:root {
    --bg: #08080a;
    --card-bg: #111114;
    --input-bg: #1a1a1e;
    --accent: #9d4edd;
    --accent-glow: rgba(157, 78, 221, 0.4);
    --text-main: #ffffff;
    --text-dim: #88888e;
    --border: #2d2d35;
    --success: #00f5d4;
}

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

body{
    background-color: var(--bg);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: 2rem;
    padding: 20px;
}

.calculator-card{
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 24px;
    width: 100%;
    max-width: 420px;
    border: 1px solid var(--border);
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.7);
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.calculator-card:hover{
    transform: translateY(-5px);
    border-color: #444;
}

.header{
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

h1{
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

h1 span{
    color: var(--accent);
    text-shadow: 0 0 15px var(--accent-glow);
}

.subtitle{
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    display: block;
}

.input-wrapper{
    position: relative;
    margin-bottom: 1rem;
}

input{
    width: 100%;
    background: var(--input-bg);
    border: 2px solid var(--border);
    padding: 16px;
    border-radius: 12px;
    color: #fff;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    position: relative;
    z-index: 2;
}

input:focus{
    border-color: var(--accent);
    background: #1d1d22;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.input-glow {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    border-radius: 12px;
    z-index: 1;
    transition: box-shadow 0.3s ease;
}

input:focus + .input-glow {
    box-shadow: 0 0 25px var(--accent-glow);
}

.mode-toggle {
    display: flex;
    background: #000;
    padding: 4px;
    border-radius: 10px;
    gap: 4px;
}

.mode-toggle button {
    background: transparent;
    border: none;
    color: var(--text-dim);
    padding: 6px 14px;
    border-radius: 7px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: 0.2s;
    text-transform: uppercase;
}

.mode-toggle button.active {
    background: var(--accent);
    color: white;
}

.result-container {
    margin-top: 2rem;
    padding: 20px;
    background: linear-gradient(145deg, rgba(157, 78, 221, 0.05), rgba(0, 0, 0, 0));
    border-radius: 18px;
    border: 1px solid rgba(157, 78, 221, 0.15);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.result-container.active {
    opacity: 1;
    transform: translateY(0);
}

.label {
    display: block;
    color: var(--text-dim);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

.mass-output {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

#massValue, #solResult {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    text-shadow: 0 0 20px var(--accent-glow);
}

.unit {
    color: var(--text-dim);
    font-size: 1rem;
    font-weight: 500;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hidden {
    display: none;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success);
}