/**
 * Modern Streaming Platform CSS
 * Inspired by Twitch, Kick, and YouTube
 */

/* CSS Variables */
:root {
    /* Colors - Modern Dark Theme */
    --bg-primary: #0e0e10;
    --bg-secondary: #18181b;
    --bg-tertiary: #1f1f23;
    --bg-hover: #26262c;
    --bg-active: #2d2d33;
    
    /* Brand Colors */
    --primary-purple: #9147ff;
    --primary-purple-hover: #772ce8;
    --primary-purple-dark: #5c16c5;
    --primary-blue: #4b9bff;
    --accent-red: #eb0400;
    --accent-green: #00f593;
    
    /* Text Colors */
    --text-primary: #efeff1;
    --text-secondary: #adadb8;
    --text-tertiary: #848494;
    --text-link: #bf94ff;
    --text-link-hover: #a970ff;
    
    /* Border Colors */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    --border-focus: #9147ff;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.5);
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 9999px;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

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

* {
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--text-link-hover);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: var(--z-sticky);
}

.header-content {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 var(--space-lg);
    gap: var(--space-lg);
}

/* Logo */
.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background 0.2s ease;
}

.menu-toggle:hover {
    background: var(--bg-hover);
}

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

.logo-icon {
    width: 28px;
    height: 28px;
}

/* Navigation */
.nav-links {
    display: flex;
    gap: var(--space-xs);
}

.nav-link {
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

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

.nav-link.active {
    color: var(--primary-purple);
    background: rgba(145, 71, 255, 0.1);
}

/* Search */
.search-container {
    flex: 1;
    max-width: 400px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-xl) var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--border-focus);
    background: var(--bg-primary);
}

.search-icon {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    pointer-events: none;
}

/* User Section */
.user-section {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

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

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

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

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
}

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

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

.btn-icon {
    width: 18px;
    height: 18px;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 50px;
    width: 240px;
    height: calc(100vh - 50px);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: var(--z-fixed);
    transition: transform 0.3s ease;
}

.sidebar.collapsed {
    width: 50px;
}

.sidebar-section {
    padding: var(--space-md) 0;
}

.sidebar-section-title {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-tertiary);
    letter-spacing: 0.05em;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

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

.sidebar-link.active {
    color: var(--primary-purple);
    background: rgba(145, 71, 255, 0.1);
    border-left: 3px solid var(--primary-purple);
}

.sidebar-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    margin-left: 240px;
    margin-top: 50px;
    flex: 1;
    min-height: calc(100vh - 50px);
    background: var(--bg-primary);
}

.sidebar.collapsed + .main-content {
    margin-left: 50px;
}

/* Page Container */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

/* Stream Cards */
.stream-card {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.2s ease;
    cursor: pointer;
}

.stream-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Live Badge */
.live-badge {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    background: var(--accent-red);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: live-pulse 2s ease-in-out infinite;
}

/* Form Elements */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    background: var(--bg-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 var(--space-md);
        gap: var(--space-md);
    }
    
    .nav-links {
        display: none;
    }
    
    .search-container {
        display: none;
    }
    
    .main-content {
        margin-top: 50px;
    }
}

/* Utilities */
.hidden { display: none !important; }
.invisible { visibility: hidden; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }

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

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-active);
}

/* Loading States */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 0%, var(--bg-tertiary) 50%, var(--bg-secondary) 100%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}