:root {
    --primary: #dc3545;
    --primary-dark: #bb2d3b;
    --secondary: #6c757d;
    --success: #198754;
    --info: #0dcaf0;
    --warning: #ffc107;
    --danger: #dc3545;
    --light: #f8f9fa;
    --dark: #212529;
    --gradient-primary: linear-gradient(135deg, #dc3545 0%, #ff6b6b 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-sm: 0 2px 4px 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);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--light);
    color: var(--dark);
    transition: all 0.3s ease;
    overflow-x: hidden;
}

[data-bs-theme="dark"] {
    --light: #1a1a2e;
    --dark: #f8f9fa;
    --glass-bg: rgba(0, 0, 0, 0.3);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Glassmorphism */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Gradient Cards */
.gradient-primary {
    background: var(--gradient-primary);
}

.gradient-dark {
    background: var(--gradient-dark);
}

/* Animated Background */
.animated-bg {
    position: relative;
    overflow: hidden;
}

.animated-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(220, 53, 69, 0.1) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Blood Drop Animation */
.blood-drop {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50% 0 50% 50%;
    transform: rotate(45deg);
    animation: fall 3s ease-in infinite;
    opacity: 0.3;
}

.blood-drop:nth-child(1) { left: 10%; animation-delay: 0s; }
.blood-drop:nth-child(2) { left: 30%; animation-delay: 0.5s; }
.blood-drop:nth-child(3) { left: 50%; animation-delay: 1s; }
.blood-drop:nth-child(4) { left: 70%; animation-delay: 1.5s; }
.blood-drop:nth-child(5) { left: 90%; animation-delay: 2s; }

@keyframes fall {
    0% {
        top: -10%;
        opacity: 0;
    }
    50% {
        opacity: 0.3;
    }
    100% {
        top: 100%;
        opacity: 0;
    }
}

/* Card Hover Effects */
.hover-card {
    transition: all 0.3s ease;
}

.hover-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Stats Cards */
.stat-card {
    padding: 1.5rem;
    border-radius: var(--radius-md);
    color: white;
    position: relative;
    overflow: hidden;
}

.stat-card .icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    opacity: 0.2;
}

.stat-card .counter {
    font-size: 2.5rem;
    font-weight: bold;
}

/* Buttons */
.btn-gradient {
    background: var(--gradient-primary);
    border: none;
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(220, 53, 69, 0.4);
    color: white;
}

.btn-gradient::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.btn-gradient:hover::after {
    left: 100%;
}

/* Dashboard Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 280px;
    background: var(--gradient-dark);
    color: white;
    transition: all 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7);
    padding: 12px 20px;
    border-radius: 8px;
    margin: 4px 12px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.sidebar .nav-link i {
    margin-right: 12px;
    width: 20px;
}

.main-content {
    margin-left: 280px;
    transition: all 0.3s ease;
    min-height: 100vh;
}

.main-content.expanded {
    margin-left: 80px;
}

/* Mobile Bottom Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 10px;
}

/* Chat UI */
.chat-container {
    display: flex;
    height: calc(100vh - 200px);
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.chat-list {
    width: 350px;
    border-right: 1px solid #e0e0e0;
    overflow-y: auto;
}

.chat-messages {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #f7f7f7;
}

.message {
    margin-bottom: 15px;
    display: flex;
}

.message.sent {
    justify-content: flex-end;
}

.message.received {
    justify-content: flex-start;
}

.message-content {
    max-width: 70%;
    padding: 10px 15px;
    border-radius: 18px;
    position: relative;
}

.message.sent .message-content {
    background: var(--gradient-primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.received .message-content {
    background: white;
    color: var(--dark);
    border-bottom-left-radius: 4px;
}

/* Notification Dropdown */
.notification-dropdown {
    width: 350px;
    max-height: 400px;
    overflow-y: auto;
}

.notification-item {
    padding: 12px 15px;
    border-bottom: 1px solid #e0e0e0;
    transition: background 0.3s ease;
    cursor: pointer;
}

.notification-item:hover {
    background: #f8f9fa;
}

.notification-item.unread {
    background: #fff3f3;
}

/* Skeleton Loader */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-nav {
        display: flex;
        justify-content: space-around;
    }
    
    .main-content {
        padding-bottom: 70px;
    }
    
    .chat-container {
        flex-direction: column;
        height: calc(100vh - 150px);
    }
    
    .chat-list {
        width: 100%;
        height: 40%;
    }
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: none;
    z-index: 999;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.scroll-to-top.show {
    display: block;
    animation: fadeInUp 0.3s ease;
}

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