/* PWA Install Banner */
.pwa-install-banner,
.pwa-ios-banner {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #fff;
    padding: 16px 20px;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 10000;
    box-shadow: 0 -4px 20px rgba(251, 191, 36, 0.4);
    animation: slideUp 0.4s ease-out;
    flex-wrap: wrap;
    border-top: 2px solid #fef3c7;
}

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.pwa-banner-content {
    display: flex;
    align-items: center;
    gap: 14px;
    flex: 1;
    min-width: 200px;
}

.pwa-banner-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.pwa-banner-text h4 {
    margin: 0 0 4px 0;
    font-size: 15px;
    font-weight: 600;
}

.pwa-banner-text p {
    margin: 0;
    font-size: 13px;
    opacity: 0.85;
    line-height: 1.4;
}

.pwa-banner-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

.pwa-install-btn {
    background: linear-gradient(135deg, #facc15, #f59e0b);
    color: #1a1a2e;
    border: none;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.pwa-install-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(250, 204, 21, 0.4);
}

.pwa-dismiss-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.pwa-dismiss-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* iOS-specific banner */
.pwa-ios-steps {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 6px;
    font-size: 13px;
    opacity: 0.9;
}

.pwa-ios-steps span {
    background: rgba(255, 255, 255, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
}

/* Model download progress banner */
.pwa-model-banner {
    display: none;
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #fff;
    padding: 12px 20px;
    border-radius: 12px;
    z-index: 9999;
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
    max-width: 420px;
    width: 90%;
    animation: slideDown 0.4s ease-out;
    border: 1px solid #fef3c7;
}

@keyframes slideDown {
    from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

.pwa-model-banner-content {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.pwa-model-banner-content .icon {
    font-size: 20px;
}

.pwa-model-banner-content .text {
    font-size: 13px;
    line-height: 1.4;
}

.pwa-model-banner-content .text strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.pwa-model-progress {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    overflow: hidden;
}

.pwa-model-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #facc15, #f59e0b);
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
}

/* Hide install banner on phone screens — phones use server, no PWA install needed */
@media (max-width: 768px) {
    .pwa-install-banner,
    .pwa-ios-banner {
        display: none !important;
    }

    .pwa-model-banner {
        top: auto;
        bottom: 10px;
        border-radius: 10px;
        max-width: 95%;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   SIGN-IN PROMPT MODAL — shown after first BG removal for non-auth users
   ═══════════════════════════════════════════════════════════════════════════ */
.signin-prompt-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 99998;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.signin-prompt-modal.active {
    display: flex;
}

.signin-prompt-content {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 16px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.signin-prompt-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #94a3b8;
    padding: 4px 8px;
}

.signin-prompt-close:hover {
    color: #64748b;
}

.signin-prompt-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.signin-prompt-content h3 {
    margin: 0 0 8px;
    font-size: 22px;
    font-weight: 700;
    color: #1e293b;
}

.signin-prompt-content p {
    margin: 0 0 24px;
    color: #64748b;
    font-size: 15px;
    line-height: 1.5;
}

.signin-prompt-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.signin-prompt-btn {
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.2s;
}

.signin-prompt-btn.primary {
    background: linear-gradient(135deg, #facc15 0%, #f59e0b 100%);
    color: #1e293b;
}

.signin-prompt-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(250, 204, 21, 0.4);
}

.signin-prompt-btn.secondary {
    background: #f1f5f9;
    color: #475569;
}

.signin-prompt-btn.secondary:hover {
    background: #e2e8f0;
}

.signin-prompt-skip {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 13px;
    cursor: pointer;
    padding: 8px;
}

.signin-prompt-skip:hover {
    color: #64748b;
    text-decoration: underline;
}

/* ═══════════════════════════════════════════════════════════════════════════
   DESKTOP INSTALL SECTION — dedicated section (not floating banner)
   ═══════════════════════════════════════════════════════════════════════════ */
.desktop-install-section {
    display: none; /* Hidden by default, shown via JS for desktop */
    padding: 24px 20px;
    margin: 40px auto;
    max-width: 700px;
}

.desktop-install-section.visible {
    display: block;
}

.desktop-install-container {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    border-radius: 16px;
    padding: 28px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    box-shadow: 0 8px 30px rgba(251, 191, 36, 0.3);
    border: 1px solid #fef3c7;
}

.desktop-install-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.desktop-install-icon {
    color: #facc15;
    flex-shrink: 0;
}

.desktop-install-text h3 {
    margin: 0 0 6px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}

.desktop-install-text p {
    margin: 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.5;
}

.desktop-install-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #facc15 0%, #f59e0b 100%);
    color: #1e293b;
    border: none;
    padding: 14px 24px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.desktop-install-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(250, 204, 21, 0.4);
}

.desktop-install-btn.coming-soon-btn {
    background: rgba(250, 204, 21, 0.25);
    color: #facc15;
    border: 1px solid rgba(250, 204, 21, 0.5);
    cursor: not-allowed;
    opacity: 0.9;
}

.desktop-install-btn.coming-soon-btn:hover {
    transform: none;
    box-shadow: none;
}

@media (max-width: 768px) {
    .desktop-install-section {
        display: none !important; /* Never show on mobile */
    }
}

@media (max-width: 640px) {
    .desktop-install-container {
        flex-direction: column;
        text-align: center;
    }
    
    .desktop-install-content {
        flex-direction: column;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   PWA SPLASH SCREEN — full screen overlay while loading model (PWA only)
   ═══════════════════════════════════════════════════════════════════════════ */
.pwa-splash {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 50%, #0f0f23 100%);
    z-index: 99999;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.pwa-splash.active {
    display: flex;
}

.pwa-splash-inner {
    text-align: center;
    color: #fff;
    max-width: 400px;
    padding: 24px;
}

.pwa-splash-inner h2 {
    margin: 20px 0 12px;
    font-size: 24px;
    font-weight: 700;
    color: #facc15;
}

.pwa-splash-inner p {
    margin: 0 0 28px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    min-height: 42px;
}

.pwa-splash-progress {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.pwa-splash-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #facc15, #f59e0b, #facc15);
    background-size: 200% 100%;
    border-radius: 4px;
    width: 0%;
    transition: width 0.4s ease;
    animation: shimmer 2s linear infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.pwa-splash-percent {
    font-size: 18px;
    font-weight: 700;
    color: #facc15;
    letter-spacing: 1px;
}

/* Dark mode adjustments */
body.dark-mode .signin-prompt-content {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

body.dark-mode .signin-prompt-content h3 {
    color: #f1f5f9;
}

body.dark-mode .signin-prompt-content p {
    color: #94a3b8;
}

body.dark-mode .signin-prompt-btn.secondary {
    background: #334155;
    color: #e2e8f0;
}

body.dark-mode .signin-prompt-btn.secondary:hover {
    background: #475569;
}