:root {
    --bg-color: #0d1117;
    /* Deep charcoal/dark blue */
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent-cyan: #00f3ff;
    /* Neon Cyan */
    --accent-green: #0aff00;
    /* Neon Green */
    --accent-hover: #00c4ce;
    --input-bg: #1e293b;
    --glass-blur: 12px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 20px;
    font-size: 16px;
    line-height: 1.5;
}

.all-tools-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    text-decoration: none;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    transition: all 0.2s ease;
    z-index: 100;
}

.all-tools-btn:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    background: rgba(0, 243, 255, 0.05);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.1);
}

.app-container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

header {
    text-align: center;
    margin-bottom: 10px;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 4px;
    background: linear-gradient(90deg, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* CARDS & GLASSMORPHISM */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* VOLUME SELECTOR */
.volume-selector {
    display: flex;
    gap: 16px;
}

.vol-btn {
    flex: 1;
    background: transparent;
    border: 2px solid var(--card-border);
    color: var(--text-secondary);
    padding: 16px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.vol-btn.active {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0, 243, 255, 0.05);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.1);
}

/* INPUTS */
label {
    display: block;
    margin-bottom: 12px;
    font-size: 1.1rem;
    font-weight: 500;
}

input[type="number"] {
    width: 100%;
    background: var(--input-bg);
    border: 2px solid var(--card-border);
    color: var(--text-primary);
    padding: 16px;
    border-radius: 12px;
    font-size: 1.5rem;
    font-family: 'Roboto Mono', monospace;
    outline: none;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    border-color: var(--accent-cyan);
}

/* TOGGLES */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 30px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--input-bg);
    border: 1px solid var(--card-border);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: rgba(0, 243, 255, 0.2);
    border-color: var(--accent-cyan);
}

input:checked+.slider:before {
    transform: translateX(22px);
    background-color: var(--accent-cyan);
}

.toggle-label {
    font-size: 1rem;
    user-select: none;
}

/* EXTRA OPTIONS */
.extra-options {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--card-border);
    animation: fadeIn 0.3s ease;
}

.extra-options.hidden {
    display: none;
}

.helper-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.radio-group {
    display: flex;
    gap: 12px;
}

.radio-btn {
    flex: 1;
    position: relative;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.radio-btn input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-btn.selected {
    border-color: var(--accent-green);
    background: rgba(10, 255, 0, 0.05);
    color: var(--accent-green);
}

/* TABLE */
.output-section {
    border: 1px solid rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.05);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.results-header h2 {
    font-size: 1.2rem;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.eff-rxn-tag {
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: 'Roboto Mono', monospace;
    color: var(--text-secondary);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
}

.results-table th {
    text-align: left;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--card-border);
}

.results-table td {
    padding: 16px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 1.1rem;
}

.results-table td:last-child {
    text-align: right;
    font-family: 'Roboto Mono', monospace;
    color: var(--accent-cyan);
    font-weight: 700;
    font-size: 1.25rem;
}

.results-table tr:last-child td {
    border-bottom: none;
}

/* FOOTER */
footer {
    text-align: center;
    padding-bottom: 40px;
}

.disclaimer {
    font-size: 0.8rem;
    color: #64748b;
    max-width: 400px;
    margin: 0 auto;
    line-height: 1.4;
}

.text-right {
    text-align: right;
}

/* ANIMATIONS */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .app-container {
        gap: 16px;
    }

    .card {
        padding: 20px;
    }

    h1 {
        font-size: 1.5rem;
    }
}