:root {
    --background-color: #121212;
    --primary-color: #1a1a1a;
    --secondary-color: #2a2a2a;
    --accent-color: #00ff9d;
    --text-color: #e0e0e0;
    --label-color: #a0a0a0;
    --border-color: #3a3a3a;
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Roboto Mono', monospace;
}

body {
    font-family: var(--font-body);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

main {
    width: 100%;
    max-width: 500px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-family: var(--font-heading);
    color: var(--accent-color);
    font-size: 3rem;
    margin: 0;
    letter-spacing: 2px;
}

header p {
    color: var(--label-color);
    font-size: 0.9rem;
}

.calculator {
    background-color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 255, 157, 0.05);
}

.inputs {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 25px;
}

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

.input-group label {
    font-size: 0.9rem;
    color: var(--label-color);
    margin-bottom: 8px;
}

input[type="number"], select {
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 12px;
    border-radius: 4px;
    font-size: 1.1rem;
    font-family: var(--font-body);
    width: 100%;
    box-sizing: border-box; /* Ensures padding doesn't affect width */
}

input[type="number"]::placeholder {
    color: #555;
}

input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(0, 255, 157, 0.3);
}

.results-container {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
}

.results-container h2 {
    font-family: var(--font-heading);
    color: var(--accent-color);
    margin: 0 0 10px 0;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

.one-rep-max-value {
    font-size: 3.5rem;
    font-weight: bold;
    color: #fff;
    margin: 0 0 20px 0;
}

.copy-block-container {
    position: relative;
}

#copyable-output {
    background-color: var(--secondary-color);
    border: 1px dashed var(--border-color);
    color: var(--label-color);
    padding: 15px;
    border-radius: 4px;
    text-align: left;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 0.85rem;
}

#copy-button {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--accent-color);
    color: var(--background-color);
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: bold;
    transition: background-color 0.2s;
}

#copy-button:hover {
    background-color: #fff;
}

#copy-button:active {
    transform: scale(0.95);
}