/* ============================================================
   嘟可唠 - 码泓科技全平台UI设计体系
   浅色专业风格版 V1.1
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-brand: #0088FF;
  --color-brand-hover: #0077E6;
  --color-brand-active: #0066CC;
  --color-brand-secondary: #5AC8FA;
  --color-bg: #F5F5F5;
  --color-card: #FFFFFF;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-border: #E8E8E8;
  --color-success: #34C759;
  --color-warning: #FF9500;
  --color-danger: #FF3B30;

  --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-modal: 0 16px 48px rgba(0, 0, 0, 0.16);

  --radius-card: 10px;
  --radius-button: 24px;
  --radius-input: 12px;
  --radius-small: 6px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'HarmonyOS Sans', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-brand);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-brand-hover);
}

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

ul, ol {
  list-style: none;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================================
   Header / Navigation
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.header.scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

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

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.logo span {
  color: var(--color-text-primary);
}

.nav-tabs {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-tab {
  position: relative;
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.2s ease;
  background: none;
  border: none;
  font-family: var(--font-family);
}

.nav-tab:hover,
.nav-tab.active {
  color: var(--color-brand);
}

.nav-tab.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-brand);
  border-radius: 1px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 24px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: var(--font-family);
  border: none;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-text-primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #333333;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary:active {
  background: #000000;
  transform: translateY(0);
}

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

.btn-primary-blue:hover {
  background: var(--color-brand-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 136, 255, 0.25);
}

.btn-primary-blue:active {
  background: var(--color-brand-active);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-brand);
  padding: 8px 16px;
}

.btn-ghost:hover {
  background: rgba(0, 136, 255, 0.06);
}

.btn-sm {
  padding: 6px 16px;
  font-size: var(--font-size-xs);
}

/* ============================================================
   Hero Section (两栏布局)
   ============================================================ */
.hero-section {
  padding: calc(var(--header-height) + var(--spacing-3xl)) 0 var(--spacing-2xl);
  background: linear-gradient(180deg, #FAFCFF 0%, var(--color-bg) 100%);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

/* Left: Brand */
.hero-brand {
  max-width: 540px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 4px 14px;
  background: linear-gradient(135deg, rgba(0, 136, 255, 0.1), rgba(90, 200, 250, 0.1));
  border: 1px solid rgba(0, 136, 255, 0.15);
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-brand);
  margin-bottom: var(--spacing-lg);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

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

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 2px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.hero-link:hover {
  color: var(--color-brand);
  border-bottom-color: var(--color-brand);
}

/* Right: Login Card */
.login-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-2xl) var(--spacing-xl);
  text-align: center;
  max-width: 380px;
  margin: 0 auto;
  width: 100%;
}

.login-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.login-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* QR 扫码区域（Hero右侧卡片内置） */
.qr-container {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.qr-code-wrapper {
  width: 180px;
  height: 180px;
  margin: 0 auto var(--spacing-sm);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.qr-code-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qr-code-icon {
  position: absolute;
  font-size: 64px;
  opacity: 0.25;
}

.qr-hint-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--spacing-xs);
}

.qr-placeholder {
  width: 180px;
  height: 180px;
  margin: 0 auto var(--spacing-lg);
  background: var(--color-bg);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-small);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.qr-placeholder .qr-icon {
  font-size: 48px;
  opacity: 0.4;
}

.qr-placeholder .qr-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.qr-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qr-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-lg);
}

.login-card-footer {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.login-card-footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

.login-card-footer a:hover {
  color: var(--color-brand);
}

/* ============================================================
   Demo Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--color-card);
  border-radius: 16px;
  box-shadow: var(--shadow-modal);
  padding: var(--spacing-2xl);
  max-width: 520px;
  width: 90%;
  position: relative;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.35s ease, opacity 0.3s ease;
  opacity: 0;
}

.modal-overlay.active .modal-content {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: #E0E0E0;
  color: var(--color-text-primary);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.modal-body {
  max-height: 60vh;
  overflow-y: auto;
}

/* Demo Messages */
.demo-messages {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.demo-msg {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 85%;
}

.demo-msg.ai {
  align-self: flex-start;
}

.demo-msg.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.demo-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.demo-msg.ai .demo-msg-avatar {
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-secondary));
  color: #fff;
}

.demo-msg.user .demo-msg-avatar {
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.demo-msg-bubble {
  padding: 10px 16px;
  border-radius: 16px;
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.demo-msg.ai .demo-msg-bubble {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-bottom-left-radius: 4px;
}

.demo-msg.user .demo-msg-bubble {
  background: var(--color-brand);
  color: #FFFFFF;
  border-bottom-right-radius: 4px;
}

/* ============================================================
   Scenarios Section
   ============================================================ */
.scenarios-section {
  padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.section-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.scenario-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.scenario-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-xl);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.scenario-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.scenario-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--spacing-md);
}

.scenario-card-icon.chat {
  background: linear-gradient(135deg, rgba(0, 136, 255, 0.1), rgba(90, 200, 250, 0.1));
}

.scenario-card-icon.gov {
  background: linear-gradient(135deg, rgba(52, 199, 89, 0.1), rgba(52, 199, 89, 0.05));
}

.scenario-card-icon.med {
  background: linear-gradient(135deg, rgba(255, 149, 0, 0.1), rgba(255, 149, 0, 0.05));
}

.scenario-card-icon.edu {
  background: linear-gradient(135deg, rgba(0, 136, 255, 0.1), rgba(136, 86, 255, 0.1));
}

.scenario-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.scenario-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--spacing-md);
}

.scenario-card-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-brand);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.scenario-card-link .arrow {
  transition: transform 0.2s ease;
}

.scenario-card:hover .scenario-card-link .arrow {
  transform: translateX(4px);
}

/* More Scenarios (collapsed) */
.more-scenarios {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.more-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-family);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-button);
  transition: all 0.2s ease;
}

.more-toggle:hover {
  background: var(--color-card);
  color: var(--color-brand);
}

.more-toggle .icon {
  transition: transform 0.3s ease;
}

.more-toggle.open .icon {
  transform: rotate(180deg);
}

.more-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
  opacity: 0;
}

.more-grid.open {
  max-height: 600px;
  opacity: 1;
}

.scenario-card-mini {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.scenario-card-mini:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.scenario-card-mini .icon {
  font-size: 32px;
  margin-bottom: var(--spacing-sm);
}

.scenario-card-mini .label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.scenario-card-mini .coming-soon {
  display: inline-block;
  margin-top: var(--spacing-xs);
  padding: 2px 8px;
  background: rgba(255, 149, 0, 0.1);
  color: var(--color-warning);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: 10px;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.footer-top-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

.footer-brand span {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer-link {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--color-brand);
}

.footer-link-divider {
  width: 1px;
  height: 12px;
  background: var(--color-border);
}

.footer-icp {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.footer-icp a {
  color: var(--color-text-tertiary);
  text-decoration: none;
}

.footer-icp a:hover {
  color: var(--color-brand);
  text-decoration: underline;
}

/* ============================================================
   Welcome Message (动态问候)
   ============================================================ */
.welcome-bar {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.welcome-bar .avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: #fff;
  flex-shrink: 0;
}

/* ============================================================
   Chat Page Styles (dukelao.mahong.tech)
   ============================================================ */
.chat-layout {
  display: flex;
  height: calc(100vh - var(--header-height));
  padding-top: var(--header-height);
}

.chat-sidebar {
  width: 280px;
  border-right: 1px solid var(--color-border);
  background: var(--color-card);
  display: flex;
  flex-direction: column;
}

.chat-sidebar-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.chat-new-btn {
  width: 100%;
  padding: 10px;
  background: var(--color-brand);
  color: #fff;
  border: none;
  border-radius: var(--radius-button);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-family);
  transition: background 0.2s ease;
}

.chat-new-btn:hover {
  background: var(--color-brand-hover);
}

.chat-history-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.chat-history-item {
  padding: 10px 12px;
  border-radius: var(--radius-small);
  cursor: pointer;
  transition: background 0.2s ease;
  margin-bottom: 2px;
}

.chat-history-item:hover {
  background: var(--color-bg);
}

.chat-history-item.active {
  background: rgba(0, 136, 255, 0.06);
}

.chat-history-item .title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-history-item .preview {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.message {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 75%;
}

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

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

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.message.ai .message-avatar {
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-secondary));
  color: #fff;
}

.message.user .message-avatar {
  background: var(--color-text-secondary);
  color: #fff;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.message.ai .message-bubble {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-bottom-left-radius: 4px;
}

.message.user .message-bubble {
  background: var(--color-brand);
  color: #FFFFFF;
  border-bottom-right-radius: 4px;
}

.chat-input-area {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-sm);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-input);
  padding: 8px 12px;
  transition: border-color 0.2s ease;
}

.chat-input-wrapper:focus-within {
  border-color: var(--color-brand);
}

.chat-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  color: var(--color-text-primary);
  outline: none;
  resize: none;
  min-height: 24px;
  max-height: 120px;
  line-height: 1.5;
}

.chat-input::placeholder {
  color: var(--color-text-tertiary);
}

.chat-send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-brand);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.chat-send-btn:hover {
  background: var(--color-brand-hover);
  transform: scale(1.05);
}

.chat-send-btn:disabled {
  background: var(--color-border);
  cursor: not-allowed;
  transform: none;
}

/* ============================================================
   Company Page Styles (cp.mahong.tech)
   ============================================================ */
.company-hero {
  padding: calc(var(--header-height) + var(--spacing-3xl)) 0 var(--spacing-2xl);
  background: linear-gradient(135deg, #FAFCFF, #F0F7FF);
  text-align: center;
}

.company-hero h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.company-hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto var(--spacing-xl);
}

.company-section {
  padding: var(--spacing-2xl) 0;
}

.company-section-alt {
  background: var(--color-card);
}

.company-section h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.company-section p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto;
}

.company-product-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-xl);
  max-width: 800px;
  margin: var(--spacing-lg) auto;
  text-align: center;
}

.company-product-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-brand);
  margin-bottom: var(--spacing-sm);
}

.company-product-card p {
  margin-bottom: var(--spacing-lg);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 968px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .hero-brand {
    max-width: 100%;
    text-align: center;
  }

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

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .login-card {
    max-width: 360px;
  }

  .chat-sidebar {
    width: 220px;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: var(--font-size-xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

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

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

  .nav-tabs {
    display: none;
  }

  .header-left {
    gap: var(--spacing-md);
  }

  .chat-sidebar {
    display: none;
  }

  .message {
    max-width: 90%;
  }

  .hero-section {
    padding-top: calc(var(--header-height) + var(--spacing-2xl));
  }
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }
.animate-in-delay-4 { animation-delay: 0.4s; }

/* ============================================================
   Loading Spinner
   ============================================================ */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-brand);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--color-text-primary);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-button);
  font-size: var(--font-size-sm);
  font-weight: 500;
  z-index: 3000;
  opacity: 0;
  transition: all 0.35s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   Utility
   ============================================================ */
.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }