/**
 * Start Overlay - Shared Styles for Reveal.js Presentations
 * StarkMind AI Summit 2025
 *
 * Mobile-responsive keyboard help overlay that enables audio autoplay
 */

@keyframes pulse-overlay {
    0%, 100% { box-shadow: 0 0 15px var(--overlay-glow); }
    50% { box-shadow: 0 0 25px var(--overlay-glow-bright); }
}

#start-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.88);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    cursor: pointer;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 1;
    transition: opacity 0.5s ease;
}

#start-overlay .overlay-box {
    background: var(--overlay-bg, rgba(26, 26, 26, 0.98));
    border: 2px solid var(--overlay-accent, #d4af37);
    border-radius: 12px;
    padding: 28px 35px;
    max-width: 500px;
    width: 85%;
    box-shadow: 0 0 40px var(--overlay-glow, rgba(212, 175, 55, 0.2));
}

/* Logo */
#start-overlay .overlay-logo {
    text-align: center;
    margin-bottom: 18px;
}

#start-overlay .overlay-logo img {
    height: 32px;
    width: auto;
    opacity: 0.9;
}

/* Title */
#start-overlay .overlay-title {
    font-family: var(--overlay-title-font, 'Playfair Display', serif);
    color: var(--overlay-accent, #d4af37);
    margin: 0 0 18px 0;
    font-size: 1.3em;
    text-align: center;
    font-weight: 400;
}

/* Keyboard grid */
#start-overlay .keyboard-grid {
    font-family: 'Inter', sans-serif;
    color: #fff;
    line-height: 1.5;
    font-size: 0.85em;
}

#start-overlay .keyboard-row {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 8px;
    margin-bottom: 6px;
}

#start-overlay .key {
    font-weight: 600;
    color: var(--overlay-accent, #d4af37);
    font-family: var(--overlay-key-font, 'Inter', sans-serif);
}

#start-overlay .tip {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--overlay-border, rgba(212, 175, 55, 0.3));
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.8em;
}

#start-overlay .tip strong {
    color: var(--overlay-tip-accent, #d4af37);
}

/* Click to begin button */
#start-overlay .begin-btn {
    text-align: center;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--overlay-border, rgba(212, 175, 55, 0.3));
}

#start-overlay .begin-btn span {
    font-family: var(--overlay-key-font, 'Inter', sans-serif);
    font-size: 0.85rem;
    color: var(--overlay-accent, #d4af37);
    border: 2px solid var(--overlay-accent, #d4af37);
    border-radius: 50px;
    padding: 10px 28px;
    display: inline-block;
    animation: pulse-overlay 2s infinite;
}

/* Version number */
#start-overlay .overlay-version {
    text-align: right;
    font-family: 'Inter', sans-serif;
    font-size: 0.6em;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 10px;
}

/* Tablet */
@media (max-width: 768px) {
    #start-overlay .overlay-box {
        padding: 22px 28px;
        max-width: 85%;
    }

    #start-overlay .overlay-logo img {
        height: 28px;
    }

    #start-overlay .overlay-title {
        font-size: 1.15em;
        margin-bottom: 14px;
    }

    #start-overlay .keyboard-grid {
        font-size: 0.8em;
    }

    #start-overlay .keyboard-row {
        grid-template-columns: 95px 1fr;
        gap: 6px;
        margin-bottom: 5px;
    }

    #start-overlay .begin-btn span {
        font-size: 0.8rem;
        padding: 9px 24px;
    }
}

/* Mobile */
@media (max-width: 480px) {
    #start-overlay .overlay-box {
        padding: 18px 22px;
        max-width: 90%;
        border-radius: 10px;
    }

    #start-overlay .overlay-logo {
        margin-bottom: 12px;
    }

    #start-overlay .overlay-logo img {
        height: 24px;
    }

    #start-overlay .overlay-title {
        font-size: 1em;
        margin-bottom: 12px;
    }

    #start-overlay .keyboard-grid {
        font-size: 0.72em;
    }

    #start-overlay .keyboard-row {
        grid-template-columns: 75px 1fr;
        gap: 4px;
        margin-bottom: 4px;
    }

    #start-overlay .tip {
        margin-top: 10px;
        padding-top: 10px;
        font-size: 0.7em;
    }

    #start-overlay .begin-btn {
        margin-top: 12px;
        padding-top: 12px;
    }

    #start-overlay .begin-btn span {
        font-size: 0.72rem;
        padding: 8px 20px;
    }
}

/* Very small screens */
@media (max-width: 360px) {
    #start-overlay .overlay-box {
        padding: 14px 16px;
    }

    #start-overlay .keyboard-row {
        grid-template-columns: 65px 1fr;
    }

    #start-overlay .keyboard-grid {
        font-size: 0.68em;
    }
}