video#cameraFeed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: var(--z-camera);
    background: #0a111a;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

canvas#drawingCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-reticle);
    touch-action: none; /* 防止滑動頁面 */
}

.reticle-overlay {
    position: absolute;
    z-index: var(--z-overlay);
    width: 70vmin;
    height: 70vmin;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border: 3px dashed rgba(255, 215, 0, 0.85);
    border-radius: 50%;
    pointer-events: none;
    box-sizing: border-box;
    transition: left 0.15s ease-out, top 0.15s ease-out;
}

.reticle-overlay.hidden {
    display: none;
}

.capture-reticle-btn {
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    background: var(--accent-color);
    border: none;
    border-radius: 24px;
    cursor: pointer;
    box-shadow: 0 2px 12px rgba(255, 215, 0, 0.4);
    transition: transform 0.15s, box-shadow 0.15s;
}

.capture-reticle-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 16px rgba(255, 215, 0, 0.5);
}

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

.camera-capture-bar {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    z-index: var(--z-capture-bar);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
}

.camera-capture-bar.hidden {
    display: none !important;
}

.camera-mode-switch {
    display: inline-flex;
    gap: 8px;
    padding: 8px;
    border-radius: 999px;
    background: rgba(8, 14, 28, 0.68);
    border: 1px solid rgba(255,255,255,0.12);
    backdrop-filter: blur(14px);
}

.camera-mode-btn {
    border: none;
    border-radius: 999px;
    padding: 10px 14px;
    background: transparent;
    color: rgba(255,255,255,0.82);
    font-size: 13px;
    font-weight: 700;
}

.camera-mode-btn.active {
    background: linear-gradient(135deg, rgba(255,214,102,0.96) 0%, rgba(255,154,59,0.96) 100%);
    color: #201204;
    box-shadow: 0 10px 20px rgba(255, 160, 40, 0.24);
}

.shutter-btn {
    position: relative;
    width: 84px;
    height: 84px;
    border: none;
    border-radius: 50%;
    background: rgba(255,255,255,0.16);
    box-shadow: 0 18px 36px rgba(0,0,0,0.32);
    backdrop-filter: blur(14px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.12s ease-out, box-shadow 0.12s ease-out;
}

.shutter-btn:active,
.shutter-btn.is-firing {
    transform: scale(0.9);
}

.shutter-btn-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 3px solid rgba(255,255,255,0.88);
}

.shutter-btn-core {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(233,241,255,0.9) 100%);
}

body.immersive-camera-mode .selection-instruction {
    display: none !important;
}

body.immersive-camera-mode .reticle-overlay {
    pointer-events: none;
}

.reticle-center-hint {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.reticle-center-hint {
    top: 22%;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(8, 14, 28, 0.78);
    color: rgba(255,255,255,0.92);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.03em;
    backdrop-filter: blur(8px);
}

.reticle-center-hint.hidden {
    display: none !important;
}

.reticle-capture-hotspot {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 124px;
    height: 124px;
    border: none;
    border-radius: 50%;
    background: radial-gradient(circle at center, rgba(255, 215, 0, 0.18) 0%, rgba(255, 215, 0, 0.08) 48%, rgba(255, 255, 255, 0.01) 72%);
    color: #fff8da;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-align: center;
    pointer-events: auto;
    touch-action: manipulation;
    z-index: 3;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.18);
    transition: transform 0.12s ease-out, box-shadow 0.12s ease-out, background 0.12s ease-out;
}

.reticle-capture-hotspot:active,
.reticle-capture-hotspot.is-firing {
    transform: translate(-50%, -50%) scale(0.94);
    background: radial-gradient(circle at center, rgba(255, 215, 0, 0.32) 0%, rgba(255, 180, 59, 0.18) 52%, rgba(255, 255, 255, 0.03) 76%);
}

.reticle-capture-hotspot.hidden {
    display: none !important;
}

.reticle-capture-icon {
    font-size: 28px;
    line-height: 1;
}

.reticle-capture-text {
    max-width: 88px;
    font-size: 12px;
    font-weight: 800;
    line-height: 1.25;
}

body.immersive-camera-mode .tutorial-exit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}