/**
 * Main Stylesheet for Manus.im Clone
 * 
 * Based on the comprehensive CSS documentation
 */

/* ==========================================================================
   CSS Custom Properties / Variables
   ========================================================================== */

:root {
  /* Primary Colors */
  --color-primary: #007bff;
  --color-primary-dark: #0056b3;
  --color-primary-light: #3395ff;
  
  /* Secondary Colors */
  --color-secondary: #6c757d;
  --color-secondary-dark: #5a6268;
  --color-secondary-light: #868e96;
  
  /* Status Colors */
  --color-success: #28a745;
  --color-error: #dc3545;
  --color-warning: #ffc107;
  --color-info: #17a2b8;
  
  /* Grays */
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;
  
  /* Black and White */
  --color-black: #000000;
  --color-white: #ffffff;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f4f4f4;
  --bg-dark: #333333;
  --bg-sidebar: #2c3e50;
  
  /* Text Colors */
  --text-primary: var(--color-gray-900);
  --text-secondary: var(--color-gray-600);
  --text-muted: var(--color-gray-500);
  --text-light: var(--color-white);
  
  /* Border Colors */
  --border-color: var(--color-gray-300);
  --border-color-dark: var(--color-gray-400);
  
  /* Shadow Colors */
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-color-dark: rgba(0, 0, 0, 0.2);
  
  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 
                  'Helvetica Neue', Arial, sans-serif;
  --font-monospace: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', 
                    Consolas, 'Courier New', monospace;
  
  /* Font Sizes */
  --font-size-base: 16px;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-md: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Spacing */
  --spacing-xs: 0.25rem;  /* 4px */
  --spacing-sm: 0.5rem;   /* 8px */
  --spacing-md: 1rem;     /* 16px */
  --spacing-lg: 1.5rem;   /* 24px */
  --spacing-xl: 2rem;     /* 32px */
  --spacing-2xl: 3rem;    /* 48px */
  --spacing-3xl: 4rem;    /* 64px */
  
  /* Breakpoints */
  --breakpoint-xs: 0;
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;
}

/* ==========================================================================
   Base Styles / Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

body {
  margin: 0;
  font-family: var(--font-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
}

h1, .h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

h2, .h2 {
  font-size: var(--font-size-3xl);
}

h3, .h3 {
  font-size: var(--font-size-2xl);
}

h4, .h4 {
  font-size: var(--font-size-xl);
}

h5, .h5 {
  font-size: var(--font-size-lg);
}

h6, .h6 {
  font-size: var(--font-size-md);
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

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

.app-container {
  display: flex;
  min-height: 100vh;
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 250px;
  height: 100vh;
  background-color: var(--bg-sidebar);
  color: var(--text-light);
  padding: var(--spacing-lg);
  overflow-y: auto;
  z-index: 100;
}

.sidebar__logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.sidebar__nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar__nav-item {
  margin-bottom: var(--spacing-sm);
}

.sidebar__nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-light);
  text-decoration: none;
  border-radius: 0.25rem;
  transition: background-color 0.2s ease-in-out;
}

.sidebar__nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.sidebar__nav-link--active {
  background-color: rgba(255, 255, 255, 0.2);
}

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

.main-content {
  flex: 1;
  margin-left: 250px;
  min-height: 100vh;
  padding: var(--spacing-xl);
  background-color: var(--bg-secondary);
}

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

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-white);
  border-radius: 0.5rem;
  margin-bottom: var(--spacing-xl);
  box-shadow: 0 2px 4px var(--shadow-color);
}

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

.header__credits {
  background-color: var(--color-warning);
  color: var(--color-gray-900);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 1rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.header__avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  color: var(--color-white);
  background-color: var(--color-primary);
  border: 1px solid transparent;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 6px var(--shadow-color);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px var(--shadow-color);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

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

.btn--secondary:hover {
  background-color: var(--color-secondary-dark);
}

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

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

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

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

.btn--sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

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

.btn--full {
  width: 100%;
}

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

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

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

.form-input {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-sm);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--color-white);
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-input:focus {
  outline: 0;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-input:disabled {
  background-color: var(--color-gray-100);
  opacity: 0.65;
}

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

/* ==========================================================================
   Task Input
   ========================================================================== */

.task-input {
  background-color: var(--color-white);
  border-radius: 0.5rem;
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  box-shadow: 0 2px 4px var(--shadow-color);
}

.task-input__textarea {
  width: 100%;
  min-height: 120px;
  padding: var(--spacing-md);
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  border: 2px solid var(--border-color);
  border-radius: 0.25rem;
  resize: vertical;
  transition: border-color 0.2s ease-in-out;
}

.task-input__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.task-input__options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.task-input__option {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  background-color: var(--color-gray-200);
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

.task-input__option:hover {
  background-color: var(--color-gray-300);
  border-color: var(--border-color-dark);
}

.task-input__option--active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

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

.card {
  background-color: var(--color-white);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px var(--shadow-color);
  overflow: hidden;
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow-color);
}

.card__header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--color-gray-100);
}

.card__title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.card__body {
  padding: var(--spacing-md);
}

.card__footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  background-color: var(--color-gray-100);
}

.card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

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

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.content-card {
  background-color: var(--color-white);
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 2px 4px var(--shadow-color);
  transition: all 0.3s ease-in-out;
  cursor: pointer;
}

.content-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px var(--shadow-color-dark);
}

.content-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-gray-200);
}

.content-card__body {
  padding: var(--spacing-md);
}

.content-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.content-card__description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.content-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.content-card__category {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 0.25rem;
  font-weight: var(--font-weight-medium);
}

/* ==========================================================================
   Alerts
   ========================================================================== */

.alert {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 0.25rem;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  border: 1px solid transparent;
}

.alert-error {
  background-color: #f8d7da;
  color: #721c24;
  border-color: #f5c6cb;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border-color: #c3e6cb;
}

.alert-warning {
  background-color: #fff3cd;
  color: #856404;
  border-color: #ffeeba;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
  border-color: #bee5eb;
}

/* ==========================================================================
   Loading States
   ========================================================================== */

.spinner {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--color-gray-300);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner--sm {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

.spinner--lg {
  width: 3rem;
  height: 3rem;
  border-width: 4px;
}

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

.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: loading 1.5s infinite;
}

@keyframes loading {
  to {
    left: 100%;
  }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

/* Display */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }

/* Flexbox */
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }

/* Spacing */
.m-0 { margin: 0 !important; }
.m-auto { margin: auto !important; }
.mt-sm { margin-top: var(--spacing-sm) !important; }
.mt-md { margin-top: var(--spacing-md) !important; }
.mt-lg { margin-top: var(--spacing-lg) !important; }
.mb-sm { margin-bottom: var(--spacing-sm) !important; }
.mb-md { margin-bottom: var(--spacing-md) !important; }
.mb-lg { margin-bottom: var(--spacing-lg) !important; }

.p-0 { padding: 0 !important; }
.p-sm { padding: var(--spacing-sm) !important; }
.p-md { padding: var(--spacing-md) !important; }
.p-lg { padding: var(--spacing-lg) !important; }

/* Text */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-muted { color: var(--text-muted) !important; }
.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

@media (max-width: 991px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
  }
  
  .sidebar--open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .content-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 767px) {
  :root {
    --font-size-base: 14px;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header {
    padding: var(--spacing-md);
  }
  
  .main-content {
    padding: var(--spacing-md);
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .task-input__options {
    justify-content: stretch;
  }
  
  .task-input__option {
    flex: 1;
    text-align: center;
  }
  
  .d-md-none { display: none !important; }
  .d-md-block { display: block !important; }
  .d-md-flex { display: flex !important; }
}

@media (max-width: 375px) {
  .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
}

/* ==========================================================================
   Dark Theme Support (Future Enhancement)
   ========================================================================== */

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-sidebar: #0f0f0f;
  
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --text-muted: #707070;
  
  --border-color: #404040;
  --border-color-dark: #505050;
  
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-color-dark: rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .sidebar,
  .header,
  .btn,
  .task-input,
  .no-print {
    display: none !important;
  }
  
  .main-content {
    margin: 0;
    padding: 0;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
    color: black;
    background: white;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
  }
}