:root {
    --primary-color: #7aa2ff;
    --secondary-color: #5b87f7;
    --bg-color: #0b0b10;
    --text-color: #e6e7eb;
    --light-text: #9aa0a6;
    --border-color: #2a2d33;
    --message-bg: #11131a;
    --user-message-bg: #1b2440;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --overlay-bg: rgba(0, 0, 0, 0.6);
    --login-bg: #0e1016;
}

:root.dark-theme {
    --primary-color: #7aa2ff;
    --secondary-color: #5b87f7;
    --bg-color: #0b0b10;
    --text-color: #e6e7eb;
    --light-text: #9aa0a6;
    --border-color: #2a2d33;
    --message-bg: #11131a;
    --user-message-bg: #1b2440;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --login-bg: #0e1016;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transition: opacity 220ms ease;
}

html.page-ready body { opacity: 1; }

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

header {
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    width: 100%;
    max-width: 1200px;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    font-size: 1.35rem;
    color: var(--text-color);
    letter-spacing: 0.3px;
}

.logo i { display: none; }
.logo svg { width: 24px; height: 24px; }
.logo .brand-cn { font-weight: 500; }

/* Navigation dropdown - mobile only */
.nav-dropdown {
    position: relative;
    display: none;
}

.nav-dropdown-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-dropdown-toggle:hover {
    border-color: var(--primary-color);
    background-color: rgba(122, 162, 255, 0.1);
}

.nav-dropdown-toggle i {
    transition: transform 0.3s ease;
}

.nav-dropdown.open .nav-dropdown-toggle i {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--login-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 8px;
    margin-top: 4px;
    display: none;
    z-index: 1100;
}

.nav-dropdown.open .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu a {
    display: block;
    padding: 10px 12px;
    text-decoration: none;
    color: var(--light-text);
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu a.active {
    color: var(--text-color);
    background-color: rgba(122, 162, 255, 0.1);
}

/* Desktop navigation - horizontal */
nav {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    overflow: hidden;
}

nav a {
    margin: 0 16px;
    text-decoration: none;
    color: var(--light-text);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* theme-toggle removed */

.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--light-text);
    padding: 6px 10px;
    border-radius: 10px;
    cursor: pointer;
}

/* theme-toggle removed */

.page-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2.5rem;
    font-weight: 700;
}

.about-section {
    display: block;
    margin-top: 3rem;
}

.about-content { width: 100%; }

.about-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.about-content p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-image { display: none; }

/* Client Grid */
.client-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.client-item {
    background-color: var(--message-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.client-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border-color: rgba(122, 162, 255, 0.4);
}

.client-logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    color: white;
    font-size: 1.5rem;
}

.client-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--text-color);
}

.client-details {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.client-count {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.client-metric {
    font-size: 0.8rem;
    color: var(--light-text);
    font-weight: 500;
}

.stat-desc {
    font-size: 0.75rem;
    color: var(--light-text);
    margin-top: 4px;
    opacity: 0.8;
}

.tech-capabilities {
    margin-top: 32px;
}

.tech-capabilities h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-color);
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.capability-item {
    background-color: var(--message-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.capability-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    border-color: rgba(122, 162, 255, 0.5);
}

.capability-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.capability-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--text-color);
}

.capability-item p {
    color: var(--light-text);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* Tech Stats */
.tech-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-item {
    background-color: var(--message-bg);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    border-color: rgba(122, 162, 255, 0.5);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    color: var(--light-text);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Team Highlights */
.team-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 20px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(122, 162, 255, 0.1);
    border: 1px solid rgba(122, 162, 255, 0.3);
    border-radius: 20px;
    padding: 8px 16px;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.highlight-item i {
    color: var(--primary-color);
    font-size: 1rem;
}

/* WeChat popover */
.wechat-pop { position: relative; }
.wechat-pop-inner { position: fixed; right: 24px; top: 96px; background: var(--login-bg); border:1px solid var(--border-color); border-radius: 12px; box-shadow: var(--shadow); padding: 12px; z-index: 1200; }
.wechat-pop-arrow { position: absolute; right: 18px; top: -8px; width: 16px; height: 16px; background: var(--login-bg); border-left:1px solid var(--border-color); border-top:1px solid var(--border-color); transform: rotate(45deg); }
.wechat-pop img { width: 240px; height: auto; display: block; border-radius: 8px; }
.wechat-pop-tip { text-align: center; color: var(--light-text); margin-top: 8px; font-size: 0.9rem; }

.cta-button {
    background-color: var(--primary-color);
    color: var(--bg-color);
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius-medium);
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--primary-color-dark);
}

/* Feature Cards */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

/* Case Studies */
.case-studies {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.case-study {
    background-color: var(--message-bg);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.case-study:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    border-color: rgba(122, 162, 255, 0.4);
}

.case-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.case-logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.case-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 4px 0;
    color: var(--text-color);
}

.case-industry {
    color: var(--light-text);
    font-size: 0.9rem;
    margin: 0;
}

.case-content p {
    margin-bottom: 12px;
    line-height: 1.6;
    color: var(--light-text);
}

.case-content p:last-child {
    margin-bottom: 0;
}

/* Product Showcase */
.product-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.product-item {
    background-color: var(--message-bg);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
    border-color: rgba(122, 162, 255, 0.5);
}

.product-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.product-item h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-color);
}

.product-item p {
    color: var(--light-text);
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.product-stats {
    display: flex;
    justify-content: space-around;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--light-text);
    font-weight: 500;
}

.feature-card {
    background-color: var(--message-bg);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    text-align: left;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Polished cards and hovers */
.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
    border-color: rgba(122, 162, 255, 0.55);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0;
    align-self: flex-start;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0;
}

.feature-card p {
    color: var(--light-text);
    font-size: 1rem;
    line-height: 1.7;
}

.faq-section {
    max-width: 800px;
    width: 100%;
    margin: 0 auto 48px;
}

.faq-item {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0;
}

.faq-question {
    padding: 24px 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.faq-question i {
    transition: transform 0.3s;
    color: var(--light-text);
}

.faq-answer {
    padding: 0 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
    color: var(--light-text);
}

footer {
    text-align: center;
    padding: 24px 0;
    margin-top: 48px;
    border-top: 1px solid var(--border-color);
    color: var(--light-text);
    font-size: 0.9rem;
    width: 100%;
    max-width: 1200px;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 220px);
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--bg-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

/* Chat wrapper to replace iframe */
.chat-wrapper {
    position: relative;
    width: 100%;
    flex: 1;
    min-height: 700px;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chat-message {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    max-width: 80%;
}

.ai-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
}

.message-content {
    padding: 12px 18px;
    border-radius: var(--border-radius);
    line-height: 1.5;
    word-wrap: break-word;
}

.ai-message .message-content {
    background-color: var(--message-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.user-message .message-content {
    background-color: var(--primary-color);
    color: white;
}

.message-time {
    font-size: 0.75rem;
    color: var(--light-text);
    margin-top: 4px;
    padding: 0 8px;
}

.ai-message .message-time {
    text-align: left;
}

.user-message .message-time {
    text-align: right;
}

.chat-input-container {
    display: flex;
    padding: 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
    gap: 16px;
}

#chat-input {
    flex: 1;
    padding: 14px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    resize: none;
    background-color: var(--message-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.2);
}

#send-button {
    background-image: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 0 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s;
}

#send-button:hover {
    filter: brightness(1.05);
}

/* Login form styles removed */

/* AI Doctor iframe styles */
#ai-doctor-wrapper { width: 100%; height: 100%; min-height: 820px; border-radius: var(--border-radius-lg); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--border-color); }
#ai-doctor-wrapper iframe { width: 100%; height: 100%; min-height: 820px; border: none; border-radius: var(--border-radius-lg); }

/* Other roles wrapper */
#other-roles-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.role-selection {
    margin: 8px auto 16px;
    display: flex;
    justify-content: flex-start;
    max-width: 1200px;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 8px;
}

.role-tabs {
    display: flex;
    gap: 6px;
    background-color: var(--message-bg);
    padding: 6px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    min-width: max-content;
    flex-shrink: 0;
}

.role-tab {
    padding: 12px 16px;
    cursor: pointer;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.3s ease;
    color: var(--light-text);
    white-space: nowrap;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.role-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s ease;
}

.role-tab:hover::before {
    left: 100%;
}

.role-tab:hover {
    background-color: rgba(122, 162, 255, 0.14);
    color: var(--text-color);
    transform: translateY(-1px);
}

.role-tab.active {
    background-color: var(--primary-color);
    color: #0b0b10;
    box-shadow: 0 6px 16px rgba(122, 162, 255, 0.35);
    transform: translateY(-2px);
}

.role-tab.active::before {
    display: none;
}

/* Login cover styles removed */

/* Login modal and user menu styles removed */

.header-actions { display:flex; align-items:center; gap:10px; position: relative; }

@media (max-width: 900px) {
  header { padding: 16px 0; position: relative; z-index: 1200; }
  nav { display: none; }
  .nav-dropdown { display: inline-block; width: 100%; }
  .nav-dropdown-toggle { width: 100%; justify-content: space-between; }
  .nav-dropdown-menu { width: 100%; z-index: 1200; }
  .page-title { font-size: 2rem; }
  .feature-cards { grid-template-columns: 1fr; gap: 20px; }
  .case-studies { grid-template-columns: 1fr; gap: 20px; }
  .product-showcase { grid-template-columns: 1fr; gap: 20px; }
  .client-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .tech-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .capability-grid { grid-template-columns: 1fr; gap: 16px; }
  .team-highlights { flex-direction: column; gap: 12px; }
  .about-section { flex-direction: column; gap: 1.5rem; }
  .chat-container { height: auto; min-height: 70vh; }
  .modal-backdrop { z-index: 1000; }
  
  /* Mobile role selection optimization */
  .role-selection {
    margin: 8px 16px 20px;
    padding: 0 4px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .role-selection::-webkit-scrollbar {
    display: none;
  }
  
  .role-tabs {
    gap: 4px;
    padding: 4px;
    min-width: max-content;
  }
  
  .role-tab {
    padding: 10px 12px;
    font-size: 0.85rem;
    min-width: fit-content;
    flex-shrink: 0;
  }
  
  .role-tab:hover {
    transform: none;
  }
  
  .role-tab.active {
    transform: none;
  }
}

/* Extra small screens optimization */
@media (max-width: 480px) {
  .role-selection {
    margin: 8px 12px 16px;
    padding: 0 2px;
  }
  
  .role-tabs {
    gap: 3px;
    padding: 3px;
  }
  
  .role-tab {
    padding: 8px 10px;
    font-size: 0.8rem;
    border-radius: 8px;
  }
  
  .chat-container {
    margin: 0 12px;
    border-radius: 16px;
  }
  
  .chat-messages {
    padding: 16px;
  }
  
  .chat-input-container {
    padding: 16px;
  }
  
  #chat-input {
    padding: 12px 16px;
    font-size: 0.9rem;
  }
  
  #send-button {
    padding: 0 20px;
  }
}

/* Mobile-optimized body styles */
body.mobile-optimized {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body.mobile-optimized .role-tab {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* Smooth scrolling for role selection */
.role-selection {
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
}

.role-tab {
  scroll-snap-align: center;
}

/* Enhanced touch feedback */
@media (hover: none) and (pointer: coarse) {
  .role-tab:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
  }
  
  .role-tab.active:active {
    transform: scale(0.95);
  }
}

/* =========================================
   Breathing Space & Typography Enhancements
   ========================================= */
/* Base */
body { line-height: 1.75; }

/* Layout */
.container { max-width: 1280px; padding: 0 32px; }
header { padding: 32px 0; margin-bottom: 40px; max-width: 1280px; gap: 16px; }
nav a { margin: 0 20px; }

/* Hero and titles */
.hero { padding: 32px 0 16px; }
.subtitle { max-width: 880px; margin: 12px auto 0; color: var(--light-text); line-height: 1.9; text-align: center; }
.section-title { font-size: 1.75rem; font-weight: 700; margin: 56px 0 24px; text-align: center; }
.page-title { margin-bottom: 2.5rem; }

/* About */
.about-section { margin-top: 4rem; }

/* Clients */
.client-grid { gap: 28px; margin-bottom: 40px; }
.client-item { padding: 24px; }

/* Capabilities & stats */
.tech-capabilities { margin-top: 40px; }
.capability-grid { gap: 28px; }
.capability-item { padding: 24px; }
.tech-stats { gap: 28px; margin-bottom: 40px; }
.stat-item { padding: 28px; }
.team-highlights { gap: 20px; margin-top: 28px; }

/* FAQ */
.faq-section { margin: 0 auto 64px; }
.faq-question { padding: 28px 0; }
.faq-answer { padding: 0 0 28px; }

/* Footer */
footer { padding: 32px 0; margin-top: 64px; max-width: 1280px; }

/* Chat */
.chat-container { max-width: 1200px; }
.chat-messages { padding: 28px; gap: 20px; }
.message-content { padding: 14px 20px; line-height: 1.6; }
.chat-input-container { padding: 28px; gap: 20px; }
#chat-input { padding: 16px 20px; }

/* Roles */
.role-selection { margin: 16px auto 24px; max-width: 1200px; }
.role-tabs { gap: 8px; padding: 8px; }
.role-tab { padding: 12px 18px; }
/* Dual pane layout */
.dual-pane { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 16px; height: 100%; }
.pane { display: flex; flex-direction: column; min-height: 0; }
.left-pane .chat-wrapper, .right-pane .chat-wrapper { flex: 1; }

@media (max-width: 900px) {
  #ai-doctor-wrapper { min-height: 700px; }
  #ai-doctor-wrapper iframe { min-height: 700px; }
  .chat-container { height: auto; min-height: 70vh; }
}

/* AIRPA 合同卫士 UI 强化 */
.airpa-shell { padding: 20px; }
.airpa-header { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.airpa-title { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; }
.airpa-title i { color: var(--primary-color); }
.badge { background: rgba(122,162,255,0.15); color: var(--text-color); border: 1px solid rgba(122,162,255,0.4); padding: 2px 8px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.airpa-subtitle { color: var(--light-text); font-size: 0.95rem; }
.airpa-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.airpa-card { background: var(--message-bg); border: 1px solid var(--border-color); border-radius: var(--border-radius-lg); padding: 16px; box-shadow: var(--shadow); }
.airpa-card-title { font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.airpa-form { display: flex; flex-direction: column; gap: 12px; }
.airpa-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.airpa-field { display: flex; flex-direction: column; gap: 6px; }
.airpa-label { font-weight: 600; font-size: 0.95rem; }
.airpa-drop { position: relative; border: 1px dashed rgba(122,162,255,0.5); border-radius: 12px; padding: 16px; background: rgba(122,162,255,0.06); display: flex; flex-direction: column; align-items: center; gap: 8px; }
.airpa-drop input[type="file"] { width: 100%; }
.airpa-drop-hint { color: var(--light-text); font-size: 0.9rem; }
.airpa-actions { display: flex; align-items: center; gap: 12px; }
.airpa-actions .status { color: var(--light-text); }
.airpa-result { min-height: 240px; max-height: 520px; overflow: auto; border-radius: 12px; border: 1px solid var(--border-color); background: rgba(0,0,0,0.15); padding: 12px; }
.hint { color: var(--light-text); font-size: 0.8rem; }

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

/* 开发中横幅 */
.dev-banner { display: flex; align-items: center; gap: 8px; padding: 10px 14px; margin: 12px; border-radius: 10px; border: 1px dashed rgba(122,162,255,0.5); color: var(--light-text); }

/* Product & features */
.feature-cards { gap: 36px; margin-bottom: 64px; }
.case-studies { gap: 32px; margin-bottom: 56px; }
.case-study { padding: 28px; }
.product-showcase { gap: 32px; margin-bottom: 56px; }
.product-item { padding: 36px; }
.product-features { gap: 10px; }
.product-stats { margin-top: 20px; padding-top: 20px; }

/* Feature tags */
.feature-tag { padding: 6px 12px; border-radius: 999px; background-color: rgba(122, 162, 255, 0.12); border: 1px solid rgba(122, 162, 255, 0.25); color: var(--text-color); font-size: 0.85rem; font-weight: 500; }

/* Agent page full-height adjustments */
.chat-container { height: auto; min-height: 78vh; }
#ai-doctor-wrapper { min-height: 820px; }
#ai-doctor-wrapper iframe { min-height: 820px; }
@media (max-width: 900px) {
  .chat-container { min-height: 70vh; }
  #ai-doctor-wrapper, #ai-doctor-wrapper iframe { min-height: 700px; }
}