/* ============================================================================
   算子开发效率平台 - 样式表
   设计参考: Linear, Notion, Vercel
   ============================================================================ */

/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #111113;
  --color-bg-tertiary: #18181b;
  --color-bg-hover: #27272a;
  --color-bg-active: #3f3f46;

  --color-border: #27272a;
  --color-border-hover: #3f3f46;
  --color-border-light: #52525b;

  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;

  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-light: rgba(99, 102, 241, 0.15);
  --color-accent-glow: rgba(99, 102, 241, 0.4);

  --color-success: #10b981;
  --color-success-light: rgba(16, 185, 129, 0.15);
  --color-error: #ef4444;
  --color-error-light: rgba(239, 68, 68, 0.15);
  --color-warning: #f59e0b;
  --color-warning-light: rgba(245, 158, 11, 0.15);
  --color-info: #3b82f6;
  --color-info-light: rgba(59, 130, 246, 0.15);

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;

  /* 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);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  /* Layout */
  --header-height: 64px;
  --sidebar-width: 260px;
  --container-max: 1280px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-sm {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ============================================================================
   Header
   ============================================================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.logo-text {
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================================
   Navigation
   ============================================================================ */

.nav {
  display: flex;
  gap: var(--space-2);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.nav-link.active {
  color: var(--color-text-primary);
  background: var(--color-accent-light);
}

/* ============================================================================
   Main Content
   ============================================================================ */

.main {
  padding-top: calc(var(--header-height) + var(--space-10));
  padding-bottom: var(--space-16);
  min-height: 100vh;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-accent);
}

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

.btn-primary {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 2px 8px var(--color-accent-glow);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-accent-glow);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.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-bg-hover);
  border-color: var(--color-border-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

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

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

.btn-danger:hover:not(:disabled) {
  opacity: 0.9;
}

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

.btn-success:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: 13px;
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: 15px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
}

.card-clickable {
  cursor: pointer;
}

.card-clickable:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

/* ============================================================================
   Forms
   ============================================================================ */

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-primary);
}

.form-label.required::after {
  content: ' *';
  color: var(--color-error);
}

.form-helper {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: 14px;
  font-family: inherit;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.form-control::placeholder {
  color: var(--color-text-tertiary);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

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

textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23a1a1aa'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  background-size: 20px;
  padding-right: var(--space-10);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.form-checkbox label {
  flex: 1;
  font-size: 14px;
  color: var(--color-text-primary);
  cursor: pointer;
}

/* Password Toggle */
.password-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-1);
  font-size: 16px;
  transition: color var(--transition-fast);
}

.password-toggle:hover {
  color: var(--color-text-primary);
}

/* ============================================================================
   Grid
   ============================================================================ */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

/* ============================================================================
   Module Cards (Homepage)
   ============================================================================ */

.module-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: linear-gradient(145deg, var(--color-bg-secondary), var(--color-bg-tertiary));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.module-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.module-card:hover::before {
  opacity: 1;
}

.module-icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.module-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.module-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  flex: 1;
}

.module-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
}

/* ============================================================================
   Tabs
   ============================================================================ */

.tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-1);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  position: relative;
  padding: var(--space-3) var(--space-5);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.tab.active {
  color: var(--color-accent);
}

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

/* ============================================================================
   Content Cards (Learning/Query)
   ============================================================================ */

.content-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.content-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.content-icon {
  width: 40px;
  height: 40px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.content-icon:hover {
  background: var(--color-accent-light);
  transform: scale(1.1);
}

.content-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.content-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.content-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* ============================================================================
   Badge
   ============================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  border-radius: 999px;
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
}

.badge-success {
  background: var(--color-success-light);
  color: var(--color-success);
}

.badge-error {
  background: var(--color-error-light);
  color: var(--color-error);
}

.badge-warning {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.badge-info {
  background: var(--color-info-light);
  color: var(--color-info);
}

/* ============================================================================
   Search Box
   ============================================================================ */

.search-box {
  position: relative;
}

.search-box input {
  padding-left: calc(var(--space-4) + 24px);
}

.search-box-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

/* ============================================================================
   Modal
   ============================================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.modal {
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: scale(0.95) translateY(10px);
  transition: all var(--transition-normal);
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-bg-tertiary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 18px;
}

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

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  max-height: 60vh;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

/* ============================================================================
   Toast
   ============================================================================ */

.toast-container {
  position: fixed;
  top: calc(var(--header-height) + var(--space-4));
  right: var(--space-6);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 320px;
  max-width: 480px;
  animation: slideIn var(--transition-normal) ease;
}

@keyframes slideIn {
  from {
    transform: translateX(120%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.success {
  border-left: 3px solid var(--color-success);
}

.toast.error {
  border-left: 3px solid var(--color-error);
}

.toast.warning {
  border-left: 3px solid var(--color-warning);
}

.toast-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
  font-size: 14px;
  color: var(--color-text-primary);
}

/* ============================================================================
   Empty State
   ============================================================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-6);
  color: var(--color-text-tertiary);
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state-text {
  font-size: 16px;
  text-align: center;
}

/* ============================================================================
   Loading & Spinner
   ============================================================================ */

.loading {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-text-tertiary);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ============================================================================
   Log Terminal
   ============================================================================ */

.log-terminal {
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.log-terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: #161b22;
  border-bottom: 1px solid var(--color-border);
}

.log-terminal-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}

.log-terminal-controls {
  display: flex;
  gap: var(--space-2);
}

.log-terminal-body {
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-height: 400px;
  overflow-y: auto;
}

.log-line {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
}

.log-line.error {
  color: var(--color-error);
}

.log-line.success {
  color: var(--color-success);
}

.log-line.warning {
  color: var(--color-warning);
}

.log-timestamp {
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.log-content {
  flex: 1;
}

/* ============================================================================
   History List
   ============================================================================ */

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.history-item:hover {
  border-color: var(--color-border-hover);
}

.history-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.history-server {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-primary);
}

.history-details {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.history-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.history-time {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

/* ============================================================================
   Section
   ============================================================================ */

.section {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.section-actions {
  display: flex;
  gap: var(--space-3);
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.hero {
  text-align: center;
  padding: var(--space-16) 0;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-6);
}

.hero-title-gradient {
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--color-text-tertiary);
}

.hero-feature-icon {
  font-size: 16px;
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .container {
    padding: 0 var(--space-4);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .nav {
    display: none;
  }

  .modal {
    max-width: calc(100% - var(--space-6));
    margin: 0 var(--space-3);
  }

  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
  }

  .toast {
    min-width: auto;
  }
}

/* ============================================================================
   Animations
   ============================================================================ */

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

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

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

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ============================================================================
   Utilities
   ============================================================================ */

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

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

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

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

.text-secondary {
  color: var(--color-text-secondary);
}

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

.text-accent {
  color: var(--color-accent);
}

.text-success {
  color: var(--color-success);
}

.text-error {
  color: var(--color-error);
}

.text-warning {
  color: var(--color-warning);
}

.text-sm {
  font-size: 13px;
}

.text-xs {
  font-size: 12px;
}

.font-mono {
  font-family: var(--font-mono);
}

.flex {
  display: flex;
}

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

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

.flex-wrap {
  flex-wrap: wrap;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.hidden { display: none !important; }
.block { display: block !important; }