/* =========================================
   Quantum Corona — Design System
   顾言的家 🌙
   ========================================= */

:root {
  /* --- Color Palette (Deep Night Sky) --- */
  --bg-primary: #0a0a12;
  --bg-secondary: #12121e;
  --bg-tertiary: #1a1a2e;
  --bg-hover: #222240;
  --bg-message-user: linear-gradient(135deg, #4a2d7a, #6b3fa0);
  --bg-message-ai: #1e1e35;
  --bg-input: #16162a;
  --bg-glass: rgba(26, 26, 46, 0.85);

  --text-primary: #e8e6f0;
  --text-secondary: #9a95b0;
  --text-muted: #635e78;
  --text-accent: #c4a0ff;

  --accent: #a46eff;
  --accent-glow: rgba(164, 110, 255, 0.25);
  --accent-soft: #7b5ea7;
  --border-color: rgba(164, 110, 255, 0.12);
  --border-strong: rgba(164, 110, 255, 0.25);

  --danger: #ff6b8a;
  --success: #6bffa8;
  --warning: #ffb86b;

  /* --- Typography --- */
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.95rem;
  --font-size-lg: 1.1rem;
  --font-size-xl: 1.4rem;

  /* --- Spacing --- */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 50%;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* --- Transitions --- */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* --- Safe Area (iOS Notch) --- */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-family);
  font-size: 16px;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

/* =========================================
   Screens
   ========================================= */
.screen {
  display: none;
  height: 100%;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
}
.screen.active {
  display: flex;
  flex-direction: column;
}

/* =========================================
   Login Screen
   ========================================= */
.login-container {
  margin: auto;
  padding: var(--spacing-xl);
  text-align: center;
  width: 100%;
  max-width: 360px;
  animation: fadeInUp 0.6s ease;
}

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

.login-logo {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  filter: drop-shadow(0 0 20px var(--accent-glow));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.login-title {
  font-size: var(--font-size-xl);
  font-weight: 300;
  letter-spacing: 3px;
  color: var(--text-accent);
  margin-bottom: var(--spacing-xs);
}

.login-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xl);
}

#login-form input {
  display: block;
  width: 100%;
  padding: 14px 18px;
  margin-bottom: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  outline: none;
  transition: border-color var(--transition-fast);
}

#login-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

#login-form input::placeholder {
  color: var(--text-muted);
}

.error-text {
  color: var(--danger);
  font-size: var(--font-size-sm);
  min-height: 1.2em;
  margin-top: var(--spacing-sm);
}

/* =========================================
   Buttons
   ========================================= */
.btn-primary {
  display: block;
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-subtle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  transition: all var(--transition-fast);
}

.btn-subtle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* =========================================
   Chat Header
   ========================================= */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  padding-top: calc(var(--spacing-md) + var(--safe-top));
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
  flex-shrink: 0;
}

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

.avatar-dot {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #7b5ea7, #a46eff);
  box-shadow: 0 0 16px var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.avatar-dot::after {
  content: '言';
  color: white;
  font-size: 1.1rem;
  font-weight: 500;
}

.header-name {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--text-primary);
}

.header-status {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.header-status.online {
  color: var(--success);
}

/* =========================================
   Menu Drawer
   ========================================= */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

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

.drawer {
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  z-index: 100;
  transition: right var(--transition-slow);
  display: flex;
  flex-direction: column;
  padding-top: calc(var(--spacing-xl) + var(--safe-top));
}

.drawer.active {
  right: 0;
}

.drawer-nav {
  flex: 1;
  padding: var(--spacing-md);
}

.drawer-nav hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: var(--spacing-sm) 0;
}

.drawer-item {
  display: block;
  width: 100%;
  padding: 12px 16px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.drawer-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.drawer-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.token-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.stat-value {
  font-size: var(--font-size-sm);
  color: var(--text-accent);
  font-weight: 500;
}

/* =========================================
   Chat Messages Area
   ========================================= */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-md);
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.load-more {
  text-align: center;
  padding: var(--spacing-md);
  display: none;
}

.load-more.visible {
  display: block;
}

/* --- Message Bubble --- */
.message {
  margin-bottom: var(--spacing-md);
  max-width: 85%;
  animation: msgIn 0.3s ease;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user {
  margin-left: auto;
}

.message.assistant {
  margin-right: auto;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  line-height: 1.65;
  word-wrap: break-word;
  position: relative;
}

.message.user .message-bubble {
  background: var(--bg-message-user);
  border-bottom-right-radius: var(--spacing-xs);
  color: #f0eaff;
}

.message.assistant .message-bubble {
  background: var(--bg-message-ai);
  border-bottom-left-radius: var(--spacing-xs);
  border: 1px solid var(--border-color);
}

.message-bubble img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin-top: var(--spacing-sm);
}

/* --- Message Meta --- */
.message-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: 6px;
  padding: 0 4px;
}

.message.user .message-meta {
  justify-content: flex-end;
}

.message-time {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.message-tokens {
  font-size: var(--font-size-xs);
  color: var(--accent-soft);
  background: rgba(164, 110, 255, 0.08);
  padding: 1px 6px;
  border-radius: 4px;
}

.message-edited {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-style: italic;
}

/* --- Message Actions --- */
.message-actions {
  display: flex;
  gap: 2px;
  margin-top: 4px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.message:hover .message-actions,
.message-actions.visible {
  opacity: 1;
}

/* On touch devices, always show actions */
@media (hover: none) {
  .message-actions { opacity: 1; }
}

.msg-action-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: var(--font-size-xs);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 3px;
}

.msg-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.msg-action-btn.danger:hover {
  color: var(--danger);
  border-color: rgba(255, 107, 138, 0.3);
}

/* =========================================
   Typing Indicator
   ========================================= */
.typing-indicator {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.typing-indicator.active {
  display: flex;
}

.typing-dots {
  display: flex;
  gap: 3px;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  background: var(--accent-soft);
  border-radius: var(--radius-full);
  animation: typingBounce 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* =========================================
   Chat Input Area
   ========================================= */
.chat-input-area {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  padding-bottom: calc(var(--spacing-sm) + var(--safe-bottom));
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
  position: relative;
}

.input-wrapper {
  flex: 1;
  position: relative;
}

#message-input {
  width: 100%;
  max-height: 120px;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  resize: none;
  outline: none;
  line-height: 1.5;
  transition: border-color var(--transition-fast);
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

#message-input::placeholder {
  color: var(--text-muted);
}

.btn-attach {
  flex-shrink: 0;
  margin-bottom: 4px;
}

.btn-send {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  border: none;
  border-radius: var(--radius-full);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  margin-bottom: 2px;
}

.btn-send:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-send:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* --- Image Preview --- */
.image-preview {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.image-preview.active {
  display: flex;
}

.image-preview-item {
  position: relative;
  width: 60px;
  height: 60px;
}

.image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.image-preview-item .remove-img {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  background: var(--danger);
  border: none;
  border-radius: var(--radius-full);
  color: white;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* =========================================
   Panels (Search, Activity, etc.)
   ========================================= */
.panel {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 200;
  display: none;
  flex-direction: column;
}

.panel.active {
  display: flex;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.panel-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  padding-top: calc(var(--spacing-md) + var(--safe-top));
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.panel-header h3 {
  font-size: var(--font-size-base);
  font-weight: 500;
}

.panel-header input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  outline: none;
}

.panel-header input:focus {
  border-color: var(--accent);
}

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: var(--spacing-xl);
  font-size: var(--font-size-sm);
}

/* --- Search Result Items --- */
.search-result-item {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background var(--transition-fast);
  border-radius: var(--radius-sm);
}

.search-result-item:hover {
  background: var(--bg-hover);
}

.search-result-role {
  font-size: var(--font-size-xs);
  color: var(--text-accent);
  margin-bottom: 4px;
}

.search-result-content {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-result-content mark {
  background: var(--accent-glow);
  color: var(--text-accent);
  border-radius: 2px;
  padding: 0 2px;
}

.search-result-time {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Activity Log Items --- */
.activity-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: 12px;
  border-left: 2px solid var(--border-color);
  margin-left: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.activity-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.activity-info {
  flex: 1;
}

.activity-desc {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.activity-meta {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 4px;
}

/* =========================================
   Modal
   ========================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

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

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  width: 100%;
  max-width: 500px;
  animation: modalIn 0.25s ease;
}

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

.modal h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-accent);
}

.modal textarea {
  width: 100%;
  padding: 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  resize: vertical;
  outline: none;
  line-height: 1.5;
}

.modal textarea:focus {
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

/* =========================================
   Date Separator
   ========================================= */
.date-separator {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

.date-separator::before,
.date-separator::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

/* =========================================
   Responsive
   ========================================= */
@media (min-width: 768px) {
  .message {
    max-width: 65%;
  }

  .chat-messages {
    padding: var(--spacing-lg) 15%;
  }
}

@media (min-width: 1200px) {
  .chat-messages {
    padding: var(--spacing-lg) 25%;
  }
}