/* /client/calculator/styles.css */

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

:root {
    --primary-color: #000000;
    --secondary-color: #1a1a1a;
    --accent-color: #0066cc;
    --text-primary: #000000;
    --text-secondary: #666666;
    --background: #ffffff;
    --card-background: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Login Screen Styles */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    max-width: 450px;
    width: 100%;
    overflow: hidden;
}

.login-header {
    background: var(--primary-color);
    color: white;
    padding: 30px;
    text-align: center;
}

.login-header h1 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px;
    margin: 0;
}

.login-content {
    padding: 40px 30px;
}

.login-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    text-align: center;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 30px;
}

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

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

.login-input-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-input-group input {
    padding: 14px 16px;
    font-size: 16px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.login-input-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.error-message {
    font-size: 13px;
    color: #dc3545;
    margin-top: 6px;
    min-height: 18px;
    display: block;
}

.login-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.login-button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.login-button:active {
    transform: translateY(0);
}

.login-footer {
    background: var(--card-background);
    padding: 20px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Calculator Screen Styles */
header {
    padding: 30px 0;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: 40px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary-color);
}

.echo-button {
    border: none;
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    font-weight: 500;
}

.echo-button:hover {
    transform: translateY(-1px);
    color: var(--text-secondary)
}

.logout-button {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.logout-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

main {
    flex: 1;
}

.calculator-card {
    background: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.calculator-header {
    background: var(--primary-color);
    color: white;
    padding: 30px;
    text-align: center;
}

.calculator-header h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 16px;
    opacity: 0.9;
    font-weight: 300;
}

.input-section {
    padding: 40px 30px;
    background: white;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    padding: 12px 16px;
    font-size: 18px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.helper-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
    font-style: italic;
}

.results-section {
    padding: 40px 30px;
    background: white;
    border-top: 1px solid var(--border-color);
}

.results-section h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 25px;
    text-align: center;
    color: var(--text-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-card {
    background: var(--primary-color);
    color: white;
    padding: 25px;
    border-radius: 6px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.result-label {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    opacity: 0.9;
    font-weight: 500;
}

.result-value {
    font-size: 36px;
    font-weight: 700;
    line-height: 1;
}

.additional-metrics {
    background: var(--card-background);
    padding: 25px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.metric-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
}

@media (max-width: 768px) {
    .logo h1 {
        font-size: 18px;
    }

    .calculator-header h2 {
        font-size: 22px;
    }

    .input-section {
        grid-template-columns: 1fr;
        padding: 30px 20px;
    }

    .results-section {
        padding: 30px 20px;
    }

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

    .result-value {
        font-size: 28px;
    }

    .metric-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    .header-buttons {
        flex-direction: column;
        gap: 8px;
    }

    .echo-button,
    .logout-button {
        padding: 6px 12px;
        font-size: 12px;
    }
}

@media print {
    .input-group input {
        border: 1px solid var(--border-color);
    }
    
    .result-card {
        break-inside: avoid;
    }
}