/* ==========================================================================
   思威伏官网 - 全站样式
   设计原则：现代、信任、专业；科技绿主色；移动端优先
   ========================================================================== */

/* --- CSS变量 --- */
:root {
  --color-primary: #10B981;
  --color-primary-dark: #059669;
  --color-primary-light: #D1FAE5;
  --color-secondary: #0EA5E9;
  --color-accent: #F59E0B;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F9FAFB;
  --color-bg-muted: #F3F4F6;
  --color-border: #E5E7EB;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-trademark: #DC2626;
  --color-trademark-bg: #FEF2F2;
  --color-error: #EF4444;

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10);

  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --container: 1200px;
  --gap-sm: 8px;
  --gap: 16px;
  --gap-lg: 24px;
  --gap-xl: 48px;
}

/* --- 重置 --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--color-text); }
h1 { font-size: clamp(32px, 5vw, 48px); }
h2 { font-size: clamp(24px, 4vw, 36px); }
h3 { font-size: clamp(20px, 3vw, 24px); }
ul, ol { padding-left: 1.5em; }

/* --- 容器 --- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
@media (min-width: 640px) { .container { padding: 0 24px; } }

/* --- 导航栏 --- */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  height: 64px;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 18px; color: var(--color-text);
}
.logo-icon { width: 28px; height: 28px; }

/* 顶部导航品牌名 + R 标 */
.logo-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}
.logo-brand .r-mark {
  font-size: 11px;
  color: var(--color-trademark);
  font-weight: 700;
  vertical-align: super;
  line-height: 1;
}

.nav-menu {
  display: none; gap: 32px; align-items: center;
}
.nav-menu a { color: var(--color-text); font-size: 15px; font-weight: 500; }
.nav-menu a:hover, .nav-menu a.active { color: var(--color-primary); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-phone {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--color-primary); font-weight: 600; font-size: 15px;
}
.nav-phone svg { width: 16px; height: 16px; }

.menu-toggle {
  display: flex; flex-direction: column; gap: 4px;
  background: none; border: 0; padding: 8px; cursor: pointer;
}
.menu-toggle span {
  display: block; width: 22px; height: 2px; background: var(--color-text);
  transition: 0.2s;
}
@media (min-width: 768px) {
  .nav-menu { display: flex; }
  .menu-toggle { display: none; }
}

/* --- 移动菜单 --- */
.mobile-menu {
  display: none;
  position: fixed; inset: 64px 0 0 0;
  background: var(--color-bg);
  padding: 24px;
  z-index: 99;
  overflow-y: auto;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block; padding: 12px 0; border-bottom: 1px solid var(--color-border);
  color: var(--color-text); font-size: 16px;
}


/* --- R 商标样式 (品牌名突出) --- */
.trademark {
  font-weight: 700;
  color: var(--color-primary);
  display: inline-block;
  letter-spacing: -0.02em;
}
.trademark::after {
  content: "®";
  font-size: 0.5em;
  vertical-align: super;
  color: var(--color-trademark);
  margin-left: 1px;
  font-weight: 700;
  font-family: "Helvetica Neue", Arial, sans-serif;
  /* 让 R 标更醒目 */
  display: inline-block;
  padding: 0 1px;
}
.trademark-sm { font-size: 0.95em; }
.trademark-lg { font-size: 1.15em; }

/* footer 版权里 R标更柔和 */
.footer-brand .trademark { color: inherit; }
.footer-brand .trademark::after { color: var(--color-trademark); opacity: 0.85; }

/* navbar logo 里的 R 标 */
.nav-inner .trademark { color: var(--color-text); }
.nav-inner .trademark::after { color: var(--color-trademark); font-size: 0.45em; }

/* 在标题里 R 标紧凑一些 */
h1 .trademark, h2 .trademark, h3 .trademark {
  white-space: nowrap;
}


/* --- 按钮 --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600;
  border: 0; cursor: pointer; transition: all 0.2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-primary); color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; transform: translateY(-1px); }
.btn-secondary {
  background: #fff; color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-secondary:hover { background: var(--color-primary-light); color: var(--color-primary-dark); }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-block { width: 100%; }

/* --- Hero --- */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(180deg, #ECFDF5 0%, #FFFFFF 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -200px; right: -200px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 {
  margin-bottom: 20px; max-width: 800px; margin-left: auto; margin-right: auto;
}
.hero h1 .highlight { color: var(--color-primary); }
.hero .subtitle {
  font-size: clamp(16px, 2.5vw, 20px); color: var(--color-text-light);
  max-width: 700px; margin: 0 auto 32px;
}
.hero-actions {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
  margin-bottom: 40px;
}
.hero-trust {
  display: flex; flex-wrap: wrap; gap: 24px; justify-content: center;
  font-size: 14px; color: var(--color-text-light);
}
.hero-trust .item { display: flex; align-items: center; gap: 6px; }
.hero-trust svg { width: 16px; height: 16px; color: var(--color-primary); }

@media (min-width: 768px) {
  .hero { padding: 100px 0 80px; }
}

/* --- 数据条 --- */
.stats {
  padding: 40px 0;
  background: var(--color-primary);
  color: #fff;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
  text-align: center;
}
.stat-num { font-size: 32px; font-weight: 800; line-height: 1; }
.stat-label { font-size: 14px; opacity: 0.9; margin-top: 6px; }
@media (min-width: 768px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .stat-num { font-size: 40px; }
}

/* --- 区块通用 --- */
.section { padding: 80px 0; }
.section-soft { background: var(--color-bg-soft); }
.section-dark { background: var(--color-text); color: #fff; }
.section-header { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-header .eyebrow {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  background: var(--color-primary-light); color: var(--color-primary-dark);
  font-size: 13px; font-weight: 600; margin-bottom: 12px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 17px; color: var(--color-text-light); }

/* --- 服务卡片 --- */
.service-grid {
  display: grid; grid-template-columns: 1fr; gap: 20px;
}
@media (min-width: 640px) { .service-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .service-grid { grid-template-columns: repeat(3, 1fr); } }
.service-card {
  display: block; padding: 32px 24px;
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all 0.2s;
  text-decoration: none; color: inherit;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  color: inherit;
}
.service-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: var(--color-primary-light); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.service-icon svg { width: 28px; height: 28px; }
.service-card h3 { font-size: 19px; margin-bottom: 8px; }
.service-card p { color: var(--color-text-light); font-size: 14px; margin-bottom: 16px; }
.service-card .more {
  color: var(--color-primary); font-size: 14px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 4px;
}

/* --- 案例卡片 --- */
.case-grid {
  display: grid; grid-template-columns: 1fr; gap: 24px;
}
@media (min-width: 768px) { .case-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .case-grid { grid-template-columns: repeat(3, 1fr); } }
.case-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); overflow: hidden;
  transition: 0.2s;
}
.case-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.case-body { padding: 24px; }
.case-tag {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  background: var(--color-primary-light); color: var(--color-primary-dark);
  font-size: 12px; font-weight: 600; margin-bottom: 12px;
}
.case-card h3 { font-size: 18px; margin-bottom: 12px; }
.case-meta {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
  padding: 16px 0; border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border); margin-bottom: 16px;
  font-size: 13px;
}
.case-meta dt { color: var(--color-text-light); }
.case-meta dd { color: var(--color-text); font-weight: 600; }
.case-card .highlight {
  font-size: 24px; font-weight: 700; color: var(--color-primary);
}

/* --- 内容文章 --- */
.article {
  max-width: 760px; margin: 0 auto;
}
.article h1 { margin-bottom: 20px; }
.article h2 {
  font-size: 24px; margin: 40px 0 16px;
  padding-left: 12px; border-left: 3px solid var(--color-primary);
}
.article h3 { font-size: 19px; margin: 32px 0 12px; }
.article p { margin-bottom: 16px; color: var(--color-text); }
.article ul, .article ol { margin-bottom: 16px; padding-left: 1.5em; }
.article li { margin-bottom: 6px; }
.article blockquote {
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  padding: 16px 20px; margin: 20px 0; border-radius: var(--radius-sm);
  color: var(--color-text);
}
.article table {
  width: 100%; border-collapse: collapse; margin: 20px 0;
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  overflow: hidden;
}
.article th, .article td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--color-border); }
.article th { background: var(--color-bg-muted); font-weight: 600; }

/* --- 视频区 --- */
.video-section { padding: 60px 0; }
.video-grid {
  display: grid; grid-template-columns: 1fr; gap: 24px;
}
@media (min-width: 768px) { .video-grid { grid-template-columns: repeat(3, 1fr); } }
.video-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); overflow: hidden;
}
.video-placeholder {
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #DBEAFE 100%);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-light); font-size: 14px;
}
.video-card-body { padding: 16px; }
.video-card-body h4 { font-size: 15px; margin-bottom: 4px; }
.video-card-body p { font-size: 13px; color: var(--color-text-light); }

/* --- 联系区 --- */
.cta-band {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff; padding: 60px 0; text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: 12px; }
.cta-band p { font-size: 18px; opacity: 0.95; margin-bottom: 24px; }
.cta-band .btn {
  background: #fff; color: var(--color-primary);
  font-size: 18px; padding: 16px 36px;
}
.cta-band .btn:hover { background: #F9FAFB; }

.phone-display {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 800; letter-spacing: 0.02em;
  color: #fff;
  margin: 16px 0;
}

/* --- 表单 --- */
.form-card {
  max-width: 560px; margin: 0 auto;
  background: #fff; border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow);
}
.form-card label {
  display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px;
}
.form-card input, .form-card textarea, .form-card select {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px; font-family: inherit;
  background: #fff;
  transition: border-color 0.2s;
}
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
  outline: 0; border-color: var(--color-primary);
}
.form-card .field { margin-bottom: 16px; }
.form-card textarea { min-height: 100px; resize: vertical; }

/* --- Footer --- */
.footer {
  background: #0F172A; color: #94A3B8; padding: 60px 0 30px;
}
.footer-grid {
  display: grid; grid-template-columns: 1fr; gap: 32px;
  margin-bottom: 32px;
}
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 600; }
.footer a { color: #94A3B8; display: block; padding: 4px 0; font-size: 14px; }
.footer a:hover { color: #fff; }
.footer .meta { font-size: 13px; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid #1E293B; padding-top: 24px;
  font-size: 13px; text-align: center;
}
.footer-bottom-bar {
  background: #0B1220; border-top: 1px solid #1E293B;
  padding: 18px 0; margin-top: 32px;
  font-size: 13px; color: #94A3B8;
}
.footer-bottom-row {
  display: flex; flex-wrap: wrap; justify-content: center;
  align-items: center; gap: 8px;
}
.footer-bottom-row .dot { color: #475569; }
.footer-bottom-row a:hover { color: #cbd5e1; }
@media (max-width: 768px) {
  .footer-bottom-row { flex-direction: column; gap: 4px; }
  .footer-bottom-row .dot { display: none; }
}
.qrcode {
  width: 120px; height: 120px;
  background: linear-gradient(135deg, #1E293B, #334155);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: #64748B; font-size: 12px; text-align: center; margin-top: 12px;
}

/* --- 通用工具类 --- */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.bg-soft { background: var(--color-bg-soft); }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; } .mt-5 { margin-top: 48px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; } .mb-4 { margin-bottom: 32px; } .mb-5 { margin-bottom: 48px; }

/* --- 动效 --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s, transform 0.6s;
}
.fade-in.visible {
  opacity: 1; transform: translateY(0);
}

/* --- 计算器 --- */
.calc-card {
  max-width: 720px; margin: 0 auto;
  background: #fff; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); padding: 32px;
}
.calc-field { margin-bottom: 24px; }
.calc-field label {
  display: block; font-weight: 600; margin-bottom: 8px;
}
.calc-slider { width: 100%; }
.calc-options {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}
@media (min-width: 640px) { .calc-options { grid-template-columns: repeat(6, 1fr); } }
.calc-option {
  padding: 12px 8px; border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm); text-align: center;
  cursor: pointer; font-size: 14px; font-weight: 600;
  background: #fff;
}
.calc-option.active {
  background: var(--color-primary); color: #fff; border-color: var(--color-primary);
}
.calc-result {
  margin-top: 24px; padding: 20px;
  background: var(--color-primary-light); border-radius: var(--radius);
  border: 1px solid var(--color-primary);
}
.calc-row {
  display: flex; justify-content: space-between;
  padding: 8px 0; border-bottom: 1px solid rgba(16, 185, 129, 0.2);
  font-size: 14px;
}
.calc-row:last-child { border-bottom: 0; }
.calc-row .label { color: var(--color-text-light); }
.calc-row .value { color: var(--color-text); font-weight: 600; }
.calc-row.total {
  border-top: 2px solid var(--color-primary);
  margin-top: 8px; padding-top: 16px;
  font-size: 18px;
}
.calc-row.total .value { color: var(--color-primary); font-size: 24px; font-weight: 800; }