:root {
    --bg-gradient: linear-gradient(135deg, #1b1b32, #0a0a23);
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.15);
    --accent: #fecc4c;
    --accent-dark: #feac32;
    --success: #4ade80;
    --danger: #ff6b6b;
    --text-light: #f5f6f7;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Lato', Helvetica, Arial, sans-serif;
    font-size: 18px;
    margin: 0;
    background: var(--bg-gradient);
    color: var(--text-light);
    min-height: 100vh;
}

h1 {
    text-align: center;
    font-size: 2rem;
    margin-top: 30px;
    letter-spacing: 1px;
}

.container {
    width: 95%;
    max-width: 720px;
    margin: 30px auto;
    padding: 25px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
}

legend {
    padding: 0 10px;
    font-weight: bold;
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: bold;
}

input,
select {
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.08);
    color: #bcbcdc;
    transition: 0.2s ease;
}

input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

input:focus,
select:focus,
select:hover {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-dark);
    background-color: #fff;
    color: #0a0a23;
}

select option {
    color: #0a0a23;
    background-color: #fff;
}

button {
    padding: 8px 14px;
    border-radius: 8px;
    border: none;
    background: linear-gradient(45deg, var(--accent), var(--accent-dark));
    font-weight: bold;
    cursor: pointer;
    transition: 0.25s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(254, 172, 50, 0.4);
}

#calorie-counter > div:last-of-type {
    display: flex;
    gap: 12px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.controls span {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.output {
    margin-top: 20px;
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
}

.output span {
    font-weight: bold;
    font-size: 1.3rem;
    display: inline-block;
    padding: 8px 14px;
    border-radius: 20px;
}

.surplus {
    background-color: var(--danger);
    color: white;
}

.deficit {
    background-color: var(--success);
    color: #0a0a23;
}

.hide {
    display: none;
}

input[type='number']::-webkit-outer-spin-button,
input[type='number']::-webkit-inner-spin-button {
    margin: 0;
}

input[type='number'] {
    appearance: textfield;
}

input[type='number']:hover {
    border-color: var(--accent);
    box-shadow: 0 0 6px rgba(254, 204, 76, 0.6);
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 1.6rem;
    }

    button {
        width: 100%;
    }

    .controls span {
        flex-direction: column;
        align-items: stretch;
    }

    #calorie-counter > div:last-of-type {
        flex-direction: column;
    }
}