@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@500;700;900&display=swap');

:root {
    --primary-color: #00bcd4; /* Cyan */
    --accent-color: #ff9800; /* Orange */
    --secondary-bg: #e0f7fa; /* Light Cyan */
    --bg-color: #f7f9fc;
    --text-color: #212121;
    --border-radius: 16px;
    --shadow-light: rgba(0,0,0,0.08);
    --shadow-heavy: rgba(0,0,0,0.15);
    --transition-fast: 0.25s ease-in-out;
}
/* 
body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
} */

/* ===== Container ===== */
.container {
    background: linear-gradient(145deg, #ffffff, #f0f5f9);
    padding: 50px 35px;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 40px var(--shadow-heavy), 0 0 0 1px var(--shadow-light);
    max-width: 950px;
    width: 100%;
    transition: transform var(--transition-fast);
}

.container:hover {
    transform: translateY(-3px);
}

/* ===== Headings ===== */
h1 {
    text-align: center;
    color: var(--primary-color);
    font-size: 36px;
    font-weight: 900;
    margin-bottom: 8px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.subtitle {
    text-align: center;
    color: #607d8b;
    margin-bottom: 35px;
    font-size: 16px;
    letter-spacing: 0.5px;
}

/* ===== Category Select ===== */
.category-select-group {
    background: linear-gradient(120deg, #e0f7fa, #b2ebf2);
    padding: 25px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid #b2ebf2;
    margin-bottom: 35px;
    transition: box-shadow var(--transition-fast);
}

.category-select-group:hover {
    box-shadow: 0 10px 25px var(--shadow-light);
}

.category-select-group label {
    display: block;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 18px;
    color: var(--text-color);
}

.category-select-group select {
    padding: 14px 18px;
    font-size: 18px;
    border-radius: 12px;
    border: 2px solid var(--primary-color);
    background: #ffffff;
    cursor: pointer;
    font-weight: 600;
    width: 100%;
    max-width: 380px;
    transition: all var(--transition-fast);
}

.category-select-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 12px rgba(255, 152, 0, 0.3);
}

/* ===== Conversion Area ===== */
.conversion-area {
    display: grid;
    grid-template-columns: 2fr 0.5fr 2fr;
    gap: 25px;
    align-items: center;
    margin-bottom: 30px;
}

.side-panel {
    background: #ffffff;
    border-radius: 14px;
    padding: 28px 22px;
    box-shadow: 0 10px 25px var(--shadow-light);
    border: 1px solid #e0e0e0;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.side-panel:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px var(--shadow-heavy);
}

.side-panel h2 {
    font-size: 19px;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 15px;
    border-bottom: 3px solid #ffcc80;
    padding-bottom: 5px;
}

.side-panel input, .side-panel select {
    width: 100%;
    padding: 16px 18px;
    margin-top: 12px;
    border-radius: 10px;
    border: 1px solid #bdbdbd;
    font-size: 20px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.side-panel input:focus, .side-panel select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(0,188,212,0.3);
    outline: none;
}

#outputValue {
    background-color: #f0f4f7;
    font-weight: 700;
    color: var(--text-color);
    cursor: default;
}

/* ===== Middle Swap Control ===== */
.middle-controls {
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-btn {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: none;
    background: var(--accent-color);
    color: white;
    font-size: 28px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 8px 20px rgba(255,152,0,0.4);
}

.swap-btn:hover {
    background: #fb8c00;
    transform: rotate(120deg) scale(1.1);
}

/* ===== Footer Actions ===== */
.footer-actions {
    text-align: center;
    margin-top: 25px;
}

.reset-btn {
    background: #757575;
    color: #fff;
    font-size: 17px;
    font-weight: 700;
    padding: 14px 32px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.reset-btn:hover {
    background: #616161;
    transform: translateY(-2px);
}



/* ===== Responsive ===== */
@media (max-width: 850px) {
    .conversion-area {
        grid-template-columns: 1fr;
    }

    .middle-controls {
        order: 0;
        justify-content: center;
    }
}

@media (max-width: 500px) {
    .container {
        padding: 25px 18px;
    }

    h1 {
        font-size: 28px;
    }

    .category-select-group select {
        font-size: 16px;
    }

    .side-panel input, .side-panel select {
        font-size: 18px;
        padding: 14px;
    }

    .swap-btn {
        width: 55px;
        height: 55px;
        font-size: 22px;
    }
}