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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(180deg, #f5f9ff 0%, #e8f1fb 100%);
    color: #1d1d1f;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 380px;
}

h1 {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 600;
    margin-bottom: 36px;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, #0071e3, #5db8f5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card {
    background: #fff;
    border-radius: 24px;
    padding: 32px 28px;
    box-shadow: 0 4px 20px rgba(0, 113, 227, 0.08), 0 1px 3px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.card h2 {
    font-size: 0.85rem;
    font-weight: 600;
    color: #86868b;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 20px;
}

.input-group {
    margin-bottom: 18px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    color: #6e6e73;
    font-size: 0.9rem;
    margin-bottom: 8px;
    font-weight: 500;
}

.input-group select,
.input-group input {
    width: 100%;
    padding: 16px 18px;
    background: #f5f5f7;
    border: none;
    border-radius: 12px;
    color: #1d1d1f;
    font-size: 1.05rem;
    font-weight: 400;
    transition: all 0.3s;
    -webkit-appearance: none;
    appearance: none;
}

.input-group select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236e6e73' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 44px;
}

.input-group select:focus,
.input-group input:focus {
    outline: none;
    background: #e8e8ed;
}

.input-group select option {
    background: #fff;
    color: #1d1d1f;
}

.input-group input::placeholder {
    color: #a1a1a6;
}

.result-grid {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.result-item {
    background: linear-gradient(135deg, #0071e3, #5db8f5);
    border-radius: 16px;
    padding: 22px 18px;
    text-align: center;
}

.result-item:nth-child(2) {
    background: linear-gradient(135deg, #5856d6, #af52de);
}

.result-item:nth-child(3) {
    background: linear-gradient(135deg, #00c7be, #30d158);
}

.result-item:nth-child(4) {
    background: linear-gradient(135deg, #ff9500, #ffd60a);
}

.result-item:nth-child(5) {
    background: linear-gradient(135deg, #ff375f, #ff6b6b);
}

.result-grid {
    grid-template-columns: repeat(3, 1fr);
}

.result-label {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.7rem;
    margin-bottom: 8px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.result-value {
    display: block;
    color: #fff;
    font-size: 1.7rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.result-unit {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.65rem;
    margin-left: 2px;
}

@media (max-width: 480px) {
    body {
        padding: 16px;
        align-items: flex-start;
        padding-top: 50px;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 28px;
    }

    .card {
        padding: 24px 20px;
        border-radius: 20px;
    }

    .input-group input,
    .input-group select {
        padding: 14px 16px;
        font-size: 1rem;
    }

    .result-grid {
        gap: 12px;
    }

    .result-item {
        padding: 18px 14px;
        border-radius: 14px;
    }

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

    .result-label {
        font-size: 0.65rem;
    }
}