/* ==================== StudyPlus YT Floating Widget ==================== */

/* Floating Button (Bottom-Left) */
.studyplus-widget {
    position: fixed;
    bottom: 20px;
    left: 30px;
    z-index: 1000;
    opacity: 0;
    transform: scale(0) translateY(20px);
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    pointer-events: none;
}

.studyplus-widget.visible {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: all;
}

.studyplus-widget-btn {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(145deg, #6366F1 0%, #4F46E5 40%, #10B981 100%);
    border: 1.5px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow:
        0 4px 16px rgba(79, 70, 229, 0.35),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    transition: all 0.3s ease;
    animation: studyplus-pulse 3s ease-in-out infinite;
    position: relative;
}

.studyplus-widget-btn:hover {
    transform: scale(1.08) translateY(-2px);
    box-shadow:
        0 8px 28px rgba(79, 70, 229, 0.5),
        0 2px 6px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.25);
}

/* Text logo "S+" */
.studyplus-widget-icon {
    font-family: 'Inter', -apple-system, sans-serif;
    font-size: 22px;
    font-weight: 800;
    color: white;
    letter-spacing: -1px;
    line-height: 1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    pointer-events: none;
}

.studyplus-widget-plus {
    font-size: 15px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.85);
    vertical-align: super;
    margin-left: -1px;
}

/* Notification dot */
.studyplus-widget-btn::after {
    content: '';
    position: absolute;
    top: -3px;
    right: -3px;
    width: 12px;
    height: 12px;
    background: #ef4444;
    border-radius: 50%;
    border: 2px solid #0a0a0a;
    animation: notif-blink 1.5s infinite;
}

.studyplus-widget-btn.seen::after {
    display: none;
}

/* Tooltip */
.studyplus-tooltip {
    position: absolute;
    bottom: 66px;
    left: 0;
    background: rgba(15, 15, 25, 0.95);
    color: white;
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 13px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.studyplus-widget-btn:hover .studyplus-tooltip {
    opacity: 1;
}

@keyframes studyplus-pulse {
    0%, 100% {
        box-shadow:
            0 4px 16px rgba(79, 70, 229, 0.35),
            0 1px 3px rgba(0, 0, 0, 0.2),
            inset 0 1px 0 rgba(255, 255, 255, 0.15);
    }
    50% {
        box-shadow:
            0 6px 24px rgba(79, 70, 229, 0.45),
            0 1px 3px rgba(0, 0, 0, 0.2),
            inset 0 1px 0 rgba(255, 255, 255, 0.15);
    }
}

@keyframes notif-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ==================== Popup Panel (Centered on Desktop) ==================== */

/* Backdrop overlay */
.studyplus-popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.studyplus-popup-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.studyplus-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 420px;
    max-height: min(460px, calc(100vh - 80px));
    height: auto;
    background: rgba(20, 20, 30, 0.98);
    backdrop-filter: blur(24px);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.08);
    z-index: 999;
    display: flex;
    flex-direction: column;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    overflow: hidden;
}

.studyplus-popup.open {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    pointer-events: all;
}

/* Header */
.studyplus-popup-header {
    padding: 20px 20px 16px;
    background: linear-gradient(135deg, #4F46E5, #10B981);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    position: relative;
    overflow: hidden;
}

.studyplus-popup-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.studyplus-popup-header-info {
    position: relative;
    z-index: 1;
}

.studyplus-popup-header-info h3 {
    color: white;
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 4px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.studyplus-popup-header-info p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    margin: 0;
    font-weight: 400;
}

.studyplus-popup-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 14px;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.studyplus-popup-close:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: rotate(90deg);
}

/* Body */
.studyplus-popup-body {
    padding: 16px 20px;
    overflow-y: auto;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: rgba(79, 70, 229, 0.3) transparent;
}

.studyplus-popup-body::-webkit-scrollbar {
    width: 4px;
}

.studyplus-popup-body::-webkit-scrollbar-thumb {
    background: rgba(79, 70, 229, 0.3);
    border-radius: 4px;
}

/* Tagline */
.studyplus-tagline {
    font-size: 14px;
    color: #a0aec0;
    line-height: 1.6;
    margin-bottom: 16px;
}

.studyplus-tagline strong {
    color: #e2e8f0;
}

/* Features Mini Grid */
.studyplus-features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

.studyplus-feature-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    transition: all 0.2s ease;
}

.studyplus-feature-chip:hover {
    background: rgba(79, 70, 229, 0.1);
    border-color: rgba(79, 70, 229, 0.3);
    transform: translateY(-1px);
}

.studyplus-feature-chip .chip-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.studyplus-feature-chip .chip-text {
    font-size: 12px;
    color: #cbd5e0;
    font-weight: 500;
    line-height: 1.3;
}

/* IITM Badge */
.studyplus-iitm-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.15), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: 12px;
    margin-bottom: 16px;
}

.studyplus-iitm-badge .badge-icon {
    font-size: 24px;
}

.studyplus-iitm-badge .badge-text {
    font-size: 13px;
    color: #a0aec0;
    line-height: 1.4;
}

.studyplus-iitm-badge .badge-text strong {
    color: #a78bfa;
}

/* Footer CTA */
.studyplus-popup-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.studyplus-cta-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    background: linear-gradient(135deg, #4F46E5, #10B981);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}

.studyplus-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(79, 70, 229, 0.5);
    color: white;
}

.studyplus-cta-btn svg {
    width: 16px;
    height: 16px;
    fill: white;
    transition: transform 0.2s ease;
}

.studyplus-cta-btn:hover svg {
    transform: translateX(3px);
}

.studyplus-learn-more {
    display: block;
    text-align: center;
    color: #718096;
    font-size: 12px;
    text-decoration: none;
    transition: color 0.2s ease;
}

.studyplus-learn-more:hover {
    color: #a78bfa;
}

/* ==================== Mobile Responsive ==================== */
@media (max-width: 768px) {
    .studyplus-widget {
        bottom: 20px;
        left: 20px;
    }

    .studyplus-widget-btn {
        width: 48px;
        height: 48px;
        border-radius: 14px;
    }

    .studyplus-widget-icon {
        font-size: 19px;
    }

    .studyplus-widget-plus {
        font-size: 13px;
    }

    .studyplus-popup {
        top: auto;
        left: 20px;
        bottom: 90px;
        width: calc(100vw - 40px);
        max-height: calc(88vh - 120px);
        transform: translateY(20px) scale(0.95);
    }

    .studyplus-popup.open {
        transform: translateY(0) scale(1);
    }

    .studyplus-popup-overlay {
        backdrop-filter: none;
    }

    .studyplus-features-grid {
        grid-template-columns: 1fr;
    }
}