:root {
  --bosch-red: #e20015;
  --bosch-red-dark: #b80012;
  --ink: #181b20;
  --muted: #656c76;
  --bg: #f7f8fa;
  --bg-alt: #eef1f5;
  --card: #fff;
  --border: #dde2ea;
  --radius: 14px;
  --shadow: 0 16px 45px rgba(11, 22, 43, 0.1);
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
}

.brand-sub {
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0;
  margin-left: 6px;
}

.nav {
  display: none;
  gap: 22px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.nav a:hover {
  color: var(--bosch-red);
}

@media (min-width: 880px) {
  .nav {
    display: flex;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--bosch-red);
  color: #fff;
}

.btn-primary:hover {
  background: var(--bosch-red-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--bosch-red);
  color: var(--bosch-red);
}

.btn-ghost.light {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-ghost.light:hover {
  border-color: #fff;
  color: #fff;
}

.btn-lg {
  padding: 14px 26px;
  font-size: 1rem;
}

.hero {
  position: relative;
  min-height: 76vh;
  padding: 120px 0 100px;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(10, 20, 33, 0.76) 25%, rgba(10, 20, 33, 0.36) 55%, rgba(226, 0, 21, 0.22) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  color: #fff;
}

.eyebrow {
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--bosch-red);
  font-weight: 700;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2rem, 4.3vw, 3.2rem);
  line-height: 1.2;
  margin: 0 0 18px;
  font-weight: 700;
}

.lead {
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 30px;
  max-width: 680px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.stats {
  margin-top: -36px;
  position: relative;
  z-index: 5;
}

.stats-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 700px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 18px;
  text-align: center;
}

.stat-card strong {
  display: block;
  font-size: 1.35rem;
  color: var(--bosch-red);
}

.stat-card span {
  font-size: 0.88rem;
  color: var(--muted);
}

.section {
  padding: 72px 0;
}

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

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head.left {
  text-align: left;
  margin-left: 0;
}

.section-head h2 {
  margin: 0 0 12px;
  font-size: 1.75rem;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.section-head.light h2,
.section-head.light p {
  color: #fff;
}

.framework-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 768px) {
  .framework-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.card-accent {
  border-color: rgba(226, 0, 21, 0.25);
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--bosch-red);
  margin-bottom: 12px;
}

.card h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

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

.section-dark {
  background: linear-gradient(160deg, #0f1929 0%, #11253e 55%, #132e50 100%);
}

.space-grid {
  display: grid;
  gap: 18px;
}

@media (min-width: 900px) {
  .space-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.space-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(2px);
}

.space-card img {
  width: 100%;
  height: 210px;
  object-fit: cover;
  display: block;
}

.space-copy {
  padding: 18px;
}

.space-copy h3 {
  margin: 0 0 8px;
  color: #fff;
}

.space-copy p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
}

.split {
  display: grid;
  gap: 40px;
  align-items: start;
}

.split-visual {
  display: grid;
  gap: 26px;
  align-items: center;
}

@media (min-width: 900px) {
  .split,
  .split-visual {
    grid-template-columns: 1fr 1fr;
  }
}

.visual-block img {
  width: 100%;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 18px;
}

.text-block h2 {
  margin-top: 0;
}

.checklist {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

.checklist li {
  margin-bottom: 10px;
}

.panel {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 28px;
  box-shadow: var(--shadow);
}

.panel h3 {
  margin-top: 0;
}

.experience-card {
  display: grid;
  gap: 0;
  background: #fff;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

@media (min-width: 900px) {
  .experience-card {
    grid-template-columns: 1.15fr 1fr;
  }
}

.experience-left img {
  width: 100%;
  height: 100%;
  min-height: 300px;
  object-fit: cover;
  display: block;
}

.experience-right {
  padding: 34px 30px;
}

.experience-right h2 {
  margin: 0 0 12px;
  line-height: 1.3;
}

.tip {
  margin-top: 16px;
  background: var(--bg-alt);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--muted);
}

.tip span {
  display: inline-block;
  background: #fff;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  margin-right: 8px;
  color: var(--ink);
}

.service-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 720px) {
  .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.service-item h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.cta-section {
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
  color: #fff;
}

.cta-section h2 {
  margin-top: 0;
}

.cta-section .muted {
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 0;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@media (min-width: 720px) {
  .cta-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-section .btn-primary {
  background: #fff;
  color: var(--bosch-red);
}

.cta-section .btn-primary:hover {
  background: var(--bg-alt);
}

.cta-section .btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.cta-section .btn-ghost:hover {
  border-color: #fff;
  color: #fff;
}

.site-footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--border);
  background: #fff;
}

.footer-inner p {
  margin: 0 0 10px;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-inner .small {
  font-size: 0.78rem;
  color: #888;
}

code {
  font-size: 0.9em;
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
}

@media (max-width: 640px) {
  .brand-sub {
    display: none;
  }

  .hero {
    min-height: 68vh;
    padding-top: 96px;
  }

  .section {
    padding: 58px 0;
  }
}