/* ==========================================================================
   Link Display — Main Stylesheet
   济南联呈嗒放网络科技服务有限公司
   ========================================================================== */

/* --- Custom Properties --- */
:root {
  --blue: #0066FF;
  --blue-soft: #3385FF;
  --dark: #0F172A;
  --dark-soft: #1E293B;
  --gray: #334155;
  --gray-mid: #475569;
  --silver: #E2E8F0;
  --white: #F8FAFC;
  --lime: #22C55E;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.2);
  --transition: 200ms ease;
  --transition-slow: 400ms ease;
  --content-max: 1120px;
  --content-narrow: 800px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--blue);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--blue-soft);
}

ul, ol {
  list-style: none;
}

/* --- Focus / Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--blue);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 10000;
  font-weight: 600;
}

.skip-link:focus {
  top: 16px;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--dark);
  border-bottom: 1px solid var(--dark-soft);
}

.header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--white);
  letter-spacing: -0.02em;
}

.logo-link:hover {
  color: var(--silver);
}

.logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list a {
  display: block;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--silver);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background: var(--dark-soft);
  color: var(--white);
}

.nav-cta {
  background: var(--blue) !important;
  color: #fff !important;
  margin-left: 8px;
}

.nav-cta:hover {
  background: var(--blue-soft) !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--silver);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Hero — Modular Block, No Gradient
   ========================================================================== */
.hero {
  background: var(--dark);
  color: var(--white);
  padding: 96px 24px 80px;
}

.hero-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--dark-soft);
  border: 1px solid var(--gray);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--blue-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--lime);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--white);
}

.hero h1 .accent {
  color: var(--blue);
}

.hero-lead {
  font-size: 1.1875rem;
  line-height: 1.7;
  color: var(--silver);
  max-width: 600px;
  margin-bottom: 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
  line-height: 1.2;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background: var(--blue-soft);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--silver);
  border: 2px solid var(--gray);
}

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

/* Hero Inset Panel */
.hero-panel {
  background: var(--dark-soft);
  border: 1px solid var(--gray);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 600px;
}

.hero-panel-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-mid);
  margin-bottom: 16px;
}

.hero-panel-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.hero-panel-metric {
  text-align: center;
  padding: 16px 8px;
  background: var(--dark);
  border-radius: var(--radius-md);
}

.hero-panel-metric .value {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--blue);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.hero-panel-metric .label {
  display: block;
  font-size: 0.75rem;
  color: var(--silver);
  margin-top: 4px;
  font-weight: 500;
}

/* ==========================================================================
   Modular Blocks — General
   ========================================================================== */
.block {
  padding: 80px 24px;
}

.block-alt {
  background: var(--dark);
  color: var(--white);
}

.block-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.block-eyebrow {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 12px;
}

.block-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.block-alt .block-title {
  color: var(--white);
}

.block-desc {
  font-size: 1.0625rem;
  color: var(--gray-mid);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 48px;
}

.block-alt .block-desc {
  color: var(--silver);
}

/* ==========================================================================
   Inset Panel System
   ========================================================================== */
.inset-panel {
  background: var(--white);
  border: 1px solid var(--silver);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.block-alt .inset-panel {
  background: var(--dark-soft);
  border-color: var(--gray);
  box-shadow: var(--shadow-md);
}

.panel-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blue);
  background: #EBF5FF;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.block-alt .panel-label {
  background: #1A2A4A;
  color: var(--blue-soft);
}

.panel-title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--dark);
}

.block-alt .panel-title {
  color: var(--white);
}

.panel-desc {
  font-size: 0.9375rem;
  color: var(--gray-mid);
  line-height: 1.65;
}

.block-alt .panel-desc {
  color: var(--silver);
}

/* ==========================================================================
   Services — Modular Block with Inset Panels
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.service-panel {
  background: var(--white);
  border: 1px solid var(--silver);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-slow), border-color var(--transition-slow);
}

.service-panel:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--blue);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: var(--blue);
}

.service-panel h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  color: var(--dark);
}

.service-panel p {
  font-size: 0.9375rem;
  color: var(--gray-mid);
  line-height: 1.65;
  margin-bottom: 20px;
}

.service-stat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--silver);
}

.service-stat-value {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--blue);
}

.service-stat-label {
  font-size: 0.8125rem;
  color: var(--gray-mid);
  font-weight: 500;
}

/* ==========================================================================
   About — Embedded Within Content Block
   ========================================================================== */
.about-block {
  background: var(--white);
  padding: 0 24px 80px;
  margin-top: -1px;
}

.about-card {
  max-width: var(--content-max);
  margin: 0 auto;
  background: var(--dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-card-body {
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.about-card-body h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 20px;
}

.about-card-body p {
  color: var(--silver);
  font-size: 1rem;
  line-height: 1.7;
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-detail {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--dark-soft);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--blue);
}

.about-detail-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--blue);
}

.about-detail strong {
  display: block;
  color: var(--white);
  font-size: 0.9375rem;
  margin-bottom: 2px;
}

.about-detail span {
  color: var(--silver);
  font-size: 0.875rem;
}

/* ==========================================================================
   Approach — Alternating Inset Rows
   ========================================================================== */
.approach-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.approach-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: start;
  background: var(--white);
  border: 1px solid var(--silver);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-slow);
}

.approach-item:hover {
  box-shadow: var(--shadow-md);
}

.approach-num {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  font-size: 1.25rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.approach-content h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--dark);
}

.approach-content p {
  font-size: 0.9375rem;
  color: var(--gray-mid);
  line-height: 1.6;
}

/* ==========================================================================
   Industries — Tag Cloud Style Inset
   ========================================================================== */
.industries-block {
  background: var(--dark);
  padding: 80px 24px;
}

.industries-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: var(--content-max);
  margin: 0 auto;
}

.industry-tag {
  padding: 14px 24px;
  background: var(--dark-soft);
  border: 1px solid var(--gray);
  border-radius: var(--radius-sm);
  color: var(--silver);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.industry-tag:hover {
  border-color: var(--blue);
  color: var(--white);
  transform: translateY(-2px);
}

/* ==========================================================================
   Contact — Inset Form Panel
   ========================================================================== */
.contact-block {
  background: var(--white);
  padding: 80px 24px;
}

.contact-panel {
  max-width: var(--content-max);
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--silver);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

.contact-info {
  background: var(--dark);
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-info h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.contact-info > p {
  color: var(--silver);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--silver);
  font-size: 0.9375rem;
}

.contact-detail svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--blue);
}

.contact-detail a {
  color: var(--silver);
}

.contact-detail a:hover {
  color: var(--white);
}

.contact-address {
  font-size: 0.8125rem;
  color: var(--gray-mid);
  line-height: 1.6;
  border-top: 1px solid var(--gray);
  padding-top: 20px;
}

.contact-form-wrap {
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 12px 16px;
  border: 1px solid var(--silver);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--dark);
  background: var(--white);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--blue);
  outline: none;
  box-shadow: 0 0 0 3px #EBF5FF;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  align-self: flex-start;
  padding: 14px 32px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition);
}

.form-submit:hover {
  background: var(--blue-soft);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-feedback {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  display: none;
}

.form-feedback.success {
  display: block;
  background: #DCFCE7;
  color: #166534;
  border: 1px solid var(--lime);
}

.form-feedback.error {
  display: block;
  background: #FEE2E2;
  color: #991B1B;
  border: 1px solid #EF4444;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--dark);
  color: var(--silver);
  padding: 64px 24px 32px;
}

.footer-grid {
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--gray);
}

.footer-brand p {
  color: var(--gray-mid);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  color: var(--gray-mid);
  font-size: 0.875rem;
  padding: 6px 0;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--white);
}

.footer-bottom {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--gray-mid);
}

.footer-legal {
  display: flex;
  gap: 16px;
}

.footer-legal a {
  font-size: 0.8125rem;
  color: var(--gray-mid);
}

.footer-legal a:hover {
  color: var(--white);
}

/* ==========================================================================
   Scroll Animations
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Privacy & TOS Pages
   ========================================================================== */
.legal-page {
  background: var(--white);
  padding: 64px 24px 80px;
}

.legal-header {
  max-width: var(--content-narrow);
  margin: 0 auto 48px;
  text-align: center;
}

.legal-header h1 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--dark);
  margin-bottom: 12px;
}

.legal-header .legal-meta {
  font-size: 0.9375rem;
  color: var(--gray-mid);
}

.legal-body {
  max-width: var(--content-narrow);
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.8;
  color: var(--dark);
}

.legal-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-top: 40px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--silver);
}

.legal-body h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--dark);
  margin-top: 24px;
  margin-bottom: 8px;
}

.legal-body p {
  margin-bottom: 16px;
  font-size: 16px;
}

.legal-body ul,
.legal-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
  list-style: disc;
  font-size: 16px;
}

.legal-body ol {
  list-style: decimal;
}

.legal-body li {
  margin-bottom: 8px;
  font-size: 16px;
}

.legal-body strong {
  font-weight: 700;
  color: var(--dark);
}

.legal-body .highlight-box {
  background: #F0F7FF;
  border: 1px solid #BFD9FF;
  border-left: 4px solid var(--blue);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
  font-size: 16px;
}

.legal-body .contact-block-inline {
  background: var(--dark);
  color: var(--silver);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 32px;
  font-size: 16px;
}

.legal-body .contact-block-inline h2 {
  color: var(--white);
  border-bottom-color: var(--gray);
}

.legal-body .contact-block-inline p {
  color: var(--silver);
  font-size: 16px;
}

.legal-body .contact-block-inline a {
  color: var(--blue-soft);
}

.legal-back {
  max-width: var(--content-narrow);
  margin: 0 auto 32px;
}

.legal-back a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gray);
}

.legal-back a:hover {
  color: var(--blue);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .hamburger {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--dark-soft);
    border-bottom: 1px solid var(--gray);
    padding: 12px;
    gap: 2px;
    box-shadow: var(--shadow-lg);
  }

  .nav-list.open {
    display: flex;
  }

  .nav-list a {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 1rem;
  }

  .nav-cta {
    margin-left: 0;
    text-align: center;
    justify-content: center;
  }

  .hero {
    padding: 64px 24px 56px;
  }

  .hero-panel-metrics {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-card-body {
    grid-template-columns: 1fr;
    padding: 40px 28px;
    gap: 32px;
  }

  .contact-panel {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  .block {
    padding: 56px 20px;
  }

  .inset-panel,
  .service-panel {
    padding: 28px 24px;
  }

  .contact-info,
  .contact-form-wrap {
    padding: 32px 24px;
  }

  .approach-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}