:root {
    --color-white: rgba(255, 255, 255, 1);
    --color-cream-50: rgba(252, 252, 249, 1);
    --color-cream-100: rgba(255, 255, 253, 1);
    --color-gray-200: rgba(245, 245, 245, 1);
    --color-gray-300: rgba(167, 169, 169, 1);
    --color-slate-500: rgba(98, 108, 113, 1);
    --color-brown-600: rgba(94, 82, 64, 1);
    --color-charcoal-700: rgba(31, 33, 33, 1);
    --color-charcoal-800: rgba(38, 40, 40, 1);
    --color-slate-900: rgba(19, 52, 59, 1);
    --color-teal-300: rgba(50, 184, 198, 1);
    --color-teal-500: rgba(33, 128, 141, 1);
    --color-teal-600: rgba(29, 116, 128, 1);
    --color-orange-400: rgba(230, 129, 97, 1);
    --color-orange-500: rgba(168, 75, 47, 1);
    
    --color-brown-600-rgb: 94, 82, 64;
    --color-teal-500-rgb: 33, 128, 141;
    --color-orange-500-rgb: 168, 75, 47;
    
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-slate-900);
    --color-text-secondary: var(--color-slate-500);
    --color-primary: var(--color-teal-500);
    --color-primary-hover: var(--color-teal-600);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
    --color-warning: var(--color-orange-500);
    
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --radius-base: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-gray-400-rgb: 119, 124, 124;
        --color-teal-300-rgb: 50, 184, 198;
        --color-gray-300-rgb: 167, 169, 169;
        --color-orange-400-rgb: 230, 129, 97;
        
        --color-background: var(--color-charcoal-700);
        --color-surface: var(--color-charcoal-800);
        --color-text: var(--color-gray-200);
        --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
        --color-primary: var(--color-teal-300);
        --color-border: rgba(var(--color-gray-400-rgb), 0.3);
        --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
        --color-warning: var(--color-orange-400);
    }
}

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

body {
    font-family: var(--font-family-base);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    padding: 20px;
    overflow-x: hidden;
    zoom: 0.8;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 30px;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-teal-300));
}

.logo {
    max-width: 200px;
    height: auto;
    margin-bottom: 20px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.header h1 {
    font-size: 32px;
    color: var(--color-text);
    margin-bottom: 12px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header p {
    color: var(--color-text-secondary);
    font-size: 16px;
    margin-bottom: 24px;
}

.header-buttons {
    margin-top: 15px;
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 28px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-base);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px rgba(var(--color-teal-500-rgb), 0.3);
}

.btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--color-teal-500-rgb), 0.4);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    box-shadow: none;
}

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

.calculator-section {
    background: var(--color-surface);
    padding: 40px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
    position: relative;
}

.calculator-title {
    font-size: 24px;
    color: var(--color-text);
    margin-bottom: 28px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 28px;
}

.form-group {
    display: flex;
    flex-direction: column;
    position: relative;
}

label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 10px;
}

input, select {
    padding: 14px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-base);
    background: var(--color-background);
    color: var(--color-text);
    font-size: 15px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
}

input:hover, select:hover {
    border-color: var(--color-primary);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-teal-500-rgb), 0.1);
    transform: translateY(-1px);
}

.calculate-btn-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.btn-calculate {
    padding: 16px 48px;
    font-size: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-teal-600));
    position: relative;
    overflow: hidden;
}

.btn-calculate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-calculate:hover::before {
    left: 100%;
}

.result-box {
    margin-top: 28px;
    padding: 28px;
    background: linear-gradient(135deg, rgba(var(--color-teal-500-rgb), 0.08), rgba(var(--color-teal-500-rgb), 0.12));
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    display: none;
    position: relative;
    overflow: hidden;
}

.result-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(var(--color-teal-500-rgb), 0.1) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.result-box.show {
    display: block;
}

.result-content {
    position: relative;
    z-index: 1;
}

.result-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-text);
    margin: 12px 0;
    letter-spacing: -1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.result-details {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-top: 16px;
    line-height: 1.8;
    background: var(--color-surface);
    padding: 16px;
    border-radius: var(--radius-base);
    border-left: 3px solid var(--color-primary);
}

.result-details strong {
    color: var(--color-text);
    font-weight: 600;
}

.warning-box {
    margin-top: 28px;
    padding: 20px;
    background: rgba(var(--color-orange-500-rgb), 0.08);
    border-left: 4px solid var(--color-warning);
    border-radius: var(--radius-base);
    font-size: 14px;
    color: var(--color-text-secondary);
}

.table-section {
    margin-top: 30px;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--color-primary);
}

.table-container {
    overflow-x: auto;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-lg);
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

th {
    background: linear-gradient(135deg, var(--color-primary), var(--color-teal-600));
    color: var(--color-white);
    padding: 14px 10px;
    text-align: center;
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 10;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

td {
    padding: 12px 10px;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 500;
    transition: all 0.2s;
}

tr:hover td {
    background: rgba(var(--color-teal-500-rgb), 0.05);
}

.first-col {
    font-weight: 700;
    background: rgba(var(--color-teal-500-rgb), 0.12);
    position: sticky;
    left: 0;
    z-index: 5;
    color: var(--color-primary);
}

.highlight-cell {
    background: rgba(var(--color-orange-500-rgb), 0.25) !important;
    font-weight: 800;
    color: var(--color-text) !important;
    box-shadow: inset 0 0 0 2px var(--color-warning);
    position: relative;
}

.instructions {
    background: var(--color-surface);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-card-border);
    margin-top: 30px;
    box-shadow: var(--shadow-md);
}

.instructions h3 {
    font-size: 20px;
    color: var(--color-text);
    margin-bottom: 20px;
    font-weight: 700;
}

.instructions ol {
    margin-left: 20px;
    color: var(--color-text-secondary);
}

.instructions li {
    margin-bottom: 14px;
    font-size: 15px;
    line-height: 1.7;
    padding-left: 8px;
}

.instructions li strong {
    color: var(--color-primary);
    font-weight: 700;
}

.footer {
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
    border-top: 2px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 14px;
}

.footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 700;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.footer a:hover {
    color: var(--color-primary-hover);
    border-bottom-color: var(--color-primary-hover);
}

/* Animação de entrada */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Tooltip e Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--color-primary);
    color: white;
    padding: 20px 24px;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    font-weight: 600;
    max-width: 400px;
    cursor: pointer;
    transition: transform 0.2s;
}

.notification:hover {
    transform: translateY(-2px);
}

.notification.error {
    background: var(--color-warning);
}

.notification-title {
    font-size: 16px;
    margin-bottom: 8px;
    font-weight: 700;
}

.notification-details {
    font-size: 13px;
    opacity: 0.95;
    line-height: 1.6;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.notification-hint {
    font-size: 11px;
    opacity: 0.8;
    margin-top: 8px;
    font-style: italic;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

@media (max-width: 768px) {
    .logo {
        max-width: 150px;
    }

    .header {
        padding: 30px 20px;
    }

    .header h1 {
        font-size: 24px;
    }
    
    .calculator-section {
        padding: 24px 20px;
    }

    .calculator-title {
        font-size: 20px;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }

    .btn-calculate {
        width: 100%;
        padding: 16px 32px;
    }

    .result-value {
        font-size: 36px;
    }
    
    table {
        font-size: 11px;
    }
    
    th, td {
        padding: 10px 6px;
    }

    .notification {
        max-width: calc(100% - 40px);
        left: 20px;
        right: 20px;
    }
}