/* ==============================================
   BASE STYLES - Базовые стили приложения
   ============================================== */

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: var(--font-family-sans);
    background: var(--background-primary);
    color: var(--text-primary);
    /* Allow page scroll globally; main content areas manage their own overflow */
    overflow-x: hidden;
    overflow-y: auto;
}

body {
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Application Layout */
.app-container {
    display: flex !important;
    height: 100vh !important;
    width: 100% !important;
    background: var(--background-primary) !important;
    overflow: hidden !important;
}

.sidebar {
    width: 280px !important;
    flex-shrink: 0 !important;
    background: linear-gradient(180deg, var(--background-secondary) 0%, var(--background-tertiary) 100%) !important;
    border-right: 1px solid var(--border-primary) !important;
    display: flex !important;
    flex-direction: column !important;
    position: relative !important;
    z-index: 100 !important;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3) !important;
}

.main-content {
    flex: 1 !important;
    display: flex !important;
    flex-direction: column !important;
    overflow: hidden !important;
    background: var(--background-primary) !important;
    min-width: 0 !important;
}

/* Modern Content Area Base */
.modern-content-area {
    display: none !important;
    flex-direction: column !important;
    flex: 1 !important;
    height: 100% !important;
    width: 100% !important;
    position: relative !important;
    /* Remove global card-like background/podlozhka */
    background: transparent !important;
    border-radius: 0 !important;
    overflow: hidden !important;
    box-shadow: none !important;
    border: none !important;
    margin: 0 !important;
}

.modern-content-area.active {
    display: flex !important;
}

.modern-content-header {
    padding: var(--space-6) !important;
    background: var(--header-bg) !important;
    backdrop-filter: blur(20px) !important;
    border-bottom: 1px solid var(--divider) !important;
    position: relative !important;
    overflow: hidden !important;
    flex-shrink: 0 !important;
}

.modern-content-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.1), rgba(88, 86, 214, 0.1));
    z-index: 0;
}

.modern-content-header > * {
    position: relative;
    z-index: 1;
}

.modern-page-title {
    font-size: 28px !important;
    font-weight: var(--font-weight-bold) !important;
    color: var(--text-primary) !important;
    margin: 0 0 var(--space-3) 0 !important;
    background: linear-gradient(135deg, #007AFF, #5856D6) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    line-height: var(--line-height-tight) !important;
}

.modern-page-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-muted);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

.modern-content-body {
    flex: 1 !important;
    padding: var(--space-6) !important;
    overflow-y: auto !important;
    position: relative !important;
    height: 100% !important;
}

.modern-content-body::-webkit-scrollbar {
    width: 8px;
}

.modern-content-body::-webkit-scrollbar-track {
    background: transparent;
}

.modern-content-body::-webkit-scrollbar-thumb {
    background: var(--background-quaternary);
    border-radius: var(--radius-sm);
}

.modern-content-body::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Modern Animations */
.modern-fade-in {
    animation: modernFadeIn 0.5s ease-out;
}

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

.modern-slide-up {
    animation: modernSlideUp 0.3s ease-out;
}

@keyframes modernSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modern-pulse {
    animation: modernPulse 2s infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .modern-content-header,
    .modern-content-body {
        padding: var(--space-4);
    }
    
    .modern-page-title {
        font-size: 24px;
    }
}