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

:root {
    /* Starfish Academy colors - from actual logo */
    --primary-blue: #00527C;
    --primary-blue-dark: #003d5c;
    --primary-blue-light: #006fa3;
    --accent-orange: #F39200;
    --accent-orange-dark: #E67E00;
    --accent-orange-light: #FFA51A;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --text-dark: #2C3E50;
    --text-gray: #6C757D;
    --border-light: #E9ECEF;
    --success-green: #28A745;
    --danger-red: #DC3545;
    --card-shadow: 0 2px 8px rgba(0, 82, 124, 0.1);
    --card-shadow-hover: 0 4px 16px rgba(0, 82, 124, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-light);
    min-height: 100vh;
    padding: 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-white);
    box-shadow: 0 0 30px rgba(43, 95, 204, 0.08);
}

header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
    padding: 40px;
    text-align: center;
    position: relative;
    border-bottom: 4px solid var(--accent-orange);
}

.language-switcher {
    position: absolute;
    top: 20px;
    right: 40px;
    display: flex;
    gap: 8px;
    z-index: 10;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 8px 18px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
    backdrop-filter: blur(10px);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: var(--accent-orange);
    transform: translateY(-2px);
}

.lang-btn.active {
    background: var(--accent-orange);
    color: white;
    border-color: var(--accent-orange);
    box-shadow: 0 4px 12px rgba(243, 146, 0, 0.4);
}

.lang-btn i {
    margin-right: 5px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header p {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 400;
}

.investment-tabs {
    display: flex;
    background: var(--bg-white);
    border-bottom: 2px solid var(--border-light);
    overflow-x: auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tab-btn {
    flex: 1;
    padding: 18px 20px;
    background: transparent;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-gray);
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    min-width: 150px;
}

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

.tab-btn.active {
    color: var(--primary-blue);
    border-bottom-color: var(--accent-orange);
    background: var(--bg-white);
}

.tab-btn i {
    margin-right: 8px;
    color: var(--accent-orange);
}

.tab-content {
    display: none;
    padding: 40px;
    animation: fadeIn 0.4s ease;
    background: var(--bg-light);
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--card-shadow);
}

.form-card h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--accent-orange);
    font-weight: 700;
}

.form-card h2 i {
    color: var(--primary-blue);
    margin-right: 10px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

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

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    padding: 12px 15px;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
    background: var(--bg-white);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(43, 95, 204, 0.1);
}

.calculate-btn {
    background: linear-gradient(135deg, var(--accent-orange) 0%, var(--accent-orange-dark) 100%);
    color: white;
    border: none;
    padding: 16px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(243, 146, 0, 0.3);
    font-family: 'Inter', sans-serif;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(243, 146, 0, 0.4);
    background: linear-gradient(135deg, var(--accent-orange-light) 0%, var(--accent-orange) 100%);
}

.calculate-btn:active {
    transform: translateY(-1px);
}

.calculate-btn i {
    margin-right: 8px;
}

.results-section {
    margin-top: 40px;
    animation: slideIn 0.4s ease;
}

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

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 24px;
    border-radius: 12px;
    border-left: 4px solid var(--primary-blue);
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

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

.result-card.highlight {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
    border-left: 4px solid var(--accent-orange);
    box-shadow: 0 4px 16px rgba(0, 82, 124, 0.3);
}

.result-card.highlight:hover {
    box-shadow: 0 6px 20px rgba(0, 82, 124, 0.4);
}

.result-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.85;
    margin-bottom: 8px;
}

.result-card.highlight .result-label {
    opacity: 0.95;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.result-subtitle {
    font-size: 0.9rem;
    margin-top: 5px;
    opacity: 0.75;
    font-weight: 500;
}

.table-responsive {
    overflow-x: auto;
    margin-top: 30px;
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.data-table thead {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.data-table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    transition: all 0.2s ease;
}

.data-table tbody tr:hover {
    background: var(--bg-light);
}

.data-table tbody tr:nth-child(even) {
    background: #f8f9fa;
}

.data-table tbody tr:nth-child(even):hover {
    background: var(--bg-light);
}

.chart-container {
    margin-top: 40px;
    padding: 30px;
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.comparison-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.comparison-card {
    background: var(--bg-white);
    padding: 28px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid;
    transition: all 0.3s ease;
}

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

.comparison-card.paper {
    border-color: var(--primary-blue);
}

.comparison-card.etf {
    border-color: var(--success-green);
}

.comparison-card.realestate {
    border-color: var(--accent-orange);
}

.comparison-card h3 {
    font-size: 1.3rem;
    margin-bottom: 18px;
    color: var(--text-dark);
    font-weight: 700;
}

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

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

.metric-label {
    font-weight: 600;
    color: var(--text-gray);
    font-size: 0.95rem;
}

.metric-value {
    font-weight: 700;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.info-text {
    text-align: center;
    color: var(--text-gray);
    font-size: 1.1rem;
    padding: 30px;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 20px;
    border: 2px dashed var(--border-light);
}

.info-text i {
    color: var(--primary-blue);
    margin-right: 8px;
}

.positive {
    color: var(--success-green);
}

.negative {
    color: var(--danger-red);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 40px 0 24px 0;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--accent-orange);
    display: flex;
    align-items: center;
}

.section-title i {
    color: var(--primary-blue);
    margin-right: 12px;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 0;
    }
    
    .container {
        box-shadow: none;
    }
    
    .language-switcher {
        position: static;
        justify-content: center;
        margin-bottom: 20px;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }

    header p {
        font-size: 0.95rem;
    }

    .tab-content {
        padding: 20px;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .form-card {
        padding: 20px;
    }

    .result-value {
        font-size: 1.5rem;
    }

    .investment-tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        font-size: 0.9rem;
        padding: 15px;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-summary {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    header p {
        font-size: 0.85rem;
    }

    .calculate-btn {
        width: 100%;
        padding: 14px 30px;
    }
    
    .form-card h2 {
        font-size: 1.5rem;
    }
    
    .lang-btn {
        padding: 6px 14px;
        font-size: 0.85rem;
    }
}

/* Additional Starfish Academy inspired elements */
.form-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-yellow));
    border-radius: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.form-card {
    position: relative;
}

.result-card.positive {
    border-left-color: var(--success-green);
}

.result-card.negative {
    border-left-color: var(--danger-red);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue-dark);
}

/* Selection styling */
::selection {
    background: var(--accent-orange);
    color: white;
}

::-moz-selection {
    background: var(--accent-orange);
    color: white;
}