/* Base Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: 0.375rem;
    transition: all 0.3s ease;
}

/* Button Sizes */
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border-radius: 0.25rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1.125rem;
    border-radius: 0.5rem;
}

/* Button Variants */
.btn-primary {
    background-color: var(--theme-primary);
    color: white;
    border-color: var(--theme-primary);
}

.btn-primary:hover {
    background-color: var(--theme-primary-dark, #0056b3);
    border-color: var(--theme-primary-dark, #0056b3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    background-color: var(--theme-secondary);
    color: white;
    border-color: var(--theme-secondary);
}

.btn-secondary:hover {
    background-color: var(--theme-secondary-dark, #5a6268);
    border-color: var(--theme-secondary-dark, #5a6268);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Outline Buttons */
.btn-outline-primary {
    background-color: transparent;
    color: var(--theme-primary);
    border-color: var(--theme-primary);
}

.btn-outline-primary:hover {
    background-color: var(--theme-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-outline-secondary {
    background-color: transparent;
    color: var(--theme-secondary);
    border-color: var(--theme-secondary);
}

.btn-outline-secondary:hover {
    background-color: var(--theme-secondary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Button States */
.btn:disabled,
.btn.disabled {
    opacity: 0.65;
    pointer-events: none;
    transform: none !important;
    box-shadow: none !important;
}

/* Loading State */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: calc(50% - 0.5rem);
    left: calc(50% - 0.5rem);
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-top-color: white;
    border-radius: 50%;
    animation: button-loading-spinner 0.75s linear infinite;
}

/* Button with Icon */
.btn-icon {
    padding: 0.625rem;
    border-radius: 50%;
}

.btn-icon i,
.btn-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Button Group */
.btn-group {
    display: inline-flex;
    gap: 0.5rem;
}

@keyframes button-loading-spinner {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}