/* CSS Variables for Dark Theme */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-elevated: #242424;
    --bg-modal: rgba(0, 0, 0, 0.8);
    
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #0ea5e9;
    --accent-success: #22c55e;
    --accent-warning: #f59e0b;
    --accent-error: #ef4444;
    
    --border-color: #27272a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    
    --radius: 8px;
    --transition: all 0.2s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    background-color: var(--bg-secondary);
    box-shadow: 0 0 50px rgba(14, 165, 233, 0.1);
}

/* Header */
header {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    padding: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(to right, var(--accent-primary), #0284c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Icon Button */
.btn-icon {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    transition: var(--transition);
    color: var(--text-secondary);
}

.btn-icon:hover {
    background-color: rgba(14, 165, 233, 0.1);
    color: var(--accent-primary);
}

/* Main Content */
main {
    padding: 1.5rem;
}

/* Banners */
.banner {
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.banner:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.hidden {
    display: none;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 0.75rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.btn-primary:hover {
    background-color: #0284c7;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Messages List */
.messages-list {
    margin-top: 1.5rem;
}

.messages-list h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Message Items */
.message-item {
    background-color: var(--bg-elevated);
    border-left: 4px solid var(--accent-primary);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.message-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(2px);
}

.message-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.05));
    opacity: 0;
    transition: opacity 0.3s;
}

.message-item:hover::before {
    opacity: 1;
}

.message-item.priority-error {
    border-left-color: var(--accent-error);
}

.message-item.priority-error::before {
    background: linear-gradient(90deg, transparent, rgba(239, 68, 68, 0.05));
}

.message-item.priority-warning {
    border-left-color: var(--accent-warning);
}

.message-item.priority-warning::before {
    background: linear-gradient(90deg, transparent, rgba(245, 158, 11, 0.05));
}

.message-item.priority-info {
    border-left-color: var(--accent-primary);
}

.message-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.message-body {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.message-time {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Modal */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-modal);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg-elevated);
    margin: 10% auto;
    padding: 2rem;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    animation: slideIn 0.3s ease;
}

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

.close {
    color: var(--text-muted);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.close:hover {
    color: var(--text-primary);
}

/* Form Groups */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-group input[readonly] {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.form-group small {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.form-group button {
    margin-top: 0.5rem;
}

/* Connection Status */
#connectionStatus {
    padding: 0.75rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
}

/* Load More Button */
#loadMore {
    width: 100%;
    margin-top: 1rem;
}

/* Empty State */
#messagesContainer p {
    text-align: center;
    color: var(--text-muted);
    padding: 3rem 1rem;
    font-size: 0.95rem;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        min-height: 100vh;
        box-shadow: none;
    }
    
    .modal-content {
        margin: 5% auto;
        width: 95%;
        padding: 1.5rem;
    }
    
    header {
        padding: 1rem;
    }
    
    main {
        padding: 1rem;
    }
}

/* PWA Install Button (if needed) */
@media (display-mode: standalone) {
    /* Styles for when app is installed as PWA */
    header {
        padding-top: 2rem; /* Account for iOS status bar */
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}