/**
 * Project TempRoom - Modern CSS with Dark/Light Mode
 * Mobile-first, responsive design with CSS Custom Properties
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Theme (Default) */
  --color-bg-primary: #0f0f1a;
  --color-bg-secondary: #1a1a2e;
  --color-bg-tertiary: #252542;
  --color-bg-card: #1e1e32;
  
  --color-text-primary: #f0f0f5;
  --color-text-secondary: #b0b0c0;
  --color-text-muted: #707080;
  
  --color-border: #2a2a4a;
  --color-border-light: #3a3a5a;
  
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: rgba(99, 102, 241, 0.1);
  
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.1);
  
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-danger-bg: rgba(239, 68, 68, 0.1);
  
  --color-info: #3b82f6;
  --color-info-bg: rgba(59, 130, 246, 0.1);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-index layers */
  --z-dropdown: 100;
  --z-modal: 200;
  --z-toast: 300;
}

/* Light Theme */
[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-bg-tertiary: #e8e8ed;
  --color-bg-card: #ffffff;
  
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a5e;
  --color-text-muted: #707080;
  
  --color-border: #d0d0e0;
  --color-border-light: #e0e0f0;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::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: var(--font-family);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--spacing-md);
}

/* ============================================
   Layout Components
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  backdrop-filter: blur(10px);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  font-size: var(--font-size-2xl);
}

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

.nav-btn {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* Theme toggle specific */
#theme-toggle .theme-icon-dark {
  display: none;
}

[data-theme="light"] #theme-toggle .theme-icon-light {
  display: none;
}

[data-theme="light"] #theme-toggle .theme-icon-dark {
  display: inline;
}

.main {
  min-height: calc(100vh - 80px);
  padding: var(--spacing-xl) 0;
}

.view {
  display: none;
  animation: fadeIn var(--transition-base);
}

.view.active {
  display: block;
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
}

.highlight {
  color: var(--color-primary);
  background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
}

/* ============================================
   Feature Cards
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   Cards & Forms
   ============================================ */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.card h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

input[type="text"],
input[type="number"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input-large {
  font-size: var(--font-size-lg);
  padding: var(--spacing-lg);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border-light);
}

.btn-danger {
  background: var(--color-danger);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-danger-hover);
}

.btn-icon {
  padding: var(--spacing-sm);
  font-size: var(--font-size-lg);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

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

.btn-large {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-lg);
  width: 100%;
}

/* ============================================
   Result & Error Boxes
   ============================================ */
.result-box,
.error-box {
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-lg);
}

.result-box {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
}

.error-box {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
}

.success-message {
  color: var(--color-success);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.room-info {
  margin-top: var(--spacing-md);
}

.share-link-container {
  display: flex;
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.share-link-input {
  flex: 1;
  font-family: monospace;
  font-size: var(--font-size-sm);
}

/* ============================================
   Chat Interface
   ============================================ */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 80px);
  max-width: 900px;
  margin: 0 auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

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

.chat-room-name {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.online-count {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.online-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.my-alias {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
}

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

.messages-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 80%;
  animation: slideIn var(--transition-base);
}

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

.message.sent {
  align-self: flex-end;
  align-items: flex-end;
}

.message.received {
  align-self: flex-start;
  align-items: flex-start;
}

.message-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.message-content {
  background: var(--color-bg-tertiary);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message.sent .message-content {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
}

.message.received .message-content {
  background: var(--color-bg-tertiary);
  border-bottom-left-radius: var(--radius-sm);
}

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

/* Fade Mode Animation */
.message.fade-out {
  animation: fadeOut 3s forwards;
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0.3;
  }
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.typing-dots .dot {
  width: 6px;
  height: 6px;
  background: var(--color-text-muted);
  border-radius: var(--radius-full);
  animation: typingBounce 1.4s infinite;
}

.typing-dots .dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots .dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px);
  }
}

.chat-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.message-form {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.message-input {
  flex: 1;
  resize: none;
  max-height: 150px;
  min-height: 50px;
}

.send-btn {
  padding: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.message-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
  text-align: center;
}

/* ============================================
   Admin Dashboard
   ============================================ */
.admin-dashboard h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

.admin-login-form {
  max-width: 400px;
}

.admin-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.admin-tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-tab:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.admin-tab.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.admin-panel {
  animation: fadeIn var(--transition-base);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.stat-card {
  background: var(--color-bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.filter-bar {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.table-container {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.data-table th,
.data-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background: var(--color-bg-tertiary);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.data-table tr:hover {
  background: var(--color-bg-tertiary);
}

.retention-form {
  max-width: 500px;
}

/* ============================================
   Modal
   ============================================ */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--spacing-lg);
}

.modal[open] {
  display: flex;
}

.modal-content {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn var(--transition-base);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  line-height: 1;
}

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

.modal-body {
  padding: var(--spacing-lg);
}

.modal-body h3 {
  font-size: var(--font-size-lg);
  margin: var(--spacing-lg) 0 var(--spacing-md);
  color: var(--color-text-primary);
}

.modal-body ul {
  list-style: none;
  padding-left: 0;
}

.modal-body li {
  padding: var(--spacing-xs) 0;
  color: var(--color-text-secondary);
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: right;
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  z-index: var(--z-toast);
  max-width: 400px;
}

.toast {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  animation: toastSlideIn var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-danger);
}

.toast.info {
  border-left: 4px solid var(--color-info);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-muted {
  color: var(--color-text-muted);
}

.text-center {
  text-align: center;
}

.small {
  font-size: var(--font-size-sm);
}

.hidden {
  display: none !important;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .chat-header {
    flex-wrap: wrap;
  }
  
  .my-alias {
    display: none;
  }
  
  .admin-nav {
    flex-direction: column;
  }
  
  .admin-tab {
    width: 100%;
    text-align: left;
  }
  
  .toast-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
    max-width: none;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-base: 0.875rem;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .share-link-container {
    flex-direction: column;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .header,
  .nav,
  .chat-footer,
  .btn,
  .toast-container {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
}