:root {
    --bg: #0f0f1a;
    --card: #1a1a2e;
    --border: #2a2a4a;
    --text: #e0e0e0;
    --text2: #888;
    --accent: #4a9eff;
    --accent2: #2d7dd2;
    --green: #4caf50;
    --red: #e53935;
    --orange: #ff9800;
    --input-bg: #12122a;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Connection Bar */
#conn-bar {
    background: var(--card);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.conn-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.app-title {
    font-weight: 700;
    font-size: 16px;
    color: var(--accent);
    margin-right: 4px;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}
.status-dot.disconnected { background: var(--red); }
.status-dot.connecting { background: var(--orange); animation: pulse 1s infinite; }
.status-dot.connected { background: var(--green); }

@keyframes pulse { 50% { opacity: 0.4; } }

#conn-bar input, #conn-bar select {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 8px;
    border-radius: 4px;
    font-size: 13px;
}

#mqtt-broker { flex: 1; min-width: 120px; }
#mqtt-port { width: 65px; }
#mqtt-imei { flex: 1; min-width: 150px; }
.conn-label { font-size: 12px; color: var(--text2); white-space: nowrap; }

/* Tab Navigation */
#tab-nav {
    display: flex;
    overflow-x: auto;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
#tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
    background: none;
    border: none;
    color: var(--text2);
    padding: 10px 16px;
    font-size: 13px;
    white-space: nowrap;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}
.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Tab Panels */
.tab-panel { display: none; padding: 12px; }
.tab-panel.active { display: block; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 12px;
}
.card h3 {
    font-size: 14px;
    color: var(--accent);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

/* Status Grid */
.status-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 12px;
}
.status-grid label {
    color: var(--text2);
    font-size: 13px;
}
.status-grid span {
    font-size: 13px;
    word-break: break-all;
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 8px 12px;
    align-items: center;
}
.form-grid label {
    font-size: 13px;
    color: var(--text2);
    white-space: nowrap;
}

/* Inputs */
input[type="text"],
input[type="number"],
input[type="password"],
select {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 7px 10px;
    border-radius: 4px;
    font-size: 13px;
    width: 100%;
}

input[type="number"] { width: 100%; }

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

/* Buttons */
button {
    background: var(--border);
    color: var(--text);
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
}
button:active { opacity: 0.7; }
button.primary { background: var(--accent2); color: #fff; }
button.danger { background: var(--red); color: #fff; }

.tab-actions {
    display: flex;
    gap: 8px;
    padding: 8px 0;
    position: sticky;
    bottom: 0;
    background: var(--bg);
    border-top: 1px solid var(--border);
    margin: 0 -12px;
    padding: 12px;
}
.tab-actions button { flex: 1; padding: 12px; font-size: 14px; }

.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-row button { flex: 1; min-width: 100px; }

.status-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 8px 0;
}

/* Ignition */
.ign-grid { display: flex; flex-direction: column; gap: 8px; }
.ign-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.ign-row label { font-size: 13px; min-width: 150px; }
.ign-inline {
    font-size: 12px;
    color: var(--text2);
    display: flex;
    align-items: center;
    gap: 4px;
}
.ign-inline input {
    width: 70px;
    padding: 4px 6px;
    font-size: 12px;
}

/* Data Acquisition */
.acq-mode-tabs { display: flex; gap: 4px; margin-bottom: 10px; }
.acq-tab {
    flex: 1;
    padding: 6px;
    font-size: 12px;
    border-radius: 4px;
}
.acq-tab.active { background: var(--accent2); color: #fff; }

.acq-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.acq-table th, .acq-table td {
    padding: 6px 8px;
    border: 1px solid var(--border);
    text-align: left;
}
.acq-table th {
    background: var(--input-bg);
    color: var(--text2);
    font-weight: 500;
}
.acq-table input {
    width: 80px;
    padding: 4px 6px;
}

/* SIM Tabs */
.sim-tabs { display: flex; gap: 4px; margin: 10px 0; }
.sim-tab {
    flex: 1;
    padding: 6px;
    font-size: 12px;
    border-radius: 4px;
}
.sim-tab.active { background: var(--accent2); color: #fff; }
.sim-panel { display: none; }
.sim-panel.active { display: block; }

/* BLE Devices */
.ble-device {
    display: grid;
    grid-template-columns: 1fr 100px 80px 40px;
    gap: 6px;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    align-items: center;
}
.ble-device:last-child { border-bottom: none; }
.ble-device input, .ble-device select {
    font-size: 12px;
    padding: 4px 6px;
}

/* Log */
.log-card { display: flex; flex-direction: column; height: calc(100vh - 200px); }
.log-output {
    flex: 1;
    overflow-y: auto;
    background: var(--input-bg);
    border-radius: 4px;
    padding: 8px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    line-height: 1.4;
    margin-bottom: 8px;
    white-space: pre-wrap;
    word-break: break-all;
}
.log-input {
    display: flex;
    gap: 6px;
}
.log-input input { flex: 1; }
.log-line-tx { color: var(--accent); }
.log-line-rx { color: var(--green); }
.log-line-err { color: var(--red); }
.log-line-info { color: var(--text2); }

/* OTA */
.ota-status {
    margin-top: 10px;
    padding: 8px;
    border-radius: 4px;
    background: var(--input-bg);
    font-size: 13px;
}

/* Toast */
#toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 13px;
    z-index: 999;
    display: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
#toast.show { display: block; animation: fadeIn 0.3s; }
#toast.success { border-color: var(--green); }
#toast.error { border-color: var(--red); }

@keyframes fadeIn { from { opacity: 0; transform: translateX(-50%) translateY(10px); } }

/* Responsive */
@media (max-width: 480px) {
    .conn-row { gap: 4px; }
    #mqtt-broker { width: 110px; }
    #mqtt-imei { width: 130px; }
    .tab-btn { padding: 8px 12px; font-size: 12px; }
    .form-grid { gap: 6px 8px; }
    .acq-table input { width: 65px; }
}