/* ==========================================================================
   思科泰智建站 skiltechurl.com - 全站主样式表
   风格：韩系温柔风（奶蓝 + 米白 + 浅杏）
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：奶蓝系（柔和天空蓝、清透科技感） */
  --blue-50:  #F0F6FA;
  --blue-100: #E3EFF7;
  --blue-200: #CDE2F0;
  --blue-300: #A8CDE4;
  --blue-400: #7FB3D5;
  --blue-500: #5A9BC4;
  --blue-600: #4A85AD;
  --blue-700: #3D6E8F;
  --blue-800: #335A75;
  --blue-900: #2B4A60;

  /* 辅色：米白系（温暖底色、柔和纸张感） */
  --cream-50:  #FDFCF9;
  --cream-100: #FAF7F2;
  --cream-200: #F5F0E8;
  --cream-300: #EDE6DA;
  --cream-400: #E0D6C4;
  --cream-500: #D1C4A8;
  --cream-600: #BBAE8E;
  --cream-700: #9E9070;
  --cream-800: #7D7055;
  --cream-900: #5C5240;

  /* 强调色：浅杏系（温暖点缀、柔和活力） */
  --apricot-50:  #FEF6F0;
  --apricot-100: #FDEBDD;
  --apricot-200: #FAD4B8;
  --apricot-300: #F5B88A;
  --apricot-400: #EE9A5E;
  --apricot-500: #E87F3A;
  --apricot-600: #D46828;
  --apricot-700: #B05320;
  --apricot-800: #8C421C;
  --apricot-900: #6B3316;

  /* 功能色 */
  --text-primary: #2B3A4A;
  --text-secondary: #5A6B7A;
  --text-muted: #8A9AAA;
  --border-light: #E3EAF0;
  --border-medium: #C8D5E0;

  /* 圆角 */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;

  /* 阴影 */
  --shadow-xs: 0 1px 4px rgba(43, 74, 96, 0.06);
  --shadow-sm: 0 2px 12px rgba(43, 74, 96, 0.08);
  --shadow: 0 8px 30px rgba(43, 74, 96, 0.10);
  --shadow-lg: 0 16px 48px rgba(43, 74, 96, 0.14);
  --shadow-xl: 0 24px 64px rgba(43, 74, 96, 0.18);

  /* 布局 */
  --container: 1240px;
  --container-wide: 1400px;
  --container-narrow: 860px;
  --header-height: 72px;

  /* 动画 */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition: 0.35s var(--ease);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Pretendard", "Noto Sans KR", "Noto Sans SC", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", -apple-system,
               BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--cream-50);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-600); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.5rem); }
h4 { font-size: 1.15rem; }
h5 { font-size: 1rem; }
p  { color: var(--text-secondary); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}
.container-narrow { max-width: var(--container-narrow); }
.container-wide   { max-width: var(--container-wide); }
section { position: relative; }

/* ==========================================================================
   韩系温柔风装饰系统
   ========================================================================== */

/* 柔和渐变背景 */
.soft-gradient-bg {
  background:
    radial-gradient(ellipse at 15% 20%, rgba(168, 205, 228, 0.25) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 80%, rgba(245, 184, 138, 0.15) 0%, transparent 50%),
    var(--cream-50);
}
.cream-bg { background: var(--cream-100); }
.cream-deep-bg { background: var(--cream-200); }
.blue-bg { background: var(--blue-50); }
.blue-deep-bg { background: var(--blue-100); }
.apricot-bg { background: var(--apricot-50); }
.dark-bg { background: var(--blue-900); color: var(--cream-100); }
.dark-bg h2, .dark-bg h3, .dark-bg h4 { color: var(--cream-50); }
.dark-bg p { color: rgba(255,255,255,0.7); }

/* 柔和光斑装饰 */
.soft-blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(60px);
  opacity: 0.4;
}
.soft-blob.blue { background: var(--blue-300); }
.soft-blob.apricot { background: var(--apricot-300); }
.soft-blob.cream { background: var(--cream-300); }

/* 韩系分隔线 */
.soft-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-medium), transparent);
  margin: 0 auto;
}
.soft-divider.dashed {
  height: 0;
  border-top: 1px dashed var(--cream-400);
  background: none;
}

/* 标签 */
.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: var(--blue-100);
  color: var(--blue-700);
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}
.tag-pill.apricot { background: var(--apricot-100); color: var(--apricot-700); }
.tag-pill.cream { background: var(--cream-200); color: var(--cream-800); }

/* 眉标 */
.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-600);
  margin-bottom: 14px;
  position: relative;
  padding-left: 28px;
}
.eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 2px;
  background: var(--blue-500);
  border-radius: 2px;
}
.eyebrow.apricot { color: var(--apricot-600); }
.eyebrow.apricot::before { background: var(--apricot-500); }
.eyebrow.cream { color: var(--cream-700); }
.eyebrow.cream::before { background: var(--cream-500); }

/* ==========================================================================
   顶部导航（固定，滚动变色，移动端汉堡菜单）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(253, 252, 249, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(253, 252, 249, 0.96);
  border-bottom-color: var(--border-light);
  box-shadow: var(--shadow-sm);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand img {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.brand-text small {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-top: 2px;
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.main-nav > li {
  position: relative;
}
.main-nav > li > a {
  display: block;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.main-nav > li > a:hover,
.main-nav > li.active > a {
  color: var(--blue-700);
  background: var(--blue-50);
}
.main-nav > li.has-sub > a::after {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 6px;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  vertical-align: middle;
  transition: transform var(--transition);
}
.main-nav > li.has-sub:hover > a::after {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 240px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  border: 1px solid var(--border-light);
}
.main-nav > li.has-sub:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-menu li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  transition: all var(--transition);
}
.dropdown-menu li a:hover {
  background: var(--blue-50);
  color: var(--blue-700);
  padding-left: 18px;
}

/* 导航CTA */
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color: #fff !important;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  box-shadow: 0 4px 14px rgba(90, 155, 196, 0.35);
  flex-shrink: 0;
  margin-left: 8px;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(90, 155, 196, 0.45);
  color: #fff !important;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端抽屉 */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: #fff;
  z-index: 999;
  padding: 90px 24px 24px;
  overflow-y: auto;
  transition: right var(--transition);
  box-shadow: var(--shadow-xl);
}
.mobile-drawer.open {
  right: 0;
}
.mobile-drawer li a {
  display: block;
  padding: 14px 16px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
}
.mobile-drawer li a:hover {
  background: var(--blue-50);
  color: var(--blue-700);
}
.mobile-sub {
  padding-left: 16px;
}
.mobile-sub li a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 10px 16px;
}

/* 遮罩 */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(43, 74, 96, 0.4);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}
.overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   通用区块
   ========================================================================== */
.section {
  padding: 100px 0;
}
.section-tight {
  padding: 60px 0;
}
.section-head {
  max-width: 680px;
  margin-bottom: 56px;
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-head h2 {
  margin-bottom: 16px;
}
.section-head p {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color: #fff;
  box-shadow: 0 4px 16px rgba(90, 155, 196, 0.35);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(90, 155, 196, 0.45);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--blue-600);
  border-color: var(--blue-300);
}
.btn-outline:hover {
  background: var(--blue-50);
  border-color: var(--blue-500);
  color: var(--blue-700);
  transform: translateY(-2px);
}
.btn-apricot {
  background: linear-gradient(135deg, var(--apricot-400), var(--apricot-500));
  color: #fff;
  box-shadow: 0 4px 16px rgba(232, 127, 58, 0.35);
}
.btn-apricot:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(232, 127, 58, 0.45);
  color: #fff;
}
.btn-lg { padding: 16px 40px; font-size: 1.05rem; }
.btn-sm { padding: 10px 22px; font-size: 0.88rem; }
.btn-block { width: 100%; }

/* 文本链接 */
.txt-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blue-600);
  font-weight: 600;
  font-size: 0.95rem;
  transition: gap var(--transition);
}
.txt-link:hover {
  gap: 12px;
  color: var(--blue-700);
}

/* 工具类 */
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0 !important; }
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==========================================================================
   滚动渐入动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--blue-900);
  color: rgba(255,255,255,0.7);
  padding: 70px 0 0;
}
.site-footer .brand-text { color: #fff; }
.site-footer .brand-text small { color: rgba(255,255,255,0.5); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 50px;
}
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 20px;
  font-weight: 600;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.footer-col ul li a:hover {
  color: var(--blue-300);
  padding-left: 4px;
}
.footer-brand p {
  color: rgba(255,255,255,0.55);
  font-size: 0.88rem;
  line-height: 1.7;
}
.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}
.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition);
}
.footer-social a:hover {
  background: var(--blue-500);
  color: #fff;
  transform: translateY(-3px);
}
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
}
.footer-contact .ic {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--blue-300);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  color: rgba(255,255,255,0.45);
  font-size: 0.82rem;
}
.footer-bottom a {
  color: rgba(255,255,255,0.55);
  font-size: 0.82rem;
}
.footer-bottom a:hover { color: var(--blue-300); }
.footer-icp {
  display: inline;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 100;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  color: #fff;
}