/* ==========================================================================
   PWM.CN Official Interim Landing Page Design System
   Modern Industrial Tech & Open Source Dual Brand Layout - 2026 Edition
   ========================================================================== */

:root {
  /* Color System */
  --primary-blue: #0066FF;
  --primary-blue-hover: #0052CC;
  --primary-blue-light: #EBF3FF;
  --primary-blue-glow: rgba(0, 102, 255, 0.22);
  
  --bearpi-blue: #1677FF;
  --bearpi-blue-hover: #0958D9;
  --bearpi-blue-light: #F0F7FF;
  --bearpi-blue-border: #BAE0FF;

  --wechat-green: #07C160;
  --wechat-green-light: #F2FAF5;
  --wechat-green-border: #D4F3E3;
  
  --dark-primary: #0C111D;
  --dark-secondary: #344054;
  --dark-tertiary: #667085;
  --text-muted: #98A2B3;
  
  --bg-page: #F6F8FC;
  --card-bg: #FFFFFF;
  --card-border: rgba(228, 235, 245, 0.85);
  --card-border-hover: rgba(0, 102, 255, 0.35);
  
  --card-shadow: 0 12px 32px -10px rgba(16, 24, 40, 0.06), 0 4px 6px -4px rgba(16, 24, 40, 0.03);
  --card-shadow-hover: 0 24px 48px -12px rgba(0, 68, 170, 0.12), 0 8px 16px -6px rgba(0, 68, 170, 0.04);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  background-color: var(--bg-page);
  color: var(--dark-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(at 15% 15%, rgba(0, 102, 255, 0.045) 0px, transparent 45%),
    radial-gradient(at 85% 10%, rgba(22, 119, 255, 0.055) 0px, transparent 45%),
    radial-gradient(at 50% 85%, rgba(7, 193, 96, 0.035) 0px, transparent 55%),
    linear-gradient(180deg, #FFFFFF 0%, #F5F8FC 60%, #EEF3FA 100%);
}

/* Subtle background tech grid */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(0, 70, 180, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 70, 180, 0.02) 1px, transparent 1px);
  z-index: 0;
}

/* Main Container Layout - Full Viewport Vertical Centering */
.app-container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 24px 28px;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100vh;
}

/* ==========================================================================
   Header Section
   ========================================================================== */
.header-section {
  flex-shrink: 0;
  width: 100%;
}

.header-nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(228, 235, 245, 0.7);
}

.brand-wrapper {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

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

.brand-logo-text {
  font-size: 2.2rem;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.05em;
  color: #0A0F1D;
  display: inline-flex;
  align-items: baseline;
  user-select: none;
}

.brand-logo-text .dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--primary-blue);
  border-radius: 2px;
  margin: 0 3px 2px 2px;
  transform: skewX(-12deg);
  box-shadow: 0 0 8px rgba(0, 102, 255, 0.6);
}

.brand-logo-cn {
  font-size: 1.62rem;
  font-weight: 800;
  font-style: italic;
  color: #1E293B;
  letter-spacing: -0.03em;
}

.brand-slogan {
  font-size: 0.82rem;
  color: var(--dark-tertiary);
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.brand-slogan-en {
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #1D2939;
}

.brand-slogan .slogan-line {
  color: #D0D5DD;
  margin: 0 2px;
}

/* Status Pill */
.status-pill-badge {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.status-title-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #344054;
  letter-spacing: 0.02em;
}

.status-pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--primary-blue);
  border-radius: 50%;
  position: relative;
}

.status-pulse-dot::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: rgba(0, 102, 255, 0.4);
  animation: pulse-ring 2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.6); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.status-progress-track {
  width: 96px;
  height: 4px;
  background-color: #E4E7EC;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.status-progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 50%;
  background: linear-gradient(90deg, #1890FF, #0052CC);
  border-radius: 4px;
  animation: progress-slide 2.5s ease-in-out infinite alternate;
}

@keyframes progress-slide {
  0% { left: 0%; width: 35%; }
  50% { width: 60%; }
  100% { left: 50%; width: 45%; }
}

/* ==========================================================================
   Main Content - Vertically Centered Dual Action Cards
   ========================================================================== */
.main-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 36px 0;
  width: 100%;
}

.dual-brand-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  width: 100%;
  max-width: 960px;
  align-items: stretch;
}

/* Action Clean Card */
.action-clean-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  padding: 38px 36px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.action-clean-card:hover {
  transform: translateY(-4px);
  border-color: var(--card-border-hover);
  box-shadow: var(--card-shadow-hover);
}

/* Top Accent Line on Hover */
.bearpi-clean-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #BF1A20, #FF5252);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.bearpi-clean-card:hover::after {
  opacity: 1;
}

.pwm-clean-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #0052CC, #0066FF);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.pwm-clean-card:hover::after {
  opacity: 1;
}

/* Card Top Identity */
.card-top-identity {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 18px;
}

.card-brand-symbol {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.bearpi-symbol {
  width: 40px;
  height: 34px;
}

.card-brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #101828;
  letter-spacing: -0.01em;
}

.card-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: #0066FF;
  background: #EBF3FF;
  border: 1px solid rgba(0, 102, 255, 0.2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 4px;
}

/* Headlines */
.card-headline {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0C111D;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.card-subhead {
  font-size: 0.94rem;
  color: var(--dark-tertiary);
  line-height: 1.55;
  max-width: 360px;
}

/* Mid Action Slot (Equal Height for Button & QR Code) */
.card-action-slot {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 190px;
  margin: 18px 0 14px;
}

/* Left Card: Primary Jump Button */
.btn-clean-jump {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, #1E80FF 0%, #0062E3 100%);
  color: #FFFFFF;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  padding: 15px 32px;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 24px rgba(0, 98, 227, 0.28);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  width: 88%;
  max-width: 320px;
}

.btn-clean-jump::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.32), transparent);
  transform: skewX(-20deg);
  transition: 0.7s;
}

.btn-clean-jump:hover::before {
  left: 140%;
}

.btn-clean-jump:hover {
  background: linear-gradient(135deg, #2B8AFF 0%, #0054C4 100%);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 14px 30px rgba(0, 98, 227, 0.38);
}

.btn-arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.btn-clean-jump:hover .btn-arrow {
  transform: translateX(4px);
}

/* Right Card: QR Code Box */
.qrcode-box-simple {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-md);
  padding: 10px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
  position: relative;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.qrcode-box-simple:hover {
  transform: scale(1.03);
  border-color: var(--wechat-green);
  box-shadow: 0 10px 24px rgba(7, 193, 96, 0.16);
}

/* Corner Reticles */
.qrcode-box-simple::before,
.qrcode-box-simple::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--wechat-green);
  border-style: solid;
  pointer-events: none;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.qrcode-box-simple::before {
  top: 5px;
  left: 5px;
  border-width: 2px 0 0 2px;
  border-top-left-radius: 4px;
}

.qrcode-box-simple::after {
  bottom: 5px;
  right: 5px;
  border-width: 0 2px 2px 0;
  border-bottom-right-radius: 4px;
}

.qrcode-box-simple:hover::before,
.qrcode-box-simple:hover::after {
  opacity: 1;
}

.qrcode-clean-img {
  width: 130px;
  height: 130px;
  display: block;
  border-radius: 6px;
}

.qrcode-clean-hint {
  font-size: 0.74rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 5px;
  transition: color var(--transition-fast);
}

.qrcode-box-simple:hover .qrcode-clean-hint {
  color: var(--wechat-green);
}

/* Card Bottom Quote */
.card-bottom-quote {
  font-size: 0.94rem;
  font-weight: 600;
  color: #475569;
  letter-spacing: 0.02em;
  padding-top: 14px;
  border-top: 1px solid #F1F5F9;
  width: 100%;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer-container {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid #E4E7EC;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.footer-values {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #475569;
  letter-spacing: 0.04em;
}

.footer-separator {
  color: #D0D5DD;
  font-weight: 300;
}

.footer-slogan-en {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #98A2B3;
  text-transform: uppercase;
}

.footer-copyright {
  font-size: 0.78rem;
  color: #98A2B3;
}

/* ==========================================================================
   Modal Lightbox (QR Code Zoom)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(12, 17, 29, 0.72);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: #FFFFFF;
  padding: 30px;
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
  max-width: 360px;
  width: 90%;
  text-align: center;
  position: relative;
  transform: scale(0.92);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-box {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #F2F4F7;
  color: #667085;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: #E4E7EC;
  color: #101828;
}

.modal-qr-large {
  width: 100%;
  max-width: 270px;
  height: auto;
  max-height: 60vh;
  object-fit: contain;
  display: block;
  margin: 14px auto;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
}

.modal-qr-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #101828;
}

.modal-qr-desc {
  font-size: 0.88rem;
  color: #667085;
  margin-top: 4px;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 880px) {
  .main-content {
    padding: 24px 0;
  }

  .dual-brand-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .action-clean-card {
    padding: 30px 24px 26px;
  }

  .card-action-slot {
    min-height: 160px;
  }
}

@media (max-width: 640px) {
  .app-container {
    padding: 18px 16px 28px;
    min-height: 100vh;
  }

  .header-nav-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .status-pill-badge {
    align-items: flex-start;
  }

  .card-headline {
    font-size: 1.35rem;
  }

  .btn-clean-jump {
    width: 100%;
    padding: 14px 20px;
  }

  .footer-values {
    gap: 8px;
    font-size: 0.8rem;
  }

  .footer-separator {
    display: none;
  }

  .footer-values span {
    padding: 2px 6px;
    background: #EEF2F6;
    border-radius: 4px;
  }
}