/* ===== 变量与基础 ===== */
:root {
  --color-bg: #0a0e17;
  --color-surface: #111827;
  --color-surface-2: #1a2332;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-primary: #f59e0b;
  --color-primary-hover: #d97706;
  --color-accent: #3b82f6;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --container: min(1200px, 100vw - 48px);
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--color-primary);
  color: #0a0e17;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #0a0e17;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-block {
  width: 100%;
}

.btn-nav {
  padding: 8px 16px;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: #0a0e17;
  font-weight: 500;
}

.btn-nav:hover {
  background: var(--color-primary-hover);
  color: #0a0e17;
}

/* ===== 导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), #ea580c);
  color: #0a0e17;
  border-radius: 10px;
  font-size: 16px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

/* ===== 主视觉 Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(245, 158, 11, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(59, 130, 246, 0.08), transparent);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.hero-label {
  font-size: 13px;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--color-primary);
}

.hero-desc {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-visual {
  position: absolute;
  right: 5%;
  bottom: 15%;
  display: flex;
  gap: 24px;
  align-items: flex-end;
}

.mockup {
  padding: 24px 32px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: rgba(26, 35, 50, 0.6);
  backdrop-filter: blur(8px);
}

.mockup-mini {
  transform: translateY(20px);
}

.mockup-platform {
  transform: translateY(0);
}

@media (max-width: 900px) {
  .hero-visual {
    display: none;
  }
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
}

.section-head {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
}

/* ===== 核心业务 ===== */
.services {
  background: var(--color-surface);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

@media (max-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

.service-card {
  padding: 40px 32px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.service-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.service-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card > p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  line-height: 1.65;
}

.service-features {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.service-features li {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
}

/* ===== 解决方案 ===== */
.solutions-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.solution-item {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  padding: 32px 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s;
}

.solution-item:hover {
  border-color: rgba(245, 158, 11, 0.25);
}

.solution-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.8;
  line-height: 1;
}

.solution-body h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.solution-body p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (max-width: 600px) {
  .solution-item {
    flex-direction: column;
    gap: 16px;
    padding: 24px;
  }
}

/* ===== 关于我们 ===== */
.about {
  background: var(--color-surface);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

@media (max-width: 900px) {
  .about-inner {
    grid-template-columns: 1fr;
  }
}

.about-content .section-tag {
  margin-bottom: 12px;
}

.about-content .section-title {
  margin-bottom: 20px;
}

.about-text {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 32px;
}

.about-text strong {
  color: var(--color-primary);
}

.about-stats {
  display: flex;
  gap: 48px;
}

.stat {
  font-size: 15px;
  color: var(--color-text-muted);
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  margin-right: 4px;
}

.stat-label {
  display: block;
  font-size: 13px;
  margin-top: 4px;
}

.about-card {
  padding: 48px;
  background: linear-gradient(135deg, var(--color-surface-2), rgba(245, 158, 11, 0.08));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 18px;
  font-weight: 500;
  text-align: center;
  color: var(--color-text-muted);
}

/* ===== 联系我们 ===== */
.contact-box {
  max-width: 640px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  padding: 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

@media (max-width: 768px) {
  .contact-box {
    grid-template-columns: 1fr;
    padding: 32px 24px;
  }
}

.contact-form label {
  display: block;
  margin-bottom: 20px;
}

.contact-form label span {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 500px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.contact-form .btn {
  margin-top: 8px;
}

.contact-info p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.contact-info strong {
  color: var(--color-text);
  font-size: 16px;
}

.contact-address {
  margin-top: 16px;
}

/* ===== 页脚 ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
}

.footer-brand .logo-icon {
  width: 28px;
  height: 28px;
  font-size: 14px;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== 移动端导航 ===== */
@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 24px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .menu-toggle span {
    transition: transform 0.3s, opacity 0.3s;
  }
}