:root {
    --bg-color: #f4f7fb;
    --sidebar-bg: #1e293b;
    --sidebar-text: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --border: #e2e8f0;
    --success: #10b981;
    --error: #ef4444;
}

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

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

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

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
}

.logo {
    padding: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav {
    display: flex;
    flex-direction: column;
    padding: 16px 0;
}

nav a {
    color: #cbd5e1;
    text-decoration: none;
    padding: 12px 24px;
    transition: all 0.2s;
}

nav a:hover, nav a.active {
    background-color: rgba(255,255,255,0.05);
    color: #fff;
    border-left: 4px solid var(--primary);
}

.content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 24px;
}

.btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text-main);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn:hover {
    background: #f8fafc;
}

.btn.primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn.primary:hover {
    background: var(--primary-hover);
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    background: #f8fafc;
}

.hidden { display: none; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-4 { margin-top: 16px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; }
.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
}

.file-drop-area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    padding: 40px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    background-color: #f8fafc;
    transition: 0.2s;
}

.file-drop-area.dragover { background-color: #e2e8f0; border-color: var(--primary); }

.fake-btn {
    background-color: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    margin-right: 12px;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    cursor: pointer;
    opacity: 0;
}

.alert {
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 16px;
}

.alert.info { background: #eff6ff; color: #1e3a8a; border: 1px solid #bfdbfe; }
.alert.success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

.search-bar { display: flex; gap: 8px; }