/* ===== GLOBAL RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* ===== MAIN CONTAINER ===== */
.container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 700px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}

/* ===== HEADER ===== */
h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.subtitle {
    color: #666;
    font-size: 1rem;
    margin-bottom: 25px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 15px;
}

/* ===== STATS DISPLAY ===== */
.stats-display {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: #667eea;
    display: block;
}

.stat-label {
    font-size: 0.85rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== BUTTONS ===== */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1 1 auto;
    min-width: 140px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

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

.btn-secondary {
    background: #e9ecef;
    color: #333;
}

.btn-secondary:hover {
    background: #dee2e6;
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(17, 153, 142, 0.4);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(17, 153, 142, 0.5);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ===== RESULT BOX ===== */
#result {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    min-height: 80px;
    border: 2px dashed #dee2e6;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    color: #333;
    line-height: 1.6;
}

#result.success {
    border-color: #11998e;
    background: #f0fdf4;
}

#result.error {
    border-color: #dc3545;
    background: #fef2f2;
}

#result.loading {
    border-color: #667eea;
    background: #f0f0ff;
}

/* ===== SPINNER ===== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #e9ecef;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== FOOTER ===== */
.footer {
    margin-top: 25px;
    text-align: center;
    color: #999;
    font-size: 0.8rem;
    border-top: 2px solid #f0f0f0;
    padding-top: 15px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
    .container {
        padding: 25px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        min-width: unset;
    }
    
    .stats-display {
        flex-direction: column;
        gap: 10px;
    }
}