:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --primary-color: #4f46e5;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.hero-section {
    text-align: center;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.hero-section h1 span {
    color: var(--primary-color);
}

.tracker-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-group select {
    padding: 8px 12px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    font-size: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

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

th {
    background-color: #f1f5f9;
    font-weight: 600;
    color: #475569;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-block;
}

.status-expired {
    background-color: #fee2e2;
    color: #991b1b;
}

.status-critical {
    background-color: #ffedd5;
    color: #9a3412;
}

.status-warning {
    background-color: #fef9c3;
    color: #854d0e;
}

.status-safe {
    background-color: #dcfce7;
    color: #166534;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    margin-right: 8px;
    transition: transform 0.2s;
}

.btn-icon:hover {
    transform: scale(1.1);
}

.btn-edit { color: #2563eb; }
.btn-delete { color: #dc2626; }
.btn-sale { color: #f59e0b; }

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    padding: 32px;
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-md);
}

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

.close-modal {
    font-size: 24px;
    cursor: pointer;
    color: #64748b;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-sizing: border-box;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
}