* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #ff6f00 0%, #ff8f00 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 1000px;
    width: 100%;
    position: relative;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 25px;
    font-size: 32px;
}

/* Story Box */
.story-box {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    border-left: 5px solid #ff6f00;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.story-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.icon {
    font-size: 50px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.header-text strong {
    color: #e65100;
    font-size: 20px;
    display: block;
}

.header-text p {
    color: #666;
    font-size: 14px;
    margin-top: 3px;
}

.story-text {
    color: #333;
    line-height: 1.8;
    font-size: 18px;
    text-align: center;
}

/* Fan Section */
.fan-section {
    margin: 40px 0;
    display: flex;
    justify-content: center;
}

.fan-container {
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    border: 3px solid #d84315;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.fan-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 0 5px rgba(255, 111, 0, 0.3)); }
    50% { filter: drop-shadow(0 0 15px rgba(255, 111, 0, 0.6)); }
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.info-box {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border: 3px solid #1976d2;
    border-radius: 15px;
    padding: 20px;
}

.info-label {
    font-size: 18px;
    font-weight: bold;
    color: #0d47a1;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 2px solid #1976d2;
}

.info-content {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.info-item {
    font-size: 16px;
    color: #333;
}

.value {
    color: #d84315;
    font-weight: bold;
    font-size: 18px;
}

.formula-text {
    font-family: 'Courier New', monospace;
    font-size: 16px;
    color: #1565c0;
    font-weight: bold;
}

/* Question Section */
.question-section {
    margin: 30px 0;
}

.question-label {
    font-size: 20px;
    font-weight: bold;
    color: #333;
    text-align: center;
    margin-bottom: 15px;
    padding: 20px;
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border-radius: 10px;
    border-left: 5px solid #4caf50;
}

.question-text {
    font-size: 18px;
    color: #555;
    text-align: center;
    margin-bottom: 25px;
}

/* Drop Zone Container */
.drop-zone-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
    padding: 20px;
    background: linear-gradient(135deg, #fff9c4 0%, #fff59d 100%);
    border-radius: 15px;
    border: 3px solid #fbc02d;
}

.drop-label {
    font-size: 24px;
    font-weight: bold;
    color: #f57f17;
}

.drop-zone {
    min-width: 150px;
    min-height: 80px;
    background: white;
    border: 4px dashed #1976d2;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
}

.drop-zone.drag-over {
    background: #e3f2fd;
    border-color: #0d47a1;
    transform: scale(1.05);
}

.drop-zone.correct {
    background: linear-gradient(135deg, #c8e6c9 0%, #a5d6a7 100%);
    border: 4px solid #4caf50;
    animation: correct-pulse 0.6s ease;
}

.drop-zone.blink-red {
    animation: blink-red 0.5s ease 3;
}

@keyframes correct-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes blink-red {
    0%, 100% { 
        background: white;
        border-color: #1976d2;
    }
    50% { 
        background: #ffcdd2;
        border-color: #f44336;
    }
}

.drop-placeholder {
    color: #999;
    font-size: 16px;
    font-style: italic;
}

.drop-value {
    font-size: 32px;
    font-weight: bold;
    color: #1976d2;
    display: none;
}

.drop-zone.has-value .drop-placeholder {
    display: none;
}

.drop-zone.has-value .drop-value {
    display: block;
}

.drop-zone.disabled {
    pointer-events: none;
    opacity: 0.8;
}

.drop-unit {
    font-size: 24px;
    font-weight: bold;
    color: #f57f17;
}

/* Draggable Options */
.options-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.draggable-option {
    background: linear-gradient(135deg, #e1f5fe 0%, #b3e5fc 100%);
    border: 3px solid #0288d1;
    border-radius: 12px;
    padding: 25px;
    font-size: 28px;
    font-weight: bold;
    color: #01579b;
    text-align: center;
    cursor: grab;
    transition: all 0.3s ease;
    user-select: none;
}

.draggable-option:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 20px rgba(2, 136, 209, 0.4);
}

.draggable-option:active {
    cursor: grabbing;
}

.draggable-option.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
}

.draggable-option.used {
    opacity: 0.3;
    pointer-events: none;
    background: #e0e0e0;
    border-color: #9e9e9e;
    color: #757575;
}

/* Feedback */
.feedback {
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    min-height: 30px;
    margin-top: 20px;
    padding: 15px;
    border-radius: 10px;
}

.feedback.success {
    color: #4caf50;
    background: linear-gradient(135deg, #c8e6c9 0%, #a5d6a7 100%);
}

.feedback.error {
    color: #f44336;
    background: linear-gradient(135deg, #ffcdd2 0%, #ef9a9a 100%);
}

/* Reset Button */
.reset-btn {
    display: block;
    margin: 20px auto;
    background: #4caf50;
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: #388e3c;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.4);
}

.reset-btn:active {
    transform: translateY(0);
}

/* Balloons Animation */
.balloons-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    display: none;
}

.balloons-container.active {
    display: block;
}

.balloon {
    position: absolute;
    bottom: -100px;
    font-size: 60px;
    animation: rise 4s ease-out forwards;
    opacity: 0;
}

.balloon:nth-child(1) { animation-delay: 0s; }
.balloon:nth-child(2) { animation-delay: 0.1s; }
.balloon:nth-child(3) { animation-delay: 0.2s; }
.balloon:nth-child(4) { animation-delay: 0.3s; }
.balloon:nth-child(5) { animation-delay: 0.4s; }
.balloon:nth-child(6) { animation-delay: 0.5s; }
.balloon:nth-child(7) { animation-delay: 0.6s; }
.balloon:nth-child(8) { animation-delay: 0.7s; }
.balloon:nth-child(9) { animation-delay: 0.8s; }
.balloon:nth-child(10) { animation-delay: 0.9s; }
.balloon:nth-child(11) { animation-delay: 1s; }
.balloon:nth-child(12) { animation-delay: 1.1s; }
.balloon:nth-child(13) { animation-delay: 1.2s; }
.balloon:nth-child(14) { animation-delay: 1.3s; }
.balloon:nth-child(15) { animation-delay: 1.4s; }
.balloon:nth-child(16) { animation-delay: 1.5s; }
.balloon:nth-child(17) { animation-delay: 1.6s; }

@keyframes rise {
    0% {
        bottom: -100px;
        opacity: 0;
        transform: translateX(0) rotate(0deg);
    }
    10% {
        opacity: 1;
    }
    100% {
        bottom: 110%;
        opacity: 0;
        transform: translateX(50px) rotate(20deg);
    }
}

/* Responsive */
@media (max-width: 968px) {
    .info-section {
        grid-template-columns: 1fr;
    }

    .options-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 25px;
    }

    h1 {
        font-size: 26px;
    }

    .fan-svg {
        max-width: 300px;
    }

    .question-label {
        font-size: 18px;
    }

    .draggable-option {
        font-size: 24px;
        padding: 20px;
    }

    .drop-zone-container {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 22px;
    }

    .story-text {
        font-size: 16px;
    }

    .fan-svg {
        max-width: 250px;
    }

    .question-label {
        font-size: 16px;
    }

    .options-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .draggable-option {
        font-size: 22px;
        padding: 18px;
    }

    .drop-label, .drop-unit {
        font-size: 20px;
    }

    .drop-value {
        font-size: 28px;
    }

    .feedback {
        font-size: 18px;
    }
}