:root {
    --primary: #0056b3;
    --primary-light: #007bff;
    --white: #ffffff;
    --bg: #f4f6f9;
    --text: #333;
    --gray: #ccc;
    --danger: #dc3545;
    --success: #28a745;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--white);
    color: var(--text);
    margin: 0;
    padding: 0;
}

/* Header & Logo */
header {
    background-color: var(--white);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid var(--primary);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--primary);
    padding: 10px 20px;
    border-radius: 5px;
    background: var(--white);
}

.logo span {
    color: var(--primary-light);
}

.disclaimer-asterisk {
    color: var(--primary);
    font-size: 24px;
    cursor: pointer;
    vertical-align: super;
    text-decoration: none;
}

/* Navigation */
nav {
    display: flex;
    gap: 20px;
}

nav button {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text);
    padding: 5px 10px;
    border-bottom: 2px solid transparent;
}

nav button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Main Content */
main {
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

h2 {
    color: var(--primary);
    border-bottom: 1px solid var(--gray);
    padding-bottom: 10px;
}

/* Grids */
.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: var(--white);
    border: 1px solid #e1e4e8;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: transform 0.2s;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-light);
}

.card h3 {
    margin-top: 0;
    color: var(--primary);
}

.card .price {
    font-weight: bold;
    font-size: 1.2em;
    color: var(--text);
    margin: 10px 0;
}

.card .actions {
    margin-top: auto;
}

.btn {
    background-color: var(--primary);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    width: 100%;
    transition: background 0.2s;
}

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

.btn-secondary {
    background-color: #6c757d;
}

.btn-danger {
    background-color: var(--danger);
}

.btn-success {
    background-color: var(--success);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.hidden {
    display: none !important;
}

.modal {
    background: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    text-align: center;
    max-width: 400px;
    width: 100%;
}

.modal input {
    width: 100%;
    padding: 10px;
    margin: 20px 0;
    border: 1px solid var(--gray);
    border-radius: 4px;
}

/* Admin Specific */
.admin-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
}

.admin-row:last-child {
    border-bottom: none;
}

.trade-row {
    background: #fff;
    border: 1px solid #ccc;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
}