:root {
    --bg: #1a1a2e;
    --bg-card: #16213e;
    --bg-input: #0f3460;
    --text: #ffffff;
    --text-dim: #8888aa;
    --text-muted: #666699;
    --accent: #ff4081;
    --accent-hover: #ff79a8;
    --border: #2a2a4e;
    --success: #4caf50;
    --error: #f44336;
    --warn: #ff9800;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    min-height: 100vh;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 24px 16px;
}

h1 {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 4px;
    color: var(--accent);
}

.subtitle {
    color: var(--text-dim);
    font-size: 13px;
    margin: 0 0 24px;
}

.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
}

.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dim);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
    appearance: auto;
}

select:hover, select:focus {
    border-color: var(--accent);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.checkbox-group label {
    margin: 0;
    cursor: pointer;
    text-transform: none;
    letter-spacing: normal;
    font-size: 14px;
    color: var(--text);
}

.btn {
    display: block;
    width: 100%;
    padding: 14px 24px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    background: var(--border);
    cursor: not-allowed;
    transform: none;
}

#log {
    background: #0d1117;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-dim);
    min-height: 120px;
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
    margin: 0;
}

#log .info    { color: #58a6ff; }
#log .success { color: var(--success); }
#log .error   { color: var(--error); }
#log .warn    { color: var(--warn); }

.instructions {
    margin-top: 16px;
}

.instructions h2 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 12px;
}

.instructions h3 {
    font-size: 14px;
    color: var(--accent);
    margin: 0 0 8px;
}

.instructions ol {
    margin: 0;
    padding-left: 20px;
    color: var(--text-dim);
    font-size: 13px;
    line-height: 1.8;
}

.instructions li {
    margin-bottom: 2px;
}

.instructions .key {
    display: inline-block;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 6px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 12px;
    color: var(--text);
}

.hidden {
    display: none !important;
}

.status-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.ready     { background: #1b5e20; color: #a5d6a7; }
.status-badge.connected { background: #0d47a1; color: #90caf9; }
.status-badge.flashing  { background: #e65100; color: #ffcc80; }
.status-badge.done      { background: #1b5e20; color: #a5d6a7; }
.status-badge.error     { background: #b71c1c; color: #ef9a9a; }

#status-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-dim);
}

#progress-container {
    margin-top: 12px;
}

#progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
    display: none;
}

#progress-bar.active {
    display: block;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.3s;
}

#progress-text {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 4px;
}

@media (max-width: 480px) {
    .container {
        padding: 16px 12px;
    }
    h1 {
        font-size: 20px;
    }
    .card {
        padding: 16px;
    }
}