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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #ffffff;
    color: #1a1a1a;
    padding: 20px;
}

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

h1 {
    font-size: 32px;
    margin-bottom: 40px;
    font-weight: 600;
    border-bottom: 2px solid #000;
    padding-bottom: 15px;
}

.input-section {
    margin-bottom: 40px;
}

.input-section h2 {
    font-size: 16px;
    margin-bottom: 15px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 15px;
    align-items: flex-end;
}

.form-field {
    display: flex;
    flex-direction: column;
}

label {
    font-size: 12px;
    margin-bottom: 6px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input {
    padding: 10px 12px;
    border: 1px solid #000;
    background: #fff;
    font-size: 14px;
    font-family: inherit;
}

input:focus {
    outline: none;
    border-color: #000;
    box-shadow: inset 0 0 0 1px #000;
}

button {
    padding: 10px 20px;
    background: #000;
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button:hover {
    background: #333;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    border: 1px solid #000;
    padding: 20px;
    background: #fff;
}

.stat-card h3 {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 24px;
    font-weight: 700;
}

.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.chart-container {
    position: relative;
    height: 500px;
    border: 1px solid #000;
    padding: 20px 20px 60px 20px;
    overflow: hidden;
}

.chart-container h3 {
    margin-bottom: 15px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table-section {
    margin-top: 40px;
}

.table-section h2 {
    margin-bottom: 20px;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid #000;
    padding-bottom: 10px;
}

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

thead {
    border-bottom: 2px solid #000;
}

th {
    text-align: left;
    padding: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 12px;
    border-bottom: 1px solid #ddd;
    font-size: 14px;
}

tbody tr:hover {
    background: #f5f5f5;
}

.delete-btn {
    padding: 5px 10px;
    background: #fff;
    color: #000;
    border: 1px solid #000;
    font-size: 12px;
    cursor: pointer;
    font-weight: 600;
}

.delete-btn:hover {
    background: #000;
    color: #fff;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: #666;
}

.load-more-container {
    text-align: center;
    padding: 20px 0;
    margin-top: 10px;
}

.load-more-btn {
    padding: 12px 30px;
    background: #fff;
    color: #000;
    border: 1px solid #000;
    font-size: 13px;
    cursor: pointer;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.load-more-btn:hover {
    background: #000;
    color: #fff;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f5f5f5;
}

.login-card {
    background: #fff;
    border: 1px solid #000;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-card h1 {
    font-size: 24px;
    margin-bottom: 10px;
    border: none;
    padding: 0;
}

.login-card p {
    font-size: 14px;
    color: #666;
    margin-bottom: 30px;
}

.login-input-group {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.login-field {
    display: flex;
    flex-direction: column;
}

.login-field label {
    margin-bottom: 8px;
}

.login-field input {
    width: 100%;
}

.login-button {
    width: 100%;
    padding: 12px;
    background: #000;
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 10px;
}

.login-button:hover {
    background: #333;
}

.login-error {
    color: #d32f2f;
    font-size: 13px;
    margin-top: 10px;
}

.demo-credentials {
    color: green;
    font-size: 0.8em;
    text-transform: none;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 15px;
    border-bottom: 2px solid #000;
}

.header h1 {
    margin-bottom: 0;
    border: none;
    padding: 0;
}

.logout-button {
    padding: 8px 16px;
    background: #000;
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.logout-button:hover {
    background: #333;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .input-group {
        grid-template-columns: 1fr;
    }

    .charts-section {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 450px;
        padding: 15px 15px 80px 15px;
    }

    .stat-card .value {
        font-size: 20px;
    }

    h1 {
        font-size: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .login-card {
        margin: 20px;
    }

    .header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .logout-button {
        width: 100%;
    }
}