/* ════════════════════════════════════════════════════════════════════
   Enhanced Button System - Modern & Interactive
   ════════════════════════════════════════════════════════════════════ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    border: 2px solid transparent;
    padding: 12px 24px;
    font-size: 14px;
    line-height: 1.5;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    gap: 8px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn:hover::before {
    transform: translateX(100%);
}

/* Primary Button */
.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    border-color: #2563eb;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
    background: linear-gradient(135deg, #1d4ed8 0%, #4338ca 100%);
}

.btn-primary:active {
    transform: translateY(0) scale(1);
}

/* Secondary Button */
.btn-secondary {
    color: #fff;
    background: linear-gradient(135deg, #64748b 0%, #475569 100%);
    border-color: #64748b;
    box-shadow: 0 4px 15px rgba(100, 116, 139, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(100, 116, 139, 0.4);
    background: linear-gradient(135deg, #475569 0%, #334155 100%);
}

/* Success Button */
.btn-success {
    color: #fff;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: #10b981;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
}

/* Danger Button */
.btn-danger {
    color: #fff;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border-color: #ef4444;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.4);
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
}

/* Outline Buttons */
.btn-outline-primary {
    color: #2563eb;
    background: transparent;
    border-color: #2563eb;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.1);
}

.btn-outline-primary:hover {
    color: #fff;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
}

/* Ghost Button */
.btn-ghost {
    color: #64748b;
    background: rgba(100, 116, 139, 0.1);
    border-color: rgba(100, 116, 139, 0.2);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    color: #475569;
    background: rgba(100, 116, 139, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(100, 116, 139, 0.2);
}

/* Button Sizes */
.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
    border-radius: 8px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
    border-radius: 16px;
}

.btn-xl {
    padding: 20px 40px;
    font-size: 18px;
    border-radius: 20px;
}

/* Loading State */
.btn.loading {
    pointer-events: none;
    opacity: 0.8;
    position: relative;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Disabled State */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .btn {
        padding: 14px 20px;
        font-size: 16px;
        border-radius: 12px;
        width: 100%;
        justify-content: center;
    }
    
    .btn-sm {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .btn-lg {
        padding: 18px 24px;
        font-size: 18px;
    }
}

/* Icon Buttons */
.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon-sm {
    width: 36px;
    height: 36px;
}

.btn-icon-lg {
    width: 60px;
    height: 60px;
}