@import url('https://fonts.googleapis.com/css2?family=Vazirmatn:wght@400;600&display=swap');

:root {
    --primary-glow: #00c8ff;
    --primary-gold: #d4af37;
    --bg-dark: #0d1117;
    --bg-input: #161b22;
    --text-light: #ffffff;
    --text-muted: #a2a2a2;
}

body {
    font-family: 'Vazirmatn', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 3rem;
    font-size: 17px;
    /* فونت عمومی بزرگ‌تر */
}

header.brand {
    text-align: center;
    margin-bottom: 1.5rem;
}

header.brand h1 {
    color: var(--primary-gold);
    font-size: 2rem;
    text-shadow: 0 0 10px var(--primary-gold);
}

header.brand h2 {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-top: 0.3rem;
    opacity: 0.8;
}

.calculator-container {
    background: var(--bg-input);
    border-radius: 12px;
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 520px;
    box-shadow: 0 0 20px rgba(0, 200, 255, 0.2);
    animation: glowPulse 3s infinite alternate;
}

@keyframes glowPulse {
    from {
        box-shadow: 0 0 15px rgba(212, 175, 55, 0.2);
    }

    to {
        box-shadow: 0 0 25px rgba(0, 200, 255, 0.4);
    }
}

label {
    display: block;
    margin-top: 1rem;
    font-size: 1rem;
    color: var(--primary-glow);
}

input,
select {
    width: 100%;
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--primary-glow);
    margin-top: 0.5rem;
    background: var(--bg-dark);
    color: var(--text-light);
    font-size: 1rem;
    outline: none;
    box-sizing: border-box;
    appearance: none;
}

select {
    background-image: url("data:image/svg+xml,%3Csvg fill='%23d4af37' height='16' viewBox='0 0 24 24' width='16' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 0.8rem center;
    background-size: 1rem;
    padding-left: 2.2rem;
}


input:focus,
select:focus {
    border-color: var(--primary-gold);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

.two-column {
    display: flex;
    gap: 2rem;
}

.two-column label {
    flex: 1;
}

.two-column .field {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.calc-btn-row {
    margin-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.line {
    flex: 1;
    height: 1px;
    background-color: var(--primary-glow);
    opacity: 0.5;
}

.btnmine {
    width: 40%;
    background: var(--primary-gold);
    color: #000;
    font-weight: 600;
    font-size: 1.4rem;
    border: none;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

button#calcBtn {
    width: 40%;
    background: var(--primary-gold);
    color: #000;
    font-weight: 600;
    font-size: 1.4rem;
    border: none;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

button#calculateBtn {
    width: 40%;
    background: var(--primary-gold);
    color: #000;
    font-weight: 600;
    font-size: 1.4rem;
    border: none;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

button#calculateBtn:hover {
    background: var(--primary-glow);
    color: #fff;
    box-shadow: 0 0 15px var(--primary-glow);
}

.result-box {
    margin-top: 2rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 1rem;
    border: 1px solid var(--primary-glow);
}

.hidden {
    display: none;
}

.tip-text {
    margin-top: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    padding: 0.8rem 1rem;
    text-align: right;
}