/* ==========================================================================
   md1k (千想科技 · MindDone) 全新现代官方网站全局样式表
   AI-Native Enterprise Engineering & System Solutions
   ========================================================================== */

:root {
  --bg-dark: #070a12;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 35, 56, 0.9);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 210, 255, 0.4);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --cyan-primary: #00d2ff;
  --blue-primary: #3a7bd5;
  --purple-glow: #8b5cf6;
  --green-accent: #10b981;
  --gradient-brand: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
  --gradient-glow: linear-gradient(135deg, #00d2ff 0%, #8b5cf6 50%, #ec4899 100%);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  background: radial-gradient(circle at 50% 0%, rgba(20, 38, 80, 0.35) 0%, rgba(7, 10, 18, 0.98) 70%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* 容器规范 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(0, 210, 255, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* 徽章 Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 9999px;
  background: rgba(0, 210, 255, 0.1);
  color: var(--cyan-primary);
  border: 1px solid rgba(0, 210, 255, 0.25);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cyan-primary);
  box-shadow: 0 0 8px var(--cyan-primary);
}

/* ==========================================================================
   Header 导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 18, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo img {
  height: 40px;
  width: auto;
  border-radius: 8px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 11px;
  color: var(--cyan-primary);
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #fff;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* ==========================================================================
   Hero 首屏视觉区
   ========================================================================== */
.hero-section {
  padding: 90px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.25;
  margin: 16px 0 20px;
  letter-spacing: -1px;
}

.hero-content h1 .gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

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

.hero-trust-row {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px;
  color: var(--text-dim);
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.hero-trust-item svg {
  color: var(--cyan-primary);
  flex-shrink: 0;
}

/* 交互式 AI 模拟终端 */
.terminal-window {
  background: rgba(13, 17, 26, 0.95);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 40px rgba(0, 210, 255, 0.1);
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red { background: #ef4444; }
.terminal-dot.yellow { background: #f59e0b; }
.terminal-dot.green { background: #10b981; }

.terminal-title {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: #cbd5e1;
  min-height: 320px;
}

.t-prompt {
  color: var(--cyan-primary);
}

.t-success {
  color: var(--green-accent);
}

.t-highlight {
  color: #facc15;
}

.t-comment {
  color: var(--text-dim);
}

.t-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--cyan-primary);
  vertical-align: middle;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ==========================================================================
   板块标准规范（Section）
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-subtitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   卡片网格系统（Grid & Cards）
   ========================================================================== */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px 28px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.ai-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.ai-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(0, 210, 255, 0.12);
}

.ai-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid rgba(0, 210, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-primary);
  margin-bottom: 20px;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

.card-features {
  list-style: none;
  margin-bottom: 28px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

.card-features li {
  font-size: 13px;
  color: #cbd5e1;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.card-features li svg {
  color: var(--green-accent);
  flex-shrink: 0;
}

.card-roi-tag {
  font-size: 12px;
  font-weight: 600;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 6px 12px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: inline-block;
}

/* ==========================================================================
   ROI 数据指标区
   ========================================================================== */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px 24px;
  text-align: center;
}

.stat-num {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 8px;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.stat-sub {
  font-size: 13px;
  color: var(--text-dim);
}

/* ==========================================================================
   交付保障承诺（Four Guarantees）
   ========================================================================== */
.guarantee-box {
  background: linear-gradient(180deg, rgba(16, 24, 40, 0.6) 0%, rgba(11, 16, 28, 0.8) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 48px;
}

.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.guarantee-item {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guarantee-num {
  font-size: 32px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.15);
  font-family: var(--font-mono);
}

.guarantee-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.guarantee-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   交付流程 Timeline
   ========================================================================== */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 28px 24px;
  position: relative;
}

.process-step {
  font-size: 13px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--cyan-primary);
  margin-bottom: 12px;
}

.process-title {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.process-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   底部转化号召区（CTA Box）
   ========================================================================== */
.cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(0, 210, 255, 0.15) 0%, rgba(13, 19, 33, 0.95) 75%);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: 28px;
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.cta-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-desc {
  font-size: 17px;
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

/* ==========================================================================
   Footer 页脚
   ========================================================================== */
.site-footer {
  background: #04060a;
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 40px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 16px 0 24px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--cyan-primary);
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: #cbd5e1;
  margin-bottom: 12px;
}

.qr-box {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.qr-box img {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}

.qr-tip {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
}

/* ==========================================================================
   全局弹窗留资 Modal
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: #0f1626;
  border: 1px solid var(--border-active);
  border-radius: 24px;
  width: 100%;
  max-width: 540px;
  padding: 36px 32px;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 50px rgba(0, 210, 255, 0.2);
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 24px;
  cursor: pointer;
}

.modal-close:hover {
  color: #fff;
}

.modal-header h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
}

.modal-header p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  color: #fff;
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--cyan-primary);
  box-shadow: 0 0 0 3px rgba(0, 210, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
}

.form-textarea {
  min-height: 80px;
  resize: vertical;
}

/* ==========================================================================
   移动端响应式规范
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .card-grid-3, .card-grid-4, .guarantee-grid, .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-content h1 {
    font-size: 32px;
  }
  .card-grid-3, .card-grid-2, .card-grid-4, .guarantee-grid, .process-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .cta-banner {
    padding: 40px 24px;
  }
  .cta-title {
    font-size: 26px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}


/* 客户背书 Logo 墙 */
.client-proof-section {
  padding: 40px 0 20px;
  text-align: center;
}
.client-proof-title {
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 20px;
  font-weight: 600;
}
.client-logo-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}
.client-logo-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.3s ease;
}
.client-logo-card:hover {
  border-color: rgba(0, 210, 255, 0.3);
  background: rgba(0, 210, 255, 0.05);
  transform: translateY(-2px);
}
.client-logo-card img {
  height: 28px;
  width: auto;
  opacity: 0.85;
  transition: opacity 0.2s;
}
.client-logo-card:hover img {
  opacity: 1;
}
.client-logo-card span {
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
}