-size: 26px; font-weight: 700; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
}
.value-card h4 { color: var(--primary-dark); font-size: 17px; }
.value-card p { margin-top: 10px; font-size: 13.5px; color: var(--text-light); }

/* ---------------- 产品页 ---------------- */
.series-block { margin-bottom: 72px; }
.series-block:last-child { margin-bottom: 0; }
.series-title {
  display: flex; align-items: center; gap: 16px; margin-bottom: 30px;
}
.series-title .badge {
  padding: 8px 20px; border-radius: 999px; color: #fff;
  font-size: 16px; font-weight: 700; letter-spacing: 2px;
  background: linear-gradient(90deg, var(--primary), #1d8496);
}
.series-block.green .series-title .badge { background: linear-gradient(90deg, #2e7d32, var(--accent)); }
.series-block.gold .series-title .badge { background: linear-gradient(90deg, #b8862f, #dcb15f); }
.series-block.orange .series-title .badge { background: linear-gradient(90deg, #d9752b, #f0a04b); }
.series-title .en { font-size: 13px; color: var(--text-light); letter-spacing: 1px; }

.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 26px 24px; transition: .3s;
}
.product-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: transparent; }
.product-card h4 { font-size: 17px; color: var(--primary-dark); display: flex; align-items: center; gap: 8px; }
.product-card h4::before {
  content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--accent); flex: 0 0 auto;
}
.product-card .comp { margin-top: 8px; font-size: 13px; color: var(--gold); font-weight: 600; }
.product-card p { margin-top: 8px; font-size: 13.8px; color: var(--text-light); }

.defense-note {
  margin-top: 60px; padding: 34px 38px;
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; border-radius: var(--radius);
  display: flex; align-items: center; gap: 30px; justify-content: space-between; flex-wrap: wrap;
}
.defense-note h3 { font-size: 22px; letter-spacing: 2px; }
.defense-note p { margin-top: 8px; opacity: .85; font-size: 15px; max-width: 640px; }
.defense-note .btn { background: #fff; color: var(--primary); flex: 0 0 auto; }

/* ---------------- 联系页 ---------------- */
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 50px; }
.contact-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 40px 36px; box-shadow: var(--shadow);
}
.contact-item { display: flex; gap: 18px; padding: 18px 0; border-bottom: 1px dashed var(--line); }
.contact-item:last-child { border-bottom: none; }
.contact-item .ci {
  flex: 0 0 46px; height: 46px; border-radius: 50%;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 19px;
}
.contact-item h4 { font-size: 15.5px; color: var(--primary-dark); }
.contact-item p { margin-top: 4px; font-size: 15px; color: var(--text-light); }
.contact-item p strong { color: var(--primary); font-size: 18px; letter-spacing: 1px; }

.form-card {
  background: linear-gradient(160deg, var(--primary-light), #fbfdfd);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 36px;
}
.form-card h3 { font-size: 22px; color: var(--primary-dark); }
.form-card .sub { margin-top: 6px; font-size: 14px; color: var(--text-light); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.form-field { display: flex; flex-direction: column; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13.5px; font-weight: 600; color: var(--primary-dark); margin-bottom: 8px; }
.form-field input, .form-field textarea {
  border: 1.5px solid var(--line); border-radius: 10px; padding: 13px 15px;
  font-size: 15px; font-family: inherit; color: var(--text); background: #fff;
  transition: border-color .2s; resize: vertical;
}
.form-field input:focus, .form-field textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14, 95, 110, .10);
}
.form-card .btn { margin-top: 26px; width: 100%; }
.form-tip {
  display: none; margin-top: 18px; padding: 12px 16px;
  background: var(--accent-light); color: #2e7d32; border-radius: 10px;
  font-size: 14px; text-align: center;
}
.form-tip.show { display: block; }

/* ---------------- 底部 ---------------- */
.cta-band {
  background:
    linear-gradient(100deg, rgba(8,58,68,.90), rgba(14,95,110,.72)),
    url("../assets/hero.png") center 60% / cover no-repeat;
  color: #fff; text-align: center; padding: 84px 0;
}
.cta-band h2 { font-size: 32px; letter-spacing: 3px; }
.cta-band p { margin-top: 14px; opacity: .85; font-size: 16px; }
.cta-band .btn { margin-top: 32px; }

.site-footer { background: #0b3c46; color: rgba(255,255,255,.78); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 46px; }
.footer-grid .brand img { height: 42px; background: #fff; border-radius: 8px; padding: 6px; }
.footer-grid p { font-size: 14px; margin-top: 16px; }
.footer-grid h4 { color: #fff; font-size: 16px; margin-bottom: 18px; letter-spacing: 1px; }
.footer-grid li { margin-bottom: 11px; font-size: 14px; }
.footer-grid a:hover { color: #9fd8a8; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,.5);
}

/* ---------------- 动画 ---------------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .series-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .adv-grid, .about-intro { grid-template-columns: 1fr; gap: 36px; }
  .concept-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .brand .brand-sub { display: none; }
  .main-nav {
    position: fixed; top: 76px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(0,0,0,.08);
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { width: 100%; text-align: center; }
  .header-phone { display: none; }
  .nav-toggle { display: block; }
  .hero-inner { padding: 100px 0 110px; }
  .hero h1 { font-size: 32px; }
  .page-banner h1 { font-size: 30px; }
  .section { padding: 64px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .product-grid { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .timeline::before { left: 8px; }
  .tl-item { width: 100%; left: 0 !important; text-align: left !important; padding: 0 0 40px 40px; }
  .tl-item::before { left: 1px !important; right: auto !important; }
  .form-row { grid-template-columns: 1fr; }
}