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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #ffffff;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: linear-gradient(90deg, #000000 0%, #1a1a1a 100%);
    padding: 3rem 0;
    text-align: center;
    margin-bottom: 3rem;
    border-bottom: 4px solid #ff6600;
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #ff6600 50%, transparent 100%);
}

.header h1 {
    font-size: 3rem;
    font-weight: 800;
    color: #ff6600;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    letter-spacing: 2px;
}

.header p {
    font-size: 1.2rem;
    color: #cccccc;
    font-weight: 300;
    letter-spacing: 1px;
}

.container {
    background: #2a2a2a;
    max-width: 800px;
    margin: 0 auto 3rem auto;
    padding: 3rem;
    flex: 1;
}

.subject-group {
    margin-bottom: 2rem;
    position: relative;
}

.subject-group label {
    display: block;
    font-weight: 700;
    color: #ff6600;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.subject-group input {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid #444444;
    border-radius: 8px;
    font-size: 1.1rem;
    background: #333333;
    color: #ffffff;
    font-weight: 500;
}

.subject-group input:focus {
    outline: none;
    border-color: #ff6600;
    background: #3a3a3a;
}

.subject-group input::placeholder {
    color: #888888;
    font-style: italic;
}

.button-container {
    display: flex;
    gap: 2rem;
    margin-top: 3rem;
    justify-content: center;
}

.calculate-btn, .reset-btn {
    flex: 1;
    max-width: 200px;
    padding: 1.2rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.calculate-btn {
    background: #ff6600;
    color: #000000;
}

.calculate-btn:hover {
    background: #ff8533;
}

.reset-btn {
    background: #444444;
    color: #ffffff;
}

.reset-btn:hover {
    background: #555555;
}

.result-container {
    background: #2a2a2a;
    max-width: 800px;
    padding: 4rem;
    text-align: center;
}

.result-card {
    background: #2a2a2a;
    padding: 3rem;
    text-align: center;
}

.result-card h2 {
    color: #ff6600;
    font-size: 2rem;
    margin-bottom: 2rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.result-details {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: #333333;
    border-left: 5px solid #ff6600;
}

.result-item .label {
    font-weight: 700;
    color: #ffffff;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-item .value {
    font-weight: 700;
    color: #ffffff;
    font-size: 1.2rem;
}

.result-item .grade {
    font-size: 1.5rem;
    font-weight: 800;
    color: #ff6600;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.new-calculation-btn {
    background: #ff6600;
    color: #000000;
    border: none;
    padding: 1.2rem 3rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.new-calculation-btn:hover {
    background: #ff8533;
}

.footer {
    background: linear-gradient(90deg, #000000 0%, #1a1a1a 100%);
    color: #cccccc;
    padding: 2rem 0;
    margin-top: auto;
    border-top: 4px solid #ff6600;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #ff6600 50%, transparent 100%);
}

.footer-content {
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content p {
    font-size: 1rem;
    opacity: 0.8;
    letter-spacing: 1px;
}

.result-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

.result-title {
    color: #ff6600;
    font-size: 3rem;
    margin-bottom: 3rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.result-details {
    display: grid;
    gap: 2rem;
    margin-bottom: 3rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 3rem;
    background: #333333;
    border-left: 5px solid #ff6600;
}

.result-item .label {
    font-weight: 700;
    color: #ffffff;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-item .value {
    font-weight: 700;
    color: #ffffff;
    font-size: 1.3rem;
}

.result-item .grade {
    font-size: 1.8rem;
    font-weight: 800;
    color: #ff6600;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.back-btn {
    background: #ff6600;
    color: #000000;
    border: none;
    padding: 1.2rem 3rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.back-btn:hover {
    background: #ff8533;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2.5rem;
    }
    
    .container {
        margin: 0 1rem 3rem 1rem;
        padding: 2rem;
    }
    
    .button-container {
        flex-direction: column;
        align-items: center;
    }
    
    .calculate-btn, .reset-btn {
        max-width: 100%;
        width: 100%;
    }
    
    .result-container {
        margin: 0 1rem;
        padding: 2rem;
    }
    
    .result-title {
        font-size: 2.5rem;
    }
    
    .result-item {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 2rem 0;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 1.5rem;
    }
    
    .result-container {
        padding: 1.5rem;
    }
    
    .button-container {
        gap: 1rem;
    }
}