/* ===================================
   Main Stylesheet - Global Styles
   =================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-primary-light: #6366F1;
    
    --color-bg-dark: #1E1E2E;
    --color-bg-medium: #2D2D3D;
    --color-bg-light: #3D3D4D;
    
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A0A0B0;
    --color-text-muted: #6B6B7B;
    
    --color-canvas-bg: #F5F5F5;
    --color-grid: #E0E0E0;
    
    --color-success: #22C55E;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* Z-Index layers */
    --z-canvas: 1;
    --z-toolbar: 100;
    --z-modal: 200;
    --z-tooltip: 300;
}

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

/* Base */
html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-bg-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background-color: var(--color-bg-light);
    color: var(--color-text-primary);
}

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

/* Form Elements */
input[type="text"],
input[type="number"],
input[type="email"],
textarea {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-bg-medium);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition-fast);
}

input:focus,
textarea:focus {
    border-color: var(--color-primary);
}

/* ===================================
   Landing Page Styles
   =================================== */

.landing-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, #2D2D4D 100%);
}

.landing-header {
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.landing-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.hero {
    text-align: center;
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

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

.actions .btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 800px;
    width: 100%;
}

.feature {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.feature:hover {
    transform: translateY(-4px);
    background-color: rgba(255, 255, 255, 0.08);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

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

.feature p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.landing-footer {
    padding: var(--spacing-md) var(--spacing-xl);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ===================================
   App Container (Board View)
   =================================== */

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

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

.sidebar {
    width: 240px;
    background-color: var(--color-bg-dark);
    border-left: 1px solid var(--color-bg-light);
    display: flex;
    flex-direction: column;
    z-index: var(--z-toolbar);
    overflow-y: auto;
}

/* User List */
.user-list {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-bg-light);
    margin-top: auto;
}

.user-list-header {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.user-list-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.user-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

.user-item:hover {
    background-color: var(--color-bg-medium);
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: white;
}

.user-name {
    font-size: 12px;
    color: var(--color-text-primary);
}

.user-count {
    font-size: 11px;
    color: var(--color-text-secondary);
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

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