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

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-panel: #1a2235;
    --bg-lcd: #0d1a0d;
    --border: #2a3550;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #f97316;
    --accent-dim: rgba(249, 115, 22, 0.15);
    --lcd-green: #4ade80;
    --lcd-dim: #166534;
    --danger: #ef4444;
    --success: #22c55e;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand h1 {
    font-size: 1.15rem;
    font-weight: 700;
}

.brand h1 span.accent { color: var(--accent); }

.btn-back-hub {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
    margin-left: 0.5rem;
}

.btn-back-hub:hover {
    color: var(--text-primary);
}

.version-label {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
}

.mode-tabs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.mode-tab {
    padding: 0.45rem 0.9rem;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-tab:hover { border-color: var(--accent); color: var(--text-primary); }
.mode-tab.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

.main-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 1rem;
    padding: 1rem 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

@media (max-width: 900px) {
    .main-layout { grid-template-columns: 1fr; }
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
}

.lcd-display {
    font-family: 'Share Tech Mono', monospace;
    background: var(--bg-lcd);
    border: 2px inset #1a2e1a;
    border-radius: 6px;
    padding: 1rem;
    min-height: 100px;
    color: var(--lcd-green);
    font-size: 1.1rem;
    line-height: 1.6;
    word-break: break-all;
    margin-bottom: 0.75rem;
    box-shadow: inset 0 0 20px rgba(74, 222, 128, 0.05);
}

.lcd-current {
    font-size: 1.4rem;
    color: var(--lcd-dim);
    min-height: 1.5em;
    margin-bottom: 0.5rem;
    letter-spacing: 0.15em;
}

.lcd-current.active { color: var(--lcd-green); }

.controls-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.control-group label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.control-group input[type="range"] { width: 120px; }
.control-group select {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.key-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
}

.straight-key {
    width: 200px;
    height: 120px;
    background: linear-gradient(180deg, #2a3550 0%, #1a2235 100%);
    border: 3px solid #3b4a6b;
    border-radius: 12px 12px 8px 8px;
    cursor: pointer;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 1rem;
    user-select: none;
    transition: transform 0.05s, box-shadow 0.1s;
}

.straight-key .key-lever {
    width: 24px;
    height: 60px;
    background: linear-gradient(90deg, #64748b, #94a3b8, #64748b);
    border-radius: 4px;
    transition: transform 0.05s;
}

.straight-key.down,
.straight-key:active {
    transform: translateY(4px);
    box-shadow: inset 0 4px 12px rgba(0,0,0,0.4);
}

.straight-key.down .key-lever,
.straight-key:active .key-lever {
    transform: translateY(8px);
}

.paddle-area {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.paddle-btn {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 3px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
    transition: all 0.1s;
}

.paddle-btn.dit.active,
.paddle-btn.dah.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    transform: scale(0.95);
}

.key-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.sidebar .panel { margin-bottom: 1rem; }

.sidebar h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.morse-chart {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    max-height: 280px;
    overflow-y: auto;
}

.morse-char {
    padding: 4px 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.7rem;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.15s;
}

.morse-char:hover { border-color: var(--accent); }
.morse-char .letter { color: var(--accent); font-weight: 700; }
.morse-char .code { color: var(--lcd-green); font-size: 0.65rem; }

.abbrev-table {
    font-size: 0.75rem;
    width: 100%;
    border-collapse: collapse;
}

.abbrev-table td {
    padding: 4px 6px;
    border-bottom: 1px solid var(--border);
}

.abbrev-table td:first-child {
    font-family: 'Share Tech Mono', monospace;
    color: var(--accent);
    font-weight: 600;
    width: 3em;
}

/* RX / Koch panels */
.rx-panel, .koch-panel, .ref-panel { display: none; }
.rx-panel.active, .koch-panel.active, .ref-panel.active,
.tx-panel.active { display: block; }

.rx-input {
    width: 100%;
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.1rem;
    padding: 0.75rem;
    background: var(--bg-lcd);
    border: 2px inset #1a2e1a;
    border-radius: 6px;
    color: var(--lcd-green);
    margin: 0.75rem 0;
}

.rx-input:focus { outline: 2px solid var(--accent); }

.btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.score-bar {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin: 0.75rem 0;
    font-size: 0.85rem;
}

.score-bar span { color: var(--text-secondary); }
.score-bar strong { color: var(--lcd-green); }

.feedback {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.feedback.ok { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.feedback.err { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

.ref-panel .morse-chart { max-height: none; grid-template-columns: repeat(6, 1fr); }

.audio-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem;
    background: var(--accent-dim);
    border-top: 1px solid var(--accent);
    text-align: center;
    z-index: 100;
    display: none;
}

.audio-banner.show { display: block; }

.audio-banner button {
    margin-left: 0.5rem;
    padding: 0.35rem 0.75rem;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.hidden { display: none !important; }

.sidebar.hidden { display: none; }