:root {
    --bg-color: #1a1a1a;
    --text-primary: #ffffff;
    --text-dim: #6b7280;
    --accent: #3b82f6;
    --accent-dim: rgba(59, 130, 246, 0.2);
    --font-mono: 'Space Mono', monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.terminal-container {
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--text-dim);
    padding-bottom: 1rem;
    font-size: 0.8rem;
}

.brand {
    font-weight: 700;
    letter-spacing: -1px;
}

.status-line {
    color: var(--text-dim);
}

#status {
    color: var(--accent);
    font-weight: 700;
}

.display-area {
    text-align: center;
    padding: 2rem 0;
}

.label {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
}

.big-number {
    font-size: 5rem;
    line-height: 1;
    font-weight: 700;
    letter-spacing: -2px;
}

.unit {
    font-size: 1rem;
    color: var(--text-dim);
    margin-top: 0.5rem;
}

.progress-container {
    width: 100%;
    height: 4px;
    background: var(--accent-dim);
    position: relative;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.2s ease;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    border-top: 1px solid var(--text-dim);
    padding-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
}

.stat-val {
    font-size: 1.2rem;
    font-weight: 700;
}

.stat-unit {
    font-size: 0.7rem;
    color: var(--text-dim);
    font-weight: 400;
}

.controls {
    text-align: center;
    margin-top: 1rem;
}

.btn-primary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-dim);
    padding: 1rem 2rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    border-color: var(--text-dim);
    color: var(--text-dim);
    background: transparent;
}

@media (max-width: 480px) {
    .big-number {
        font-size: 3.5rem;
    }

    .stats-row {
        gap: 0.5rem;
    }
}