:root {
    --bg-main: #f8fafc;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.logo-icon {
    font-size: 1.5rem;
}

.sidebar-nav {
    padding: 20px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-item:hover {
    background-color: var(--bg-main);
    color: var(--text-main);
}

.nav-item.active {
    background-color: #eef2ff;
    color: var(--primary);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.server-status {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--success);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
}

.page-header {
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-muted);
}

/* Cards & Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text-main);
    transition: all 0.2s;
    background-color: var(--bg-main);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background-color: #fff;
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

.file-upload-wrapper {
    position: relative;
    width: 100%;
    height: 100px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    color: var(--text-muted);
    transition: all 0.2s;
    cursor: pointer;
    background-color: var(--bg-main);
}

.file-upload-wrapper:hover {
    border-color: var(--primary);
    background-color: #eef2ff;
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    color: white;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.danger-btn {
    background-color: var(--danger);
}
.danger-btn:not(:disabled):hover {
    background-color: var(--danger-hover);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-box {
    background: var(--bg-main);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.text-green { color: var(--success); }
.text-red { color: var(--danger); }
.text-yellow { color: #f59e0b; }

/* Progress Bar */
.progress-container {
    margin-top: 16px;
}

.progress-bar-bg {
    width: 100%;
    height: 12px;
    background-color: var(--bg-main);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary);
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}