/* ═══════════════════════════════════════════
   TrainControl — Header
   ═══════════════════════════════════════════ */

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--gap-lg);
    background: var(--bg-header);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--border-light);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
}

.header-logo {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

.header-title {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.02em;
    color: var(--tc-blue-dark);
}

/* Status dot */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-tertiary);
    margin-left: var(--gap-xs);
    transition: background var(--duration-med) ease;
}
.status-dot.connected {
    background: var(--tc-green);
    box-shadow: 0 0 6px rgba(77,166,120,0.5);
}

/* Connect button */
.btn-connect {
    padding: 6px 16px;
    font-size: 0.82rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}
.btn-connect:hover {
    background: rgba(255,255,255,0.8);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.btn-connect.connected {
    color: var(--tc-green);
    border-color: rgba(77,166,120,0.3);
}

/* Power button */
.btn-power {
    padding: 6px 20px;
    font-size: 0.82rem;
    font-weight: 700;
    font-family: var(--font-sans);
    border: none;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}
.btn-power[data-state="off"] {
    background: var(--tc-red);
    color: var(--text-on-accent);
}
.btn-power[data-state="on"] {
    background: var(--tc-green);
    color: var(--text-on-accent);
}
.btn-power:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

/* Icon buttons */
.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--duration-fast) ease;
}
.btn-icon:hover {
    background: rgba(255,255,255,0.85);
    color: var(--text-primary);
}