/* Basic page alignment with your theme */
#bloch-intro {
    text-align: center;
    margin-top: 1.5rem;
    margin-bottom: 2rem;
}

#bloch-intro h1 {
    margin-bottom: 0.5rem;
}

#bloch-intro .lead {
    color: #c8d3ff;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

#bloch-canvas {
    max-width: 420px;
    width: 100%;
    background: radial-gradient(circle at 50% 20%, #1f2937, #020617);
    border-radius: 999px;
    box-shadow: 0 0 40px rgba(56, 189, 248, 0.25),
                0 0 60px rgba(59, 130, 246, 0.25);
    cursor: grab;
    touch-action: none; /* pointer-drag rotation on touch devices */
}

#bloch-canvas.dragging {
    cursor: grabbing;
}

#bloch-intro .hint {
    color: #9ca3af;
    font-size: 0.8rem;
    margin-top: 0.6rem;
}

.hidden {
    display: none;
}

/* Circuit layout */

#circuit-section {
    margin-top: 1rem;
}

.qc-layout {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.qc-left,
.qc-right {
    flex: 1 1 280px;
    min-width: 260px;
}

.qc-block {
    background: rgba(20, 26, 46, 0.96);
    border-radius: 1rem;
    padding: 1rem 1.2rem;
    margin-bottom: 1rem;
    box-shadow: 0 6px 26px rgba(8, 13, 30, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.4);
}

.qc-block h3 {
    margin-top: 0;
    margin-bottom: 0.6rem;
    font-size: 1rem;
    color: #e5e7eb;
}

#qubit-basis-selects label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
}

#qubit-basis-selects select,
#num-qubits-select {
    background: #020617;
    color: #e5e7eb;
    border-radius: 6px;
    border: 1px solid #475569;
    padding: 0.25rem 0.4rem;
    font-size: 0.85rem;
    font-family: 'IBM Plex Mono', monospace;
}

.tiny-hint {
    font-size: 0.75rem;
    color: #9ca3af;
    margin-top: 0.5rem;
}

/* Gate palette */

#gate-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.gate-btn {
    border-radius: 0.6rem;
    border: 1px solid #4b5563;
    background: #020617;
    color: #e5e7eb;
    font-size: 0.8rem;
    padding: 0.25rem 0.55rem;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    transition: background 0.15s ease-out, border-color 0.15s ease-out, transform 0.12s ease-out;
}

.gate-btn:hover {
    background: #111827;
    border-color: #60a5fa;
    transform: translateY(-1px);
}

.gate-btn.active {
    background: #1d4ed8;
    border-color: #93c5fd;
}

/* Circuit grid */


/* the grid is ~484px wide — scroll it inside its panel instead of overflowing */
.circuit-grid-scroll {
    overflow-x: auto;
    padding-bottom: 6px;
}

#circuit-grid {
    display: grid;
    grid-template-columns: 50px repeat(8, 52px);
    gap: 0.15rem;
    align-items: center;
    font-size: 0.75rem;
    position: relative;
    width: max-content;
}

.circuit-label-cell {
    text-align: right;
    padding-right: 0.3rem;
    color: #9ca3af;
    font-size: 0.78rem;
}

/* each qubit row gets a faint horizontal wire */
.circuit-cell {
    height: 32px;
    border-radius: 0.4rem;
    border: 1px dashed transparent; /* no heavy box look by default */
    background:
        linear-gradient(to right, #4b5563 50%, #4b5563 50%) center/100% 1px no-repeat,
        rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
}



/* when gate present, show a “brick” on the wire */
.circuit-cell.has-gate {
    border-style: solid;
    border-color: #60a5fa;
    background:
        linear-gradient(to right, #4b5563 50%, #4b5563 50%) center/100% 1px no-repeat,
        radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.35), rgba(15, 23, 42, 0.95));
}

.circuit-gate-label {
    font-size: 0.78rem;
    color: #e5e7eb;
}

.circuit-gate-ctl {
    font-size: 0.9rem;
    color: #f97316;
}

.circuit-wire {
    position: absolute;
    left: 50%;
    width: 2px;
    background: #4b5563;
}

/* Buttons */

#run-btn,
#clear-circuit-btn {
    font-family: 'IBM Plex Mono', monospace;
    border-radius: 0.6rem;
    padding: 0.35rem 0.7rem;
    font-size: 0.85rem;
    cursor: pointer;
    border: 1px solid #4b5563;
    background: #020617;
    color: #e5e7eb;
    margin-right: 0.3rem;
}

#run-btn:hover {
    background: #16a34a;
    border-color: #4ade80;
}

#clear-circuit-btn.secondary:hover {
    background: #1f2937;
}

/* Output */

.state-output {
    font-size: 0.78rem;
    white-space: pre-wrap;
    color: #e5e7eb;
    max-height: 320px;
    overflow-y: auto;
}

.state-output .math-line {
    white-space: normal;
    overflow-x: auto;
    padding: 0.25rem 0;
    font-size: 1rem;
}

.state-output .section-label {
    color: #9ca3af;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin: 0.7rem 0 0.2rem;
}

.state-output .gate-seq {
    font-size: 0.75rem;
    color: #cbd5e1;
    white-space: pre-wrap;
    margin: 0;
}





.system-preset-row {
    display: block;
    margin: 0.4rem 0 0.6rem 0;
    font-size: 0.85rem;
}